diff --git a/data/json/overmap/overmap_terrain/overmap_terrain.json b/data/json/overmap/overmap_terrain/overmap_terrain.json
index 086919a1b0efc..88f9580bd3ede 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain.json
@@ -5,6 +5,7 @@
     "name": "nothing",
     "sym": "%",
     "color": "white",
+    "vision_levels": "always_full",
     "flags": [ "NO_ROTATE" ]
   },
   {
@@ -13,6 +14,7 @@
     "name": "Unexplored",
     "sym": "#",
     "color": "dark_gray",
+    "vision_levels": "always_full",
     "flags": [ "NO_ROTATE", "SHOULD_NOT_SPAWN" ]
   },
   {
@@ -22,6 +24,7 @@
     "name": "nether-chewed field",
     "sym": "%",
     "color": "dark_gray",
+    "vision_levels": "always_full",
     "flags": [ "NO_ROTATE", "SHOULD_NOT_SPAWN" ]
   },
   {
@@ -30,6 +33,7 @@
     "name": "city building",
     "sym": "^",
     "see_cost": 5,
+    "vision_levels": "city_building",
     "extras": "build",
     "mondensity": 2,
     "flags": [ "RISK_HIGH", "GENERIC_LOOT" ]
@@ -46,6 +50,7 @@
     "name": "solid earth",
     "sym": "#",
     "color": "brown",
+    "vision_levels": "always_full",
     "see_cost": 5,
     "travel_cost_type": "impassable",
     "flags": [ "NO_ROTATE" ]
@@ -58,6 +63,7 @@
     "looks_like": "empty_rock",
     "sym": "%",
     "color": "dark_gray",
+    "vision_levels": "always_full",
     "see_cost": 5,
     "travel_cost_type": "impassable",
     "flags": [ "NO_ROTATE" ]
@@ -85,6 +91,7 @@
     "name": "boat rental",
     "sym": "#",
     "color": "white",
+    "vision_levels": "isolated_building",
     "see_cost": 5,
     "extras": "build",
     "mondensity": 1,
@@ -96,6 +103,7 @@
     "name": "lighthouse",
     "sym": "0",
     "color": "yellow",
+    "vision_levels": "isolated_tower",
     "see_cost": 5,
     "flags": [ "RISK_LOW", "SOURCE_SAFETY" ]
   },
@@ -105,6 +113,7 @@
     "name": "lighthouse",
     "sym": "0",
     "color": "yellow",
+    "vision_levels": "isolated_tower",
     "see_cost": 5
   },
   {
@@ -114,6 +123,7 @@
     "sym": "&",
     "color": "yellow",
     "see_cost": 5,
+    "vision_levels": "isolated_tower",
     "flags": [ "RISK_LOW", "SOURCE_SAFETY" ]
   },
   {
@@ -123,6 +133,7 @@
     "sym": "0",
     "color": "yellow",
     "see_cost": 5,
+    "vision_levels": "isolated_tower",
     "flags": [ "RISK_LOW", "SOURCE_SAFETY" ]
   },
   {
@@ -131,12 +142,14 @@
     "name": "small lighthouse",
     "sym": "0",
     "color": "yellow",
+    "vision_levels": "isolated_tower",
     "see_cost": 5
   },
   {
     "type": "overmap_terrain",
     "id": "island_sand",
     "name": "island",
+    "vision_levels": "island",
     "sym": ".",
     "color": "yellow",
     "see_cost": 1
@@ -146,6 +159,7 @@
     "id": [ "island_forest", "island_forest_thick" ],
     "name": "island",
     "sym": "F",
+    "vision_levels": "island",
     "color": "green",
     "looks_like": "forest",
     "see_cost": 1
@@ -155,6 +169,7 @@
     "id": "island_forest_water",
     "name": "island",
     "sym": "F",
+    "vision_levels": "island",
     "color": "cyan",
     "looks_like": "forest_water",
     "see_cost": 1
@@ -163,6 +178,7 @@
     "type": "overmap_terrain",
     "id": "island_field",
     "name": "island",
+    "vision_levels": "island",
     "sym": ".",
     "color": "brown",
     "looks_like": "field",
@@ -172,6 +188,7 @@
     "type": "overmap_terrain",
     "id": "cabin_isherwood",
     "name": "cabin",
+    "vision_levels": "isolated_building",
     "sym": "C",
     "color": "i_green",
     "see_cost": 5
@@ -189,6 +206,7 @@
       "riverside_dwelling3_roof"
     ],
     "name": "riverside dwelling",
+    "vision_levels": "isolated_building",
     "sym": "+",
     "color": "i_yellow",
     "see_cost": 5,
@@ -199,6 +217,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "cabin_lake", "lake_cabin_boathouse", "cabin_strange" ],
+    "vision_levels": "isolated_building",
     "name": "cabin",
     "sym": "C",
     "color": "i_green",
@@ -208,6 +227,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "lake_cabin_water" ],
+    "vision_levels": "water_body",
     "name": "lake",
     "sym": "#",
     "color": "blue",
@@ -216,6 +236,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "cabin_lake_roof", "lake_cabin_boathouse_roof" ],
+    "vision_levels": "roof_or_air",
     "name": "cabin roof",
     "sym": "C",
     "color": "i_green",
@@ -224,6 +245,7 @@
   {
     "type": "overmap_terrain",
     "id": "cabin_strange_b",
+    "vision_levels": "underground_dirt",
     "name": "cabin basement",
     "sym": "C",
     "color": "i_green",
@@ -233,6 +255,7 @@
   {
     "type": "overmap_terrain",
     "id": "cabin_strange_roof",
+    "vision_levels": "roof_or_air",
     "name": "cabin roof",
     "sym": "C",
     "color": "i_green",
@@ -256,6 +279,7 @@
     "name": "cabin",
     "sym": "C",
     "color": "i_green",
+    "vision_levels": "isolated_building",
     "see_cost": 5,
     "extras": "build",
     "mondensity": 2,
@@ -265,6 +289,7 @@
     "type": "overmap_terrain",
     "id": [ "cabin_liam" ],
     "name": "cabin",
+    "vision_levels": "isolated_building",
     "sym": "C",
     "color": "i_green",
     "see_cost": 5,
@@ -286,6 +311,7 @@
       "cabin_roof_lapin",
       "bandit_cabin_roof"
     ],
+    "vision_levels": "roof_or_air",
     "name": "cabin roof",
     "sym": "C",
     "color": "i_green",
@@ -316,6 +342,7 @@
     "id": [ "lodge_ground1", "lodge_ground2" ],
     "name": "hunting lodge",
     "sym": "L",
+    "vision_levels": "isolated_building",
     "copy-from": "generic_forest",
     "color": "light_green",
     "see_cost": 4,
@@ -326,6 +353,7 @@
     "id": [ "lodge_ground_glooscap1", "lodge_ground_glooscap2" ],
     "name": "hunting lodge",
     "sym": "L",
+    "vision_levels": "isolated_building",
     "copy-from": "generic_forest",
     "color": "light_green",
     "see_cost": 4,
@@ -335,6 +363,7 @@
     "type": "overmap_terrain",
     "id": [ "lodge_2ndfloor1", "lodge_2ndfloor2" ],
     "name": "second floor hunting lodge",
+    "vision_levels": "isolated_building",
     "copy-from": "generic_forest",
     "sym": "L",
     "see_cost": 4,
@@ -344,6 +373,7 @@
     "type": "overmap_terrain",
     "id": [ "lodge_roof1", "lodge_roof2" ],
     "name": "hunting lodge roof",
+    "vision_levels": "roof_or_air",
     "copy-from": "generic_forest",
     "sym": "L",
     "see_cost": 4,
@@ -358,6 +388,7 @@
       "lodge_basement_residential4"
     ],
     "name": "hunting lodge basement",
+    "vision_levels": "underground_dirt",
     "copy-from": "generic_forest",
     "sym": "L",
     "see_cost": 4,
@@ -373,6 +404,7 @@
     "type": "overmap_terrain",
     "id": "dirtroad1_aban1",
     "name": "forest",
+    "vision_levels": "forested",
     "sym": "F",
     "color": "green",
     "see_cost": 4
@@ -380,6 +412,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "forest_aban1", "dirtroad2_aban1", "dirtplaza_aban1" ],
+    "vision_levels": "forested",
     "name": "forest",
     "sym": "F",
     "color": "green",
@@ -388,6 +421,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "cabin_aban1", "cabin_aban1_roof" ],
+    "vision_levels": "forested",
     "name": "ruined cabin",
     "sym": "F",
     "color": "green",
@@ -397,6 +431,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "barn_aban1", "barn_aban1_roof" ],
+    "vision_levels": "forested",
     "name": "barn",
     "sym": "F",
     "color": "green",
@@ -406,6 +441,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "car_corner_aban1", "car_corner_aban1_roof" ],
+    "vision_levels": "forested",
     "name": "car corner",
     "sym": "F",
     "color": "green",
@@ -414,6 +450,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "shipwreck_river_1", "shipwreck_river_2", "shipwreck_river_3", "shipwreck_river_4" ],
+    "vision_levels": "wreckage",
     "name": "shipwreck",
     "sym": "w",
     "color": "red",
@@ -422,6 +459,7 @@
   },
   {
     "type": "overmap_terrain",
+    "vision_levels": "natural_depression",
     "id": "crater",
     "name": "crater",
     "sym": "o",
@@ -446,6 +484,7 @@
       "radio_tower_1",
       "radio_tower_roof_1"
     ],
+    "vision_levels": "isolated_tower",
     "name": "radio tower",
     "sym": "X",
     "color": "light_gray",
@@ -463,6 +502,7 @@
       "wasp_tower_even_2",
       "wasp_tower_top"
     ],
+    "vision_levels": "isolated_tower",
     "name": "radio tower",
     "sym": "X",
     "color": "light_gray",
@@ -473,6 +513,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "wind_turbine_ground", "wind_turbine_pillar", "wind_turbine_pillar_platform", "wind_turbine_roof" ],
+    "vision_levels": "isolated_tower",
     "name": "wind turbine",
     "sym": "o",
     "color": "light_gray"
@@ -480,6 +521,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "wind_turbine_nacelle" ],
+    "vision_levels": "isolated_tower",
     "name": "wind turbine",
     "sym": "Y",
     "color": "white"
@@ -496,6 +538,7 @@
       "bandit_camp_3_roof",
       "bandit_camp_4_roof"
     ],
+    "vision_levels": "isolated_building",
     "name": "wooden fort",
     "sym": "+",
     "color": "brown",
@@ -518,6 +561,7 @@
       "bandit_farm_8",
       "bandit_farm_7"
     ],
+    "vision_levels": "isolated_building",
     "name": "farm",
     "sym": "#",
     "color": "brown",
@@ -581,6 +625,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "campsite", "campsite_a" ],
+    "vision_levels": "blends_till_details",
     "name": "campsite",
     "sym": "+",
     "color": "green",
@@ -592,6 +637,7 @@
     "type": "overmap_terrain",
     "id": "campsite_cabin_incomplete",
     "name": "incomplete cabin",
+    "vision_levels": "isolated_building",
     "sym": "+",
     "color": "light_green",
     "see_cost": 5,
@@ -601,6 +647,7 @@
   {
     "type": "overmap_terrain",
     "id": "campsite_cabin_incomplete_roof",
+    "vision_levels": "roof_or_air",
     "name": "incomplete cabin roof",
     "sym": "+",
     "color": "light_green",
@@ -610,6 +657,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "campsite_field_biker", "campsite_field_biker_destroyed" ],
+    "vision_levels": "blends_till_details",
     "name": "field campsite",
     "sym": "+",
     "color": "light_green",
@@ -621,6 +669,7 @@
     "type": "overmap_terrain",
     "id": "pond_field",
     "name": "pond",
+    "vision_levels": "single_water",
     "sym": ".",
     "color": "blue",
     "see_cost": 5,
@@ -630,6 +679,7 @@
     "type": "overmap_terrain",
     "id": "hot_springs",
     "name": "hot spring",
+    "vision_levels": "single_water",
     "sym": ".",
     "color": "light_blue",
     "see_cost": 5,
@@ -638,6 +688,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "hunter_shack", "hunter_shack_1" ],
+    "vision_levels": "isolated_building",
     "name": "swamp shack",
     "sym": "+",
     "color": "i_cyan",
@@ -648,6 +699,7 @@
     "type": "overmap_terrain",
     "id": [ "survivor_forest_camp" ],
     "name": "survivor forest camp",
+    "vision_levels": "blends_till_details",
     "sym": "+",
     "color": "green",
     "see_cost": 5,
@@ -656,6 +708,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "hunter_shack_roof", "hunter_shack_roof_1" ],
+    "vision_levels": "roof_or_air",
     "name": "swamp shack roof",
     "sym": "+",
     "color": "i_cyan",
@@ -664,6 +717,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "drug_lab", "bandit_drug_lab" ],
+    "vision_levels": "isolated_building",
     "name": "drug lab",
     "sym": "^",
     "color": "brown",
@@ -672,6 +726,7 @@
   {
     "type": "overmap_terrain",
     "id": "drug_lab_roof",
+    "vision_levels": "roof_or_air",
     "name": "drug lab roof",
     "sym": "^",
     "color": "brown",
@@ -681,6 +736,7 @@
     "type": "overmap_terrain",
     "id": [ "campground_1a", "campground_1b", "campground_2a", "campground_2b" ],
     "name": "campground",
+    "vision_levels": "blends_till_details",
     "sym": "+",
     "color": "i_green",
     "see_cost": 5,
@@ -690,6 +746,7 @@
   {
     "type": "overmap_terrain",
     "id": "campground_roof",
+    "vision_levels": "roof_or_air",
     "name": "campground roof",
     "sym": "+",
     "color": "i_green",
@@ -700,6 +757,7 @@
     "type": "overmap_terrain",
     "id": [ "godco_1", "godco_2", "godco_3", "godco_4", "godco_5", "godco_6", "godco_7", "godco_8", "godco_9" ],
     "name": "church retreat",
+    "vision_levels": "isolated_building",
     "sym": "+",
     "color": "i_green",
     "see_cost": 5,
@@ -721,6 +779,7 @@
       "godco_2_2",
       "godco_1_3"
     ],
+    "vision_levels": "isolated_building",
     "name": "church retreat roof",
     "sym": "+",
     "color": "i_green",
@@ -730,6 +789,7 @@
     "type": "overmap_terrain",
     "id": "desolatebarn",
     "copy-from": "generic_city_building_no_sidewalk",
+    "vision_levels": "isolated_building",
     "name": "desolate barn",
     "sym": "B",
     "color": "brown",
@@ -738,6 +798,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "bandit_garage_1", "bandit_garage_2", "bandit_garage_1_roof", "bandit_garage_2_roof" ],
+    "vision_levels": "isolated_building",
     "name": "garage",
     "sym": "O",
     "color": "white",
@@ -747,6 +808,7 @@
   {
     "type": "overmap_terrain",
     "abstract": "generic_giant_sinkhole",
+    "vision_levels": "natural_depression",
     "sym": "O",
     "color": "brown",
     "flags": [ "REQUIRES_PREDECESSOR" ]
@@ -783,6 +845,7 @@
       "irradiator_1_7",
       "irradiator_1_9"
     ],
+    "vision_levels": "large_building",
     "name": "irradiation plant",
     "sym": "i",
     "color": "light_green",
@@ -791,6 +854,7 @@
   {
     "type": "overmap_terrain",
     "id": "irradiator_1_8",
+    "vision_levels": "large_building",
     "name": "irradiation plant",
     "sym": "I",
     "color": "light_green",
@@ -810,6 +874,7 @@
       "irradiator_1_9_roof"
     ],
     "name": "irradiation plant",
+    "vision_levels": "roof_or_air",
     "sym": "i",
     "color": "light_green",
     "see_cost": 5
@@ -817,6 +882,7 @@
   {
     "type": "overmap_terrain",
     "id": "irradiator_1_8_roof",
+    "vision_levels": "roof_or_air",
     "name": "irradiation plant",
     "sym": "I",
     "color": "light_green",
@@ -846,6 +912,7 @@
     "name": "field",
     "sym": ".",
     "color": "brown",
+    "vision_levels": "open_land",
     "see_cost": 1
   },
   {
@@ -861,6 +928,7 @@
       "airliner_2c_-1"
     ],
     "name": "crashed airliner",
+    "vision_levels": "wreckage",
     "sym": "A",
     "color": "red",
     "see_cost": 5
@@ -868,6 +936,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "airliner_1b", "airliner_3c" ],
+    "vision_levels": "wreckage",
     "name": "wreckage",
     "sym": "A",
     "color": "light_gray",
@@ -888,11 +957,13 @@
     "name": "crash trail",
     "sym": ",",
     "color": "brown",
+    "vision_levels": "open_land",
     "see_cost": 2
   },
   {
     "type": "overmap_terrain",
     "id": [ "wasp_tower_roof" ],
+    "vision_levels": "roof_or_air",
     "name": "open air",
     "sym": ".",
     "color": "blue",
@@ -902,6 +973,7 @@
     "type": "overmap_terrain",
     "id": "lab_subway_vent_shaft-1",
     "name": "ventilation shaft",
+    "vision_levels": "underground_dirt",
     "sym": "#",
     "color": "brown",
     "see_cost": 5,
@@ -910,6 +982,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "lab_subway_vent_shaft-2", "lab_subway_vent_shaft-3", "lab_subway_vent_shaft-4" ],
+    "vision_levels": "underground_stone",
     "name": "ventilation shaft",
     "sym": "%",
     "color": "dark_gray",
@@ -919,6 +992,7 @@
   {
     "type": "overmap_terrain",
     "abstract": "generic_bastion_fort",
+    "vision_levels": "large_building",
     "name": "bastion fort",
     "sym": "F",
     "color": "red"
@@ -965,6 +1039,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "nest_dermatik", "nest_dermatik_roof" ],
+    "vision_levels": "natural_outcropping",
     "name": "mound of dirt",
     "sym": "O",
     "color": "brown",
@@ -974,6 +1049,7 @@
     "type": "overmap_terrain",
     "id": "rock_border",
     "name": "rock border",
+    "vision_levels": "always_full",
     "sym": "#",
     "color": "white",
     "flags": [ "NO_ROTATE" ],
@@ -983,6 +1059,7 @@
     "type": "overmap_terrain",
     "id": "spider_pit",
     "name": "spider pit",
+    "vision_levels": "blends_till_details",
     "sym": "S",
     "color": "white",
     "see_cost": 3,
@@ -991,6 +1068,7 @@
   {
     "type": "overmap_terrain",
     "id": "spider_pit_under",
+    "vision_levels": "underground_dirt",
     "name": "cavern",
     "looks_like": "cave_underground",
     "sym": "0",
@@ -1000,6 +1078,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "chemical_lab_ocu", "chemical_lab_roof_ocu" ],
+    "vision_levels": "isolated_building",
     "name": "small cabin",
     "sym": "C",
     "color": "i_green",
@@ -1008,6 +1087,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "smallscrapyard_ocu" ],
+    "vision_levels": "isolated_building",
     "name": "scrap yard",
     "sym": "s",
     "color": "red"
@@ -1015,6 +1095,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "smallscrapyard_ocu_roof" ],
+    "vision_levels": "roof_or_air",
     "name": "scrap yard roof",
     "sym": "s",
     "color": "red"
@@ -1022,6 +1103,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "lumbermill_0_0_ocu", "lumbermill_0_1_ocu", "lumbermill_1_0_ocu", "lumbermill_1_1_ocu" ],
+    "vision_levels": "isolated_building",
     "name": "lumbermill",
     "sym": "L",
     "color": "i_green",
@@ -1049,6 +1131,7 @@
       "hive_edge_12_roof",
       "hive_edge_22_roof"
     ],
+    "vision_levels": "unusual_structure",
     "name": "bee hive",
     "sym": "8",
     "color": "yellow",
@@ -1059,6 +1142,7 @@
     "type": "overmap_terrain",
     "id": "field_graboid",
     "looks_like": "field",
+    "vision_levels": "open_land",
     "name": "field",
     "sym": ".",
     "color": "brown",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_LIXA.json b/data/json/overmap/overmap_terrain/overmap_terrain_LIXA.json
index 31c9b01f57eba..21982a1668ba2 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_LIXA.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_LIXA.json
@@ -3,6 +3,7 @@
     "type": "overmap_terrain",
     "id": [ "LIXA_surface_1a", "LIXA_surface_2a", "LIXA_surface_1b", "LIXA_surface_2b" ],
     "name": "research facility",
+    "vision_levels": "large_building",
     "sym": "l",
     "color": "light_gray",
     "see_cost": 5
@@ -10,6 +11,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "LIXA_roof_1a", "LIXA_roof_2a", "LIXA_roof_1b", "LIXA_roof_2b" ],
+    "vision_levels": "roof_or_air",
     "name": "research facility roof",
     "sym": "l",
     "color": "light_gray",
@@ -19,6 +21,7 @@
     "type": "overmap_terrain",
     "id": [ "LIXA_entry_1", "LIXA_entry_2" ],
     "name": "research facility gate",
+    "vision_levels": "large_building",
     "sym": "l",
     "color": "light_gray",
     "see_cost": 5
@@ -26,6 +29,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "LIXA_road" ],
+    "copy-from": "road_abstract",
     "name": "research facility access road",
     "sym": "l",
     "color": "light_gray",
@@ -35,6 +39,7 @@
     "type": "overmap_terrain",
     "id": [ "LIXA_road_guard", "LIXA_road_guard_roof" ],
     "name": "research facility checkpoint",
+    "vision_levels": "large_building",
     "sym": "l",
     "color": "light_gray",
     "see_cost": 5
@@ -52,6 +57,7 @@
       "LIXA_stairshaft_2d"
     ],
     "name": "LIXA experiment floor access",
+    "vision_levels": "underground_stone",
     "sym": "l",
     "color": "light_gray",
     "see_cost": 5
@@ -59,6 +65,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "LIXA_workfloor_1a", "LIXA_workfloor_2a", "LIXA_workfloor_1b", "LIXA_workfloor_2b" ],
+    "vision_levels": "underground_stone",
     "name": "LIXA research floor",
     "sym": "L",
     "color": "light_blue",
@@ -68,6 +75,7 @@
     "type": "overmap_terrain",
     "id": [ "LIXA_device_1", "LIXA_device_2", "LIXA_device_3", "LIXA_device_2_roof", "LIXA_device_3_roof" ],
     "name": "LIXA device floor",
+    "vision_levels": "underground_stone",
     "sym": "L",
     "color": "light_blue",
     "see_cost": 5
@@ -75,6 +83,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "LIXA_device_unfolded_A", "LIXA_device_unfolded_B", "LIXA_device_unfolded_noaccess" ],
+    "vision_levels": "underground_stone",
     "name": "unfolded space",
     "sym": "!",
     "color": "white",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_abstract.json b/data/json/overmap/overmap_terrain/overmap_terrain_abstract.json
index 3dc7ed33080e8..81226bde738a3 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_abstract.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_abstract.json
@@ -2,12 +2,14 @@
   {
     "type": "overmap_terrain",
     "abstract": "generic_cropland",
+    "vision_levels": "open_land",
     "name": "generic_cropland",
     "land_use_code": "cropland"
   },
   {
     "type": "overmap_terrain",
     "abstract": "generic_pasture",
+    "vision_levels": "open_land",
     "name": "generic_pasture",
     "land_use_code": "pasture"
   },
@@ -15,12 +17,14 @@
     "type": "overmap_terrain",
     "abstract": "generic_forest",
     "name": "generic_forest",
+    "vision_levels": "forested",
     "land_use_code": "forest",
     "connect_group": "forest"
   },
   {
     "type": "overmap_terrain",
     "abstract": "generic_wetland",
+    "vision_levels": "forested_swampy",
     "name": "generic_wetland",
     "land_use_code": "wetland"
   },
@@ -33,6 +37,7 @@
   {
     "type": "overmap_terrain",
     "abstract": "generic_open_land",
+    "vision_levels": "open_land",
     "name": "generic_open_land",
     "land_use_code": "open_land"
   },
@@ -99,12 +104,14 @@
   {
     "type": "overmap_terrain",
     "abstract": "generic_transitional",
+    "vision_levels": "blends_till_details",
     "name": "generic_transitional",
     "land_use_code": "transitional"
   },
   {
     "type": "overmap_terrain",
     "abstract": "generic_transportation",
+    "vision_levels": "blends_till_outlines",
     "name": "generic_transportation",
     "land_use_code": "transportation"
   },
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_agricultural.json b/data/json/overmap/overmap_terrain/overmap_terrain_agricultural.json
index 6cd8b2c754532..ed1accf76fbb1 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_agricultural.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_agricultural.json
@@ -4,6 +4,7 @@
     "abstract": "generic_rural_road",
     "name": "rural road",
     "color": "brown",
+    "vision_levels": "blends_till_details",
     "travel_cost_type": "dirt_road",
     "see_cost": 2,
     "mondensity": 2,
@@ -28,6 +29,7 @@
     "name": "rural building",
     "sym": "#",
     "color": "i_brown",
+    "vision_levels": "isolated_building",
     "delete": { "flags": [ "RISK_HIGH" ] },
     "extend": { "flags": [ "SOURCE_FOOD", "SOURCE_SAFETY", "RISK_LOW", "SOURCE_FARMING" ] }
   },
@@ -91,6 +93,7 @@
       "farm_9"
     ],
     "copy-from": "generic_rural_building",
+    "vision_levels": "farm_field",
     "name": "farm field"
   },
   {
@@ -138,6 +141,7 @@
     ],
     "copy-from": "generic_rural_building",
     "name": "farm field",
+    "vision_levels": "farm_field",
     "see_cost": 2,
     "extras": "agricultural",
     "looks_like": "farm_5",
@@ -149,6 +153,7 @@
     "copy-from": "generic_rural_building",
     "name": "hay field",
     "color": "brown",
+    "vision_levels": "farm_field",
     "see_cost": 2,
     "extras": "agricultural",
     "looks_like": "ranch_camp_76",
@@ -248,6 +253,7 @@
     "id": "farm_stills_11",
     "copy-from": "generic_rural_building",
     "name": "orchard",
+    "vision_levels": "isolated_building",
     "spawns": { "group": "GROUP_WASP_FORAGER", "population": [ 1, 4 ], "chance": 10 },
     "color": "brown"
   },
@@ -258,6 +264,7 @@
     "name": "apple orchard",
     "sym": "T",
     "color": "light_green",
+    "vision_levels": "first_glance_forest",
     "looks_like": "forest",
     "spawns": { "group": "GROUP_WASP_FORAGER", "population": [ 1, 4 ], "chance": 5 },
     "mondensity": 3
@@ -269,6 +276,7 @@
     "name": "orchard processing",
     "sym": "T",
     "color": "i_light_green",
+    "vision_levels": "isolated_building",
     "mondensity": 3
   },
   {
@@ -278,6 +286,7 @@
     "name": "orchard stall",
     "sym": "T",
     "color": "i_light_green",
+    "vision_levels": "isolated_building",
     "mondensity": 3
   },
   {
@@ -524,6 +533,7 @@
     "id": [ "forest_trail_intersection" ],
     "copy-from": "generic_rural_building",
     "name": "forest trail",
+    "vision_levels": "forested",
     "sym": "O",
     "color": "green"
   },
@@ -531,6 +541,7 @@
     "type": "overmap_terrain",
     "id": [ "moonshine_still", "moonshine_still_1", "moonshine_still_2" ],
     "copy-from": "generic_rural_building",
+    "vision_levels": "blends_till_details",
     "name": "moonshine still",
     "sym": "S"
   },
@@ -545,6 +556,7 @@
     "type": "overmap_terrain",
     "id": "TreeFarm_1b",
     "copy-from": "generic_rural_building",
+    "vision_levels": "forested",
     "name": "tree farm",
     "sym": "T",
     "spawns": { "group": "GROUP_WASP_FORAGER", "population": [ 1, 2 ], "chance": 20 },
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_aircraft_carrier.json b/data/json/overmap/overmap_terrain/overmap_terrain_aircraft_carrier.json
index a2b9f7a6156cd..79c78473cdc7d 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_aircraft_carrier.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_aircraft_carrier.json
@@ -124,6 +124,7 @@
       "aircraft_carrier_1a_4",
       "aircraft_carrier_2a_4"
     ],
+    "vision_levels": "large_ship",
     "name": "aircraft carrier",
     "sym": "A",
     "color": "red",
@@ -174,6 +175,7 @@
       "aircraft_carrier_13b_-1",
       "aircraft_carrier_13c_-1"
     ],
+    "vision_levels": "large_ship",
     "name": "aircraft carrier",
     "sym": "A",
     "color": "red",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_alien.json b/data/json/overmap/overmap_terrain/overmap_terrain_alien.json
index ff1496005b000..09e2426387aef 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_alien.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_alien.json
@@ -2,6 +2,7 @@
   {
     "type": "overmap_terrain",
     "id": "exo_safehouse_stone_0",
+    "vision_levels": "isolated_building",
     "name": "unusual stone barn",
     "sym": "^",
     "color": "brown",
@@ -11,24 +12,21 @@
   {
     "type": "overmap_terrain",
     "id": "exo_safehouse_stone_1",
-    "name": "unusual stone barn",
-    "sym": "^",
-    "color": "brown",
-    "see_cost": 2,
+    "copy-from": "exo_safehouse_stone_0",
     "flags": [ "KNOWN_UP", "KNOWN_DOWN" ]
   },
   {
     "type": "overmap_terrain",
     "id": "exo_safehouse_stone_2",
+    "vision_levels": "roof_or_air",
     "name": "unusual stone barn roof",
-    "sym": "^",
-    "color": "brown",
-    "see_cost": 2,
+    "copy-from": "exo_safehouse_stone_0",
     "flags": [ "KNOWN_DOWN" ]
   },
   {
     "type": "overmap_terrain",
     "id": "exo_warehouse_1",
+    "vision_levels": "isolated_building",
     "name": "strange warehouse",
     "sym": "#",
     "color": "light_gray",
@@ -38,15 +36,13 @@
   {
     "type": "overmap_terrain",
     "id": "exo_warehouse_2",
-    "name": "strange warehouse",
-    "sym": "#",
-    "color": "light_gray",
-    "see_cost": 2,
+    "copy-from": "exo_warehouse_1",
     "flags": [ "KNOWN_DOWN" ]
   },
   {
     "type": "overmap_terrain",
     "id": [ "slimepit_bottom" ],
+    "vision_levels": "underground_dirt",
     "name": "slime pit",
     "sym": "~",
     "color": "light_green",
@@ -57,11 +53,13 @@
     "type": "overmap_terrain",
     "id": [ "slimepit_top" ],
     "copy-from": "slimepit_bottom",
+    "vision_levels": "natural_depression",
     "flags": [ "KNOWN_DOWN", "NO_ROTATE", "REQUIRES_PREDECESSOR" ]
   },
   {
     "type": "overmap_terrain",
     "id": "exodii_base_x0y0z0",
+    "vision_levels": "large_outcropping",
     "name": "rocky butte",
     "sym": "%",
     "color": "light_gray",
@@ -71,6 +69,7 @@
   {
     "type": "overmap_terrain",
     "id": "exodii_base_x0y3z0",
+    "vision_levels": "large_outcropping",
     "name": "ground-level entrance",
     "sym": "?",
     "color": "white",
@@ -100,6 +99,7 @@
   {
     "type": "overmap_terrain",
     "id": "exodii_base_x0y0z1",
+    "vision_levels": "large_outcropping",
     "name": "scrap metal encampment",
     "sym": "%",
     "color": "light_gray",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_ants.json b/data/json/overmap/overmap_terrain/overmap_terrain_ants.json
index 4dcc19cbd341c..277b75df3c22c 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_ants.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_ants.json
@@ -3,6 +3,7 @@
     "type": "overmap_terrain",
     "id": "anthill",
     "name": "anthill",
+    "vision_levels": "natural_outcropping",
     "sym": "%",
     "color": "brown",
     "see_cost": 2,
@@ -11,6 +12,7 @@
   {
     "type": "overmap_terrain",
     "id": "ants_food",
+    "vision_levels": "underground_dirt",
     "name": "ant food storage",
     "sym": "O",
     "color": "green",
@@ -20,6 +22,7 @@
   {
     "type": "overmap_terrain",
     "id": "acid_ants_food",
+    "vision_levels": "underground_dirt",
     "name": "ant food storage",
     "sym": "O",
     "color": "green",
@@ -71,6 +74,7 @@
   {
     "type": "overmap_terrain",
     "id": "ants",
+    "vision_levels": "underground_dirt",
     "name": "ant tunnel",
     "color": "brown",
     "see_cost": 5,
@@ -80,6 +84,7 @@
   {
     "type": "overmap_terrain",
     "id": "acid_ants",
+    "vision_levels": "underground_dirt",
     "name": "ant tunnel",
     "color": "brown",
     "see_cost": 5,
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_campus.json b/data/json/overmap/overmap_terrain/overmap_terrain_campus.json
index 251331a34d55a..69fc6cdfe501e 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_campus.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_campus.json
@@ -15,6 +15,7 @@
       "campus_admin_0_1_3",
       "campus_admin_0_2_3"
     ],
+    "vision_levels": "large_building",
     "name": "campus admin building",
     "sym": "A",
     "color": "red",
@@ -49,6 +50,7 @@
       "campus_commons_0_3_2",
       "campus_commons_1_3_2"
     ],
+    "vision_levels": "large_building",
     "name": "campus commons building",
     "sym": "C",
     "color": "light_blue",
@@ -67,6 +69,7 @@
       "campus_commons_0_3_3",
       "campus_commons_1_3_3"
     ],
+    "vision_levels": "roof_or_air",
     "name": "campus commons roof",
     "color": "blue",
     "copy-from": "campus_commons_0_0_0"
@@ -91,6 +94,7 @@
       "campus_media_1_0_3",
       "campus_media_1_1_3"
     ],
+    "vision_levels": "large_building",
     "name": "campus media building",
     "sym": "C",
     "color": "light_blue",
@@ -101,6 +105,7 @@
     "type": "overmap_terrain",
     "id": [ "campus_media_0_0_4", "campus_media_0_1_4", "campus_media_1_0_4", "campus_media_1_1_4" ],
     "name": "campus media building roof",
+    "vision_levels": "roof_or_air",
     "color": "blue",
     "copy-from": "campus_media_0_0_0"
   },
@@ -117,6 +122,7 @@
       "campus_health_0_1_2",
       "campus_health_0_2_2"
     ],
+    "vision_levels": "large_building",
     "name": "campus health building",
     "sym": "C",
     "color": "red",
@@ -126,6 +132,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "campus_health_0_0_3", "campus_health_0_1_3", "campus_health_0_2_3" ],
+    "vision_levels": "roof_or_air",
     "name": "campus health building roof",
     "copy-from": "campus_health_0_0_0"
   },
@@ -146,6 +153,7 @@
       "campus_lecture_0_3_2"
     ],
     "name": "campus lecture hall",
+    "vision_levels": "large_building",
     "sym": "C",
     "color": "light_blue",
     "see_cost": 5,
@@ -155,6 +163,7 @@
     "type": "overmap_terrain",
     "id": [ "campus_lecture_0_0_3", "campus_lecture_0_1_3", "campus_lecture_0_2_3", "campus_lecture_0_3_3" ],
     "name": "campus lecture hall roof",
+    "vision_levels": "roof_or_air",
     "color": "blue",
     "copy-from": "campus_lecture_0_0_0"
   },
@@ -182,6 +191,7 @@
       "pedestrian_12_9_0",
       "pedestrian_13_9_0"
     ],
+    "vision_levels": "blends_till_details",
     "name": "campus pedestrian area",
     "sym": ".",
     "color": "light_green",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_commercial.json b/data/json/overmap/overmap_terrain/overmap_terrain_commercial.json
index aa0f7db72f9e6..55ae43a705cda 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_commercial.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_commercial.json
@@ -92,6 +92,7 @@
     "type": "overmap_terrain",
     "id": [ "office_tower_ne" ],
     "copy-from": "generic_city_building",
+    "vision_levels": "large_city_building",
     "name": "office building",
     "sym": "T",
     "color": "i_light_gray"
@@ -111,6 +112,7 @@
       "office_tower_underground_se"
     ],
     "copy-from": "generic_city_building_no_sidewalk",
+    "vision_levels": "large_pavement",
     "name": "office building parking",
     "sym": "p",
     "color": "i_light_gray"
@@ -126,6 +128,7 @@
       "office_tower_roof_se_roof"
     ],
     "copy-from": "generic_city_building_no_sidewalk",
+    "vision_levels": "roof_or_air",
     "name": "office building roof",
     "sym": "t",
     "color": "i_light_gray"
@@ -159,6 +162,7 @@
       "office_tower_2_a1_tower_lab"
     ],
     "name": "office tower",
+    "vision_levels": "large_city_building",
     "sym": "t",
     "color": "i_light_gray",
     "see_cost": 5,
@@ -169,6 +173,7 @@
     "type": "overmap_terrain",
     "id": "office_tower_2_a3",
     "name": "office courtyard",
+    "vision_levels": "large_pavement",
     "sym": "O",
     "color": "light_gray",
     "see_cost": 5,
@@ -188,6 +193,7 @@
       "office_tower_collapse_b_b2"
     ],
     "name": "collapsed tower",
+    "vision_levels": "wreckage",
     "sym": "t",
     "color": "i_light_gray",
     "see_cost": 5,
@@ -197,6 +203,7 @@
   {
     "type": "overmap_terrain",
     "id": "office_tower_collapse_a2",
+    "vision_levels": "wreckage",
     "name": "collapsed tower",
     "sym": "O",
     "color": "light_gray",
@@ -208,6 +215,7 @@
     "type": "overmap_terrain",
     "id": "office_tower_collapse_b_a2",
     "name": "collapsed tower",
+    "vision_levels": "wreckage",
     "sym": "t",
     "color": "light_gray",
     "see_cost": 5,
@@ -217,6 +225,7 @@
   {
     "type": "overmap_terrain",
     "id": "office_tower_open_air_corner",
+    "vision_levels": "roof_or_air",
     "name": "open air",
     "sym": ".",
     "color": "blue"
@@ -606,6 +615,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "bank", "bank_1" ],
+    "vision_levels": "city_building",
     "looks_like": "bank",
     "name": "bank",
     "sym": "$",
@@ -617,6 +627,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "bank_roof", "bank_roof_1" ],
+    "vision_levels": "roof_or_air",
     "name": "bank roof",
     "looks_like": "bank_roof",
     "sym": "$",
@@ -722,6 +733,7 @@
       "megastore_2_2_0"
     ],
     "name": "megastore",
+    "vision_levels": "large_city_building",
     "sym": "M",
     "color": "blue",
     "copy-from": "generic_city_building",
@@ -731,6 +743,7 @@
     "type": "overmap_terrain",
     "id": "megastore_1_2_0",
     "name": "megastore",
+    "vision_levels": "large_city_building",
     "sym": "+",
     "color": "light_blue",
     "copy-from": "generic_city_building",
@@ -768,6 +781,7 @@
       "megastore_2_2_1"
     ],
     "name": "megastore, second floor",
+    "vision_levels": "large_city_building",
     "sym": "M",
     "color": "blue",
     "extras": "build",
@@ -786,6 +800,7 @@
       "megastore_2_2_roof"
     ],
     "name": "megastore roof",
+    "vision_levels": "roof_or_air",
     "sym": "M",
     "color": "blue",
     "extras": "build",
@@ -813,6 +828,7 @@
       "hotel_tower_flr4_1_6"
     ],
     "copy-from": "generic_city_building",
+    "vision_levels": "large_pavement",
     "name": "hotel parking",
     "sym": "h",
     "color": "light_blue"
@@ -848,6 +864,7 @@
       "hotel_tower_6_1_9"
     ],
     "copy-from": "generic_city_building",
+    "vision_levels": "large_building",
     "name": "hotel",
     "sym": "h",
     "color": "light_blue"
@@ -856,6 +873,7 @@
     "type": "overmap_terrain",
     "id": [ "hotel_tower_1_5", "hotel_tower_roof_1_5", "hotel_tower_1_5B", "hotel_tower_1_5C" ],
     "copy-from": "generic_city_building",
+    "vision_levels": "isolated_building",
     "name": "hotel entrance",
     "sym": "H",
     "color": "light_blue"
@@ -863,6 +881,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "hotel_tower_b_1", "hotel_tower_b_2", "hotel_tower_b_3" ],
+    "vision_levels": "underground_dirt",
     "copy-from": "generic_city_building_no_sidewalk",
     "name": "hotel basement",
     "sym": "B",
@@ -872,6 +891,7 @@
     "type": "overmap_terrain",
     "abstract": "generic_motel",
     "name": "motel",
+    "vision_levels": "isolated_building",
     "copy-from": "generic_city_building_no_sidewalk",
     "sym": "m",
     "color": "light_blue"
@@ -935,6 +955,7 @@
       "hdwr_large_1_1_0",
       "hdwr_large_1_2_0"
     ],
+    "vision_levels": "large_city_building",
     "name": "home improvement superstore",
     "sym": "H",
     "color": "light_green_yellow",
@@ -952,6 +973,7 @@
       "hdwr_large_1_2_1",
       "hdwr_large_1_1_2"
     ],
+    "vision_levels": "roof_or_air",
     "name": "home improvement superstore roof",
     "sym": "H",
     "color": "light_green_yellow",
@@ -1299,6 +1321,7 @@
   {
     "type": "overmap_terrain",
     "abstract": "generic_large_office_tower",
+    "vision_levels": "large_city_building",
     "name": "office tower",
     "copy-from": "generic_city_building",
     "sym": "T",
@@ -1307,6 +1330,7 @@
   {
     "type": "overmap_terrain",
     "abstract": "generic_office_skyscraper",
+    "vision_levels": "large_city_building",
     "name": "office skyscraper",
     "copy-from": "generic_city_building",
     "sym": "S",
@@ -1316,6 +1340,7 @@
     "type": "overmap_terrain",
     "id": "home_improvement",
     "name": "home improvement store",
+    "vision_levels": "large_city_building",
     "copy-from": "generic_city_building",
     "color": "yellow_green",
     "extend": { "flags": [ "SOURCE_FABRICATION", "SOURCE_CONSTRUCTION" ] }
@@ -1324,6 +1349,7 @@
     "type": "overmap_terrain",
     "id": "home_improvement_roof",
     "name": "home improvement store roof",
+    "vision_levels": "roof_or_air",
     "copy-from": "generic_city_building",
     "color": "yellow_green"
   },
@@ -1354,6 +1380,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "loffice_tower_17", "loffice_tower_18", "loffice_tower_19", "loffice_tower_20" ],
+    "vision_levels": "roof_or_air",
     "name": "open air",
     "sym": ".",
     "color": "blue"
@@ -1393,6 +1420,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "office_skyscraper_17", "office_skyscraper_18", "office_skyscraper_19", "office_skyscraper_20" ],
+    "vision_levels": "roof_or_air",
     "name": "open air",
     "sym": ".",
     "color": "blue"
@@ -1674,6 +1702,7 @@
       "station_radio_1_tower_odd",
       "station_radio_1_tower_top"
     ],
+    "vision_levels": "isolated_tower",
     "name": "radio tower",
     "sym": "X",
     "color": "light_gray",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_deserter_city.json b/data/json/overmap/overmap_terrain/overmap_terrain_deserter_city.json
index 57e889e4c1a17..5d951755df19c 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_deserter_city.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_deserter_city.json
@@ -13,6 +13,7 @@
       "deserter_city_office_3fb",
       "deserter_city_office_roofb"
     ],
+    "vision_levels": "large_city_building",
     "name": "deserter outpost",
     "sym": "D",
     "color": "brown",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_evac_center.json b/data/json/overmap/overmap_terrain/overmap_terrain_evac_center.json
index 0db57912b642a..77e910ca7b644 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_evac_center.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_evac_center.json
@@ -2,6 +2,7 @@
   {
     "type": "overmap_terrain",
     "abstract": "generic_evac_center",
+    "vision_levels": "large_building",
     "name": "refugee center",
     "see_cost": 5,
     "flags": [ "SOURCE_PEOPLE" ]
@@ -9,6 +10,7 @@
   {
     "type": "overmap_terrain",
     "abstract": "generic_fence",
+    "vision_levels": "open_land",
     "name": "fence",
     "color": "light_gray"
   },
@@ -46,6 +48,7 @@
       "evac_center_14_z2"
     ],
     "name": "refugee center roof",
+    "vision_levels": "roof_or_air",
     "sym": "┼",
     "color": "white",
     "see_cost": 2
@@ -56,6 +59,7 @@
     "see_cost": 2,
     "name": "field",
     "looks_like": "field",
+    "vision_levels": "open_land",
     "sym": ",",
     "color": "brown",
     "flags": [ "NO_ROTATE" ]
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_faction_base.json b/data/json/overmap/overmap_terrain/overmap_terrain_faction_base.json
index fc99fd92e9115..9a1ec7001ab70 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_faction_base.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_faction_base.json
@@ -2,6 +2,7 @@
   {
     "type": "overmap_terrain",
     "id": "faction_base_camp_0",
+    "vision_levels": "always_full",
     "name": "camp survey",
     "sym": "+",
     "color": "white",
@@ -256,6 +257,7 @@
   {
     "type": "overmap_terrain",
     "id": "faction_base_mansion_e1",
+    "vision_levels": "always_full",
     "name": "mansion base entrance",
     "sym": "M",
     "color": "white",
@@ -264,6 +266,7 @@
   {
     "type": "overmap_terrain",
     "id": "faction_base_mansion_e2",
+    "vision_levels": "always_full",
     "name": "mansion base entrance",
     "sym": "M",
     "color": "white",
@@ -272,6 +275,7 @@
   {
     "type": "overmap_terrain",
     "id": "faction_base_mansion_t1",
+    "vision_levels": "always_full",
     "name": "mansion base swimming pool",
     "sym": "M",
     "color": "blue",
@@ -280,6 +284,7 @@
   {
     "type": "overmap_terrain",
     "id": "faction_base_mansion_t2",
+    "vision_levels": "always_full",
     "name": "mansion base bedrooms",
     "sym": "M",
     "color": "light_green",
@@ -288,6 +293,7 @@
   {
     "type": "overmap_terrain",
     "id": "faction_base_mansion_t3",
+    "vision_levels": "always_full",
     "name": "mansion base???",
     "sym": "M",
     "color": "white",
@@ -296,6 +302,7 @@
   {
     "type": "overmap_terrain",
     "id": "faction_base_mansion_t4",
+    "vision_levels": "always_full",
     "name": "mansion base kitchen",
     "sym": "M",
     "color": "pink",
@@ -304,6 +311,7 @@
   {
     "type": "overmap_terrain",
     "id": "faction_base_mansion_t5",
+    "vision_levels": "always_full",
     "name": "mansion base library",
     "sym": "M",
     "color": "brown",
@@ -312,6 +320,7 @@
   {
     "type": "overmap_terrain",
     "id": "faction_base_mansion_t6",
+    "vision_levels": "always_full",
     "name": "mansion base bedroom",
     "sym": "M",
     "color": "light_green",
@@ -320,6 +329,7 @@
   {
     "type": "overmap_terrain",
     "id": "faction_base_mansion_t7",
+    "vision_levels": "always_full",
     "name": "mansion base living rooms",
     "sym": "M",
     "color": "green",
@@ -328,6 +338,7 @@
   {
     "type": "overmap_terrain",
     "id": "faction_base_mansion_c1",
+    "vision_levels": "always_full",
     "name": "mansion base swimming pool",
     "sym": "M",
     "color": "blue",
@@ -336,6 +347,7 @@
   {
     "type": "overmap_terrain",
     "id": "faction_base_mansion_c2",
+    "vision_levels": "always_full",
     "name": "mansion base bar",
     "sym": "M",
     "color": "magenta",
@@ -344,6 +356,7 @@
   {
     "type": "overmap_terrain",
     "id": "faction_base_mansion_c3",
+    "vision_levels": "always_full",
     "name": "mansion base living rooms",
     "sym": "M",
     "color": "green",
@@ -352,6 +365,7 @@
   {
     "type": "overmap_terrain",
     "id": "faction_base_mansion_c4",
+    "vision_levels": "always_full",
     "name": "mansion base bedroom",
     "sym": "M",
     "color": "light_green",
@@ -360,6 +374,7 @@
   {
     "type": "overmap_terrain",
     "id": "faction_base_mansion_c5",
+    "vision_levels": "always_full",
     "name": "mansion base kitchen",
     "sym": "M",
     "color": "pink",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_fungal.json b/data/json/overmap/overmap_terrain/overmap_terrain_fungal.json
index 03f4f3d00a5da..126b8d5b86d08 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_fungal.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_fungal.json
@@ -2,6 +2,7 @@
   {
     "type": "overmap_terrain",
     "id": "fungal_tower",
+    "vision_levels": "blends_till_details",
     "name": "fungal tower",
     "sym": "T",
     "color": "yellow",
@@ -12,6 +13,7 @@
   {
     "type": "overmap_terrain",
     "id": "fungal_bloom",
+    "vision_levels": "blends_till_details",
     "name": "fungal bloom",
     "sym": "T",
     "color": "light_gray",
@@ -22,6 +24,7 @@
   {
     "type": "overmap_terrain",
     "id": "fungal_flowers",
+    "vision_levels": "blends_till_details",
     "name": "fungal flowers",
     "sym": "T",
     "color": "cyan",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_hardcoded.json b/data/json/overmap/overmap_terrain/overmap_terrain_hardcoded.json
index 821ad44952fc7..bf6b07ca0ade9 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_hardcoded.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_hardcoded.json
@@ -5,6 +5,7 @@
     "name": "open air",
     "sym": ".",
     "color": "blue",
+    "vision_levels": "roof_or_air",
     "travel_cost_type": "air",
     "flags": [ "NO_ROTATE" ]
   },
@@ -15,6 +16,7 @@
     "name": "field",
     "sym": ".",
     "color": "brown",
+    "vision_levels": "always_full",
     "see_cost": 2,
     "extras": "field",
     "spawns": { "group": "GROUP_FOREST", "population": [ 0, 1 ], "chance": 13 },
@@ -54,6 +56,7 @@
     "name": "swamp",
     "sym": "F",
     "color": "cyan",
+    "vision_levels": "forested_swampy",
     "see_cost": 4,
     "extras": "forest_water",
     "spawns": { "group": "GROUP_SWAMP", "population": [ 2, 6 ], "chance": 50 },
@@ -67,6 +70,7 @@
     "name": "standing stones",
     "sym": "O",
     "color": "dark_gray",
+    "vision_levels": "open_land",
     "see_cost": 3,
     "spawns": { "group": "GROUP_STANDING_STONES", "population": [ 1, 4 ], "chance": 100 },
     "flags": [ "NO_ROTATE" ]
@@ -75,6 +79,8 @@
     "type": "overmap_terrain",
     "id": [ "temple_stairs", "temple_underground_1", "temple_underground_2", "temple_underground_3", "temple_underground_4" ],
     "name": "strange temple",
+    "//": "Wrong, but doesn't really matter, for underground omts",
+    "vision_levels": "open_land",
     "sym": "T",
     "color": "pink",
     "see_cost": 5,
@@ -83,6 +89,7 @@
   {
     "type": "overmap_terrain",
     "id": "temple_finale",
+    "vision_levels": "underground_stone",
     "name": "strange temple",
     "sym": "T",
     "color": "yellow",
@@ -92,6 +99,7 @@
   {
     "type": "overmap_terrain",
     "id": "cave",
+    "vision_levels": "natural_outcropping",
     "name": "cave",
     "sym": "C",
     "color": "brown",
@@ -101,6 +109,7 @@
   {
     "type": "overmap_terrain",
     "id": "cave_underground",
+    "vision_levels": "underground_dirt",
     "name": "cave",
     "sym": "C",
     "color": "brown",
@@ -112,6 +121,7 @@
     "id": "cave_rat_underground",
     "name": "rat cave",
     "looks_like": "cave_underground",
+    "vision_levels": "underground_dirt",
     "sym": "C",
     "color": "brown",
     "see_cost": 2,
@@ -121,6 +131,7 @@
     "type": "overmap_terrain",
     "id": "cave_rat",
     "name": "rat cave",
+    "vision_levels": "natural_outcropping",
     "looks_like": "cave",
     "sym": "C",
     "color": "dark_gray",
@@ -130,6 +141,7 @@
   {
     "type": "overmap_terrain",
     "id": "slimepit",
+    "vision_levels": "underground_stone",
     "name": "slime pit",
     "sym": "~",
     "color": "light_green",
@@ -139,6 +151,7 @@
   {
     "type": "overmap_terrain",
     "id": "slimepit_down",
+    "vision_levels": "underground_stone",
     "name": "slime pit",
     "sym": "~",
     "color": "light_green",
@@ -149,6 +162,7 @@
     "type": "overmap_terrain",
     "id": "rock",
     "//": "This is old rock type replaced by empty_rock/deep_rock, now only used for edges of slimepits",
+    "vision_levels": "always_full",
     "name": "solid rock",
     "looks_like": "empty_rock",
     "sym": "%",
@@ -160,6 +174,7 @@
     "type": "overmap_terrain",
     "id": "empty_rock",
     "name": "solid rock",
+    "vision_levels": "always_full",
     "sym": "%",
     "color": "dark_gray",
     "see_cost": 5,
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_industrial.json b/data/json/overmap/overmap_terrain/overmap_terrain_industrial.json
index a2c4e7ef9a824..baf080f6d3840 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_industrial.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_industrial.json
@@ -3,6 +3,7 @@
     "type": "overmap_terrain",
     "id": [ "public_works_NE", "public_works_NW", "public_works_SE" ],
     "name": "public works",
+    "vision_levels": "city_building",
     "sym": "w",
     "color": "light_gray",
     "see_cost": 5,
@@ -12,16 +13,13 @@
   {
     "type": "overmap_terrain",
     "id": "public_works_SW",
-    "name": "public works",
     "sym": "W",
-    "color": "light_gray",
-    "see_cost": 5,
-    "mondensity": 2,
-    "flags": [ "SIDEWALK", "SOURCE_VEHICLES", "SOURCE_FABRICATION", "SOURCE_CONSTRUCTION" ]
+    "copy-from": "public_works_NE"
   },
   {
     "type": "overmap_terrain",
     "id": [ "public_works_NE_roof", "public_works_NW_roof", "public_works_SE_roof" ],
+    "vision_levels": "roof_or_air",
     "name": "public works roof",
     "sym": "w",
     "color": "light_gray",
@@ -31,11 +29,8 @@
   {
     "type": "overmap_terrain",
     "id": "public_works_SW_roof",
-    "name": "public works roof",
     "sym": "W",
-    "color": "light_gray",
-    "see_cost": 5,
-    "mondensity": 2
+    "copy-from": "public_works_NE_roof"
   },
   {
     "type": "overmap_terrain",
@@ -43,11 +38,13 @@
     "name": "serving area interface",
     "sym": "0",
     "color": "i_magenta",
+    "vision_levels": "isolated_building",
     "see_cost": 5
   },
   {
     "type": "overmap_terrain",
     "id": "solar_farm",
+    "vision_levels": "blends_till_outlines",
     "name": "solar farm",
     "sym": "#",
     "color": "i_yellow",
@@ -59,6 +56,7 @@
     "name": "small power substation",
     "sym": "H",
     "color": "light_cyan",
+    "vision_levels": "isolated_building",
     "see_cost": 5
   },
   {
@@ -67,12 +65,14 @@
     "name": "small power substation roof",
     "sym": "H",
     "color": "light_cyan",
+    "vision_levels": "isolated_building",
     "see_cost": 5
   },
   {
     "type": "overmap_terrain",
     "id": [ "pwr_large_entrance", "pwr_large_2", "pwr_large_3", "pwr_large_4" ],
     "name": "large power substation",
+    "vision_levels": "isolated_building",
     "sym": "H",
     "color": "cyan",
     "see_cost": 5
@@ -81,6 +81,7 @@
     "type": "overmap_terrain",
     "id": [ "pwr_large_entrance_roof", "pwr_large_2_roof" ],
     "name": "large power substation roof",
+    "vision_levels": "roof_or_air",
     "sym": "H",
     "color": "cyan",
     "see_cost": 5
@@ -139,6 +140,7 @@
     "type": "overmap_terrain",
     "id": [ "lumbermill_0_0", "lumbermill_0_1", "lumbermill_1_0", "lumbermill_1_1" ],
     "copy-from": "generic_city_building_no_sidewalk",
+    "vision_levels": "isolated_building",
     "name": "lumbermill",
     "sym": "L",
     "color": "i_green",
@@ -148,6 +150,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "lumbermill_0_0_roof", "lumbermill_0_1_roof", "lumbermill_1_0_roof", "lumbermill_1_1_roof" ],
+    "vision_levels": "roof_or_air",
     "copy-from": "generic_city_building",
     "name": "lumbermill roof",
     "sym": "L",
@@ -156,6 +159,7 @@
   {
     "type": "overmap_terrain",
     "id": "lumbermill_dforest",
+    "vision_levels": "forested",
     "name": "forest",
     "copy-from": "generic_city_building_no_sidewalk",
     "sym": "L",
@@ -280,6 +284,7 @@
       "steel_mill_4_3_3"
     ],
     "copy-from": "generic_city_building_no_sidewalk",
+    "vision_levels": "large_building",
     "name": "steel mill",
     "sym": "S",
     "color": "dark_gray"
@@ -295,6 +300,8 @@
       "steel_mill_rail_2_3"
     ],
     "copy-from": "generic_city_building_no_sidewalk",
+    "vision_levels": "blends_till_outlines",
+    "looks_like": "road",
     "name": "steel mill depot",
     "sym": "│",
     "color": "dark_gray"
@@ -303,11 +310,9 @@
     "type": "overmap_terrain",
     "id": [ "s_lightindustry_road_0", "s_lightindustry_road_1" ],
     "name": "light industry",
+    "copy-from": "road_abstract",
     "sym": "─",
-    "color": "dark_gray",
-    "see_cost": 5,
     "extras": "build",
-    "travel_cost_type": "road",
     "mondensity": 2
   },
   {
@@ -325,6 +330,7 @@
     "name": "light industry",
     "sym": "I",
     "color": "light_blue",
+    "vision_levels": "isolated_building",
     "see_cost": 5,
     "extras": "build",
     "mondensity": 2
@@ -332,6 +338,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "mine_entrance", "mine_entrance_loading_zone" ],
+    "vision_levels": "isolated_building",
     "name": "mine entrance",
     "sym": "M",
     "color": "magenta",
@@ -341,6 +348,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "mine_entrance_roof", "mine_entrance_loading_zone_roof" ],
+    "vision_levels": "roof_or_air",
     "name": "mine entrance roof",
     "sym": "M",
     "color": "magenta",
@@ -349,6 +357,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "mine_shaft_middle", "mine_shaft_middle_east" ],
+    "vision_levels": "underground_stone",
     "name": "mine shaft",
     "sym": "O",
     "color": "dark_gray",
@@ -358,6 +367,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "mine_shaft_lower", "mine_shaft_lower_east" ],
+    "vision_levels": "underground_stone",
     "name": "mine shaft",
     "sym": "O",
     "color": "dark_gray",
@@ -396,6 +406,7 @@
       "mine_wyrms_east",
       "mine_wyrms_finale"
     ],
+    "vision_levels": "underground_stone",
     "name": "mine tunnels",
     "sym": "O",
     "color": "dark_gray",
@@ -405,6 +416,7 @@
   {
     "type": "overmap_terrain",
     "id": "mine_tunnel",
+    "vision_levels": "underground_stone",
     "name": "mine tunnels",
     "color": "dark_gray",
     "see_cost": 5,
@@ -414,6 +426,7 @@
   {
     "type": "overmap_terrain",
     "id": "mine_finale",
+    "vision_levels": "underground_stone",
     "name": "mine",
     "sym": "M",
     "color": "brown",
@@ -423,11 +436,10 @@
     "type": "overmap_terrain",
     "id": [ "s_lightindustry_scen_road_0", "s_lightindustry_scen_road_1" ],
     "name": "light industry",
+    "copy-from": "road_abstract",
     "sym": "─",
-    "color": "dark_gray",
     "see_cost": 5,
     "extras": "build",
-    "travel_cost_type": "road",
     "mondensity": 2
   },
   {
@@ -445,6 +457,7 @@
     "name": "light industry",
     "sym": "I",
     "color": "light_blue",
+    "vision_levels": "isolated_building",
     "see_cost": 5,
     "extras": "build",
     "mondensity": 2
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_isolated_road.json b/data/json/overmap/overmap_terrain/overmap_terrain_isolated_road.json
index 01828cafda0cf..328427e4e450b 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_isolated_road.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_isolated_road.json
@@ -2,6 +2,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "isolated_road_field_0", "isolated_road_field_1", "isolated_road_field_1_roof" ],
+    "vision_levels": "open_land",
     "name": "yard",
     "sym": ".",
     "color": "green",
@@ -10,6 +11,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "isolated_house_farm_gunsmith", "isolated_house_farm_roof_gunsmith" ],
+    "vision_levels": "isolated_building",
     "name": "gunsmith's home",
     "sym": "v",
     "color": "red",
@@ -19,6 +21,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "isolated_house_farm_blacksmith", "isolated_house_farm_roof_blacksmith" ],
+    "vision_levels": "isolated_building",
     "name": "blacksmith's home",
     "sym": "^",
     "color": "cyan",
@@ -28,6 +31,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "gunshow_0", "gunshow_1", "gunshow_0_roof", "gunshow_1_roof" ],
+    "vision_levels": "blends_till_details",
     "name": "gun show",
     "sym": "G",
     "color": "red",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_lab.json b/data/json/overmap/overmap_terrain/overmap_terrain_lab.json
index 4ae8cea2547ba..71a688739d59c 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_lab.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_lab.json
@@ -2,6 +2,7 @@
   {
     "type": "overmap_terrain",
     "id": "lab",
+    "vision_levels": "underground_stone",
     "name": "science lab",
     "sym": "L",
     "color": "light_blue",
@@ -12,6 +13,7 @@
   {
     "type": "overmap_terrain",
     "id": "lab_stairs",
+    "vision_levels": "underground_stone",
     "name": "science lab",
     "sym": "L",
     "color": "blue",
@@ -22,6 +24,7 @@
   {
     "type": "overmap_terrain",
     "id": "lab_core",
+    "vision_levels": "underground_stone",
     "name": "science lab",
     "sym": "L",
     "color": "light_blue",
@@ -32,6 +35,7 @@
   {
     "type": "overmap_terrain",
     "id": "lab_escape_cells",
+    "vision_levels": "underground_stone",
     "name": "science lab",
     "sym": "L",
     "color": "light_blue",
@@ -41,6 +45,7 @@
   {
     "type": "overmap_terrain",
     "id": "lab_escape_entrance",
+    "vision_levels": "underground_stone",
     "name": "science lab",
     "sym": "L",
     "color": "light_blue",
@@ -51,6 +56,7 @@
   {
     "type": "overmap_terrain",
     "id": "ants_lab",
+    "vision_levels": "underground_stone",
     "name": "science lab",
     "sym": "L",
     "color": "light_blue",
@@ -61,6 +67,7 @@
   {
     "type": "overmap_terrain",
     "id": "ants_lab_stairs",
+    "vision_levels": "underground_stone",
     "name": "science lab",
     "sym": "L",
     "color": "blue",
@@ -71,6 +78,7 @@
   {
     "type": "overmap_terrain",
     "id": "lab_finale",
+    "vision_levels": "underground_stone",
     "name": "science lab",
     "sym": "L",
     "color": "cyan",
@@ -81,6 +89,7 @@
   {
     "type": "overmap_terrain",
     "id": "ice_lab",
+    "vision_levels": "underground_stone",
     "name": "science lab",
     "sym": "L",
     "color": "light_blue",
@@ -91,6 +100,7 @@
   {
     "type": "overmap_terrain",
     "id": "ice_lab_stairs",
+    "vision_levels": "underground_stone",
     "name": "science lab",
     "sym": "L",
     "color": "blue",
@@ -101,6 +111,7 @@
   {
     "type": "overmap_terrain",
     "id": "ice_lab_core",
+    "vision_levels": "underground_stone",
     "name": "science lab",
     "sym": "L",
     "color": "light_blue",
@@ -111,6 +122,7 @@
   {
     "type": "overmap_terrain",
     "id": "ice_lab_finale",
+    "vision_levels": "underground_stone",
     "name": "science lab",
     "sym": "L",
     "color": "cyan",
@@ -121,6 +133,7 @@
   {
     "type": "overmap_terrain",
     "id": "tower_lab",
+    "vision_levels": "large_city_building",
     "name": "science lab tower",
     "sym": "L",
     "color": "light_blue",
@@ -131,6 +144,7 @@
   {
     "type": "overmap_terrain",
     "id": "tower_lab_stairs",
+    "vision_levels": "large_city_building",
     "name": "science lab tower",
     "sym": "L",
     "color": "blue",
@@ -141,6 +155,7 @@
   {
     "type": "overmap_terrain",
     "id": "tower_lab_finale",
+    "vision_levels": "large_city_building",
     "name": "science lab tower",
     "sym": "L",
     "color": "cyan",
@@ -157,6 +172,7 @@
       "office_tower_lab_b2_roof",
       "office_tower_lab_b3_roof"
     ],
+    "vision_levels": "roof_or_air",
     "name": "science lab tower roof",
     "sym": "L",
     "color": "cyan",
@@ -166,6 +182,7 @@
   {
     "type": "overmap_terrain",
     "id": "lab_train_depot",
+    "vision_levels": "underground_stone",
     "name": "science train depot",
     "sym": "L",
     "color": "light_blue",
@@ -177,6 +194,7 @@
   {
     "type": "overmap_terrain",
     "id": "central_lab_train_depot",
+    "vision_levels": "underground_stone",
     "name": "central train depot",
     "copy-from": "lab_train_depot",
     "spawns": { "group": "GROUP_CENTRAL_LAB", "population": [ 0, 5 ], "chance": 20 }
@@ -184,6 +202,7 @@
   {
     "type": "overmap_terrain",
     "id": "central_lab_entrance",
+    "vision_levels": "forested",
     "name": "forest",
     "looks_like": "forest",
     "land_use_code": "forest",
@@ -195,6 +214,7 @@
   {
     "type": "overmap_terrain",
     "id": "central_lab_shaft",
+    "vision_levels": "underground_stone",
     "name": "access shaft",
     "sym": "0",
     "color": "light_gray",
@@ -204,6 +224,7 @@
   {
     "type": "overmap_terrain",
     "abstract": "generic_central_lab",
+    "vision_levels": "underground_stone",
     "name": "central lab",
     "sym": "L",
     "color": "cyan",
@@ -229,6 +250,7 @@
   {
     "type": "overmap_terrain",
     "id": "central_lab",
+    "vision_levels": "underground_stone",
     "name": "central lab",
     "sym": "L",
     "color": "light_blue",
@@ -239,6 +261,7 @@
   {
     "type": "overmap_terrain",
     "id": "central_lab_stairs",
+    "vision_levels": "underground_stone",
     "name": "central lab",
     "sym": "L",
     "color": "blue",
@@ -249,6 +272,7 @@
   {
     "type": "overmap_terrain",
     "id": "central_lab_core",
+    "vision_levels": "underground_stone",
     "name": "central lab",
     "sym": "L",
     "color": "light_blue",
@@ -259,6 +283,7 @@
   {
     "type": "overmap_terrain",
     "id": "central_lab_finale",
+    "vision_levels": "underground_stone",
     "name": "central lab",
     "sym": "L",
     "color": "cyan",
@@ -269,6 +294,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "lab_surface_brick_basementD1_hidden_lab_stairs", "lab_surface_brick_basementE1" ],
+    "vision_levels": "underground_dirt",
     "name": "lab basement",
     "sym": "L",
     "color": "white",
@@ -293,6 +319,7 @@
     ],
     "name": "parking lot",
     "//": "parking lot attached to Research facility.",
+    "vision_levels": "large_pavement",
     "sym": "_",
     "color": "dark_gray",
     "spawns": { "group": "GROUP_LAB_SURFACE", "population": [ 5, 20 ], "chance": 50 },
@@ -319,6 +346,7 @@
       "lab_surface_parking_blockD1",
       "lab_surface_parking_blockE1"
     ],
+    "vision_levels": "large_pavement",
     "name": "parking lot",
     "//": "parking lot attached to modular mutagen lab.",
     "sym": "_",
@@ -345,6 +373,7 @@
       "lab_surface_brick_blockE4"
     ],
     "name": "research facility",
+    "vision_levels": "large_building",
     "sym": "l",
     "color": "light_gray",
     "spawns": { "group": "GROUP_LAB_SURFACE", "population": [ 10, 25 ], "chance": 60 },
@@ -356,6 +385,7 @@
     "type": "overmap_terrain",
     "id": "lab_surface_brick_blockC3",
     "name": "research facility entrance",
+    "vision_levels": "large_building",
     "sym": "L",
     "color": "white",
     "spawns": { "group": "GROUP_LAB_SURFACE", "population": [ 8, 25 ], "chance": 50 },
@@ -412,6 +442,7 @@
       "lab_surface_brick_block5E0",
       "lab_surface_brick_block5E1"
     ],
+    "vision_levels": "roof_or_air",
     "name": "open air",
     "sym": ".",
     "color": "blue",
@@ -499,6 +530,7 @@
       "lab_surface_brick_block5E4"
     ],
     "name": "research facility, roof",
+    "vision_levels": "roof_or_air",
     "sym": "l",
     "color": "dark_gray",
     "see_cost": 2
@@ -515,6 +547,7 @@
       "lab_2x2_MUT_tier_2_SW",
       "lab_2x2_MUT_tier_2_SE"
     ],
+    "vision_levels": "underground_stone",
     "name": "Lab Research Zone",
     "sym": "L",
     "color": "light_blue",
@@ -525,6 +558,7 @@
     "type": "overmap_terrain",
     "id": [ "lab_CORE_2x1_1UP", "lab_CORE_2x1_2UP", "lab_CORE_2x1_1DN", "lab_CORE_2x1_2DN" ],
     "name": "Lab Recreation Zone",
+    "vision_levels": "underground_stone",
     "sym": "X",
     "color": "white",
     "see_cost": 5,
@@ -541,6 +575,7 @@
       "lab_security_z-6_final_flr"
     ],
     "name": "Lab Security Zone",
+    "vision_levels": "underground_stone",
     "sym": "S",
     "//": "6 underground levels for a modular security tower.",
     "color": "yellow",
@@ -567,6 +602,7 @@
       "lab_2x2_cargo_SE"
     ],
     "name": "Lab Cargo Zone",
+    "vision_levels": "underground_stone",
     "sym": "C",
     "color": "white",
     "see_cost": 5,
@@ -592,6 +628,7 @@
       "lab_1x1x2_RES_8_apartments_lower"
     ],
     "name": "Lab Residential Zone",
+    "vision_levels": "underground_stone",
     "sym": "R",
     "color": "green",
     "see_cost": 5,
@@ -615,6 +652,7 @@
       "lab_security_z0S"
     ],
     "name": "Trans-Coast Logistics",
+    "vision_levels": "large_building",
     "sym": "F",
     "//": "Front/Fake company entrance for a lab.  Includes main and auxiliary entrances including the start of the security tower.",
     "color": "light_gray",
@@ -626,6 +664,7 @@
     "type": "overmap_terrain",
     "id": [ "full_basic_lab_roof", "lab_security_z0S_roof", "lab_security_z0N_roof" ],
     "name": "Trans-Coast Logistics Roof",
+    "vision_levels": "roof_or_air",
     "sym": "F",
     "color": "light_gray",
     "see_cost": 5,
@@ -635,6 +674,7 @@
     "type": "overmap_terrain",
     "id": [ "lab_health_z-2_A", "lab_health_z-2_B", "lab_health_z-3_A" ],
     "name": "Lab Health Clinic",
+    "vision_levels": "underground_stone",
     "sym": "M",
     "color": "red",
     "see_cost": 5,
@@ -645,6 +685,7 @@
     "type": "overmap_terrain",
     "id": [ "lab_health_z-3_B" ],
     "name": "Lab Health Clinic",
+    "vision_levels": "underground_stone",
     "sym": "M",
     "color": "red",
     "see_cost": 5,
@@ -654,6 +695,7 @@
     "type": "overmap_terrain",
     "id": [ "lab_maintenance_z-2&3_B", "lab_maintenance_z-2&3_A" ],
     "name": "Lab Maintenance Zone",
+    "vision_levels": "underground_stone",
     "sym": "M",
     "color": "cyan",
     "see_cost": 5,
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_mall.json b/data/json/overmap/overmap_terrain/overmap_terrain_mall.json
index 8fb68b8d3e9d8..62c8d47411af7 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_mall.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_mall.json
@@ -4,6 +4,7 @@
     "abstract": "generic_mall",
     "name": "mall",
     "color": "i_red",
+    "vision_levels": "large_city_building",
     "sym": "M",
     "see_cost": 5,
     "mondensity": 2,
@@ -12,7 +13,9 @@
   {
     "type": "overmap_terrain",
     "abstract": "generic_mall_road",
+    "vision_levels": "blends_till_outlines",
     "copy-from": "generic_mall",
+    "looks_like": "road",
     "name": "road",
     "color": "dark_gray"
   },
@@ -306,6 +309,7 @@
       "mall_a_70_basement",
       "mall_a_71_basement"
     ],
+    "vision_levels": "underground_dirt",
     "name": "solid earth",
     "color": "brown",
     "sym": "#"
@@ -323,6 +327,7 @@
       "mall_a_68_sub_basement",
       "mall_a_69_sub_basement"
     ],
+    "vision_levels": "underground_stone",
     "copy-from": "generic_mall",
     "name": "mall - subway station",
     "color": "i_light_red"
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_mansion.json b/data/json/overmap/overmap_terrain/overmap_terrain_mansion.json
index d2fe99766eaa9..794012cbda566 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_mansion.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_mansion.json
@@ -2,6 +2,7 @@
   {
     "type": "overmap_terrain",
     "abstract": "generic_mansion_entrance",
+    "vision_levels": "large_building",
     "name": "mansion",
     "sym": "M",
     "color": "light_green",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_mi-go.json b/data/json/overmap/overmap_terrain/overmap_terrain_mi-go.json
index 7f8d5e90b0996..9ae5f0ca8d060 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_mi-go.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_mi-go.json
@@ -1,16 +1,8 @@
 [
   {
     "type": "overmap_terrain",
-    "id": "mi-go_camp1",
-    "name": "mi-go encampment",
-    "sym": "<",
-    "color": "dark_gray",
-    "mondensity": 2,
-    "flags": [ "RISK_EXTREME" ]
-  },
-  {
-    "type": "overmap_terrain",
-    "id": "mi-go_camp1-1",
+    "id": [ "mi-go_camp1", "mi-go_camp1-1" ],
+    "vision_levels": "isolated_tower",
     "name": "mi-go encampment",
     "sym": "<",
     "color": "dark_gray",
@@ -20,11 +12,9 @@
   {
     "type": "overmap_terrain",
     "id": "mi-go_camp2",
-    "name": "mi-go encampment",
     "sym": ">",
     "color": "light_gray",
-    "mondensity": 2,
-    "flags": [ "RISK_EXTREME" ]
+    "copy-from": "mi-go_camp1"
   },
   {
     "type": "overmap_terrain",
@@ -32,8 +22,7 @@
     "name": "mi-go spire",
     "sym": ">",
     "color": "light_gray",
-    "mondensity": 2,
-    "flags": [ "RISK_EXTREME" ]
+    "copy-from": "mi-go_camp1"
   },
   {
     "type": "overmap_terrain",
@@ -41,8 +30,7 @@
     "name": "mi-go landing platform",
     "sym": "_",
     "color": "light_gray",
-    "mondensity": 2,
-    "flags": [ "RISK_EXTREME" ]
+    "copy-from": "mi-go_camp1"
   },
   {
     "type": "overmap_terrain",
@@ -50,8 +38,7 @@
     "name": "mi-go landing roof",
     "sym": "_",
     "color": "light_gray",
-    "mondensity": 2,
-    "flags": [ "RISK_EXTREME" ]
+    "copy-from": "mi-go_camp1"
   },
   {
     "type": "overmap_terrain",
@@ -66,16 +53,14 @@
       "mi-go_scout_tower_4"
     ],
     "name": "mi-go scout tower",
-    "sym": ">",
-    "color": "light_gray",
-    "mondensity": 2,
-    "flags": [ "RISK_EXTREME" ]
+    "copy-from": "mi-go_camp1"
   },
   {
     "type": "overmap_terrain",
     "id": "mi-go_portal",
     "name": "mi-go structure",
     "sym": "=",
+    "vision_levels": "blends_till_details",
     "color": "dark_gray",
     "mondensity": 2,
     "flags": [ "RISK_EXTREME" ]
@@ -84,6 +69,7 @@
     "type": "overmap_terrain",
     "id": "mi-go_portal_roof",
     "name": "mi-go structure roof",
+    "vision_levels": "roof_or_air",
     "sym": "=",
     "color": "dark_gray",
     "mondensity": 2,
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_microlab.json b/data/json/overmap/overmap_terrain/overmap_terrain_microlab.json
index 08080069873e7..7a1b91cb52527 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_microlab.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_microlab.json
@@ -2,6 +2,7 @@
   {
     "type": "overmap_terrain",
     "id": "microlab_generic",
+    "vision_levels": "underground_stone",
     "name": "science lab",
     "sym": "L",
     "color": "light_blue",
@@ -26,6 +27,7 @@
   {
     "type": "overmap_terrain",
     "id": "microlab_sub_station",
+    "vision_levels": "underground_stone",
     "name": "subway station?",
     "sym": "S",
     "color": "light_blue",
@@ -56,6 +58,7 @@
       "microlab_generic_isolated_stairs_up",
       "microlab_generic_isolated_elevator_pit"
     ],
+    "vision_levels": "underground_stone",
     "name": "science lab",
     "sym": "L",
     "color": "cyan",
@@ -76,6 +79,7 @@
       "microlab_portal_security_hallway1",
       "microlab_portal_security_hallway2"
     ],
+    "vision_levels": "underground_stone",
     "name": "physics lab",
     "sym": "L",
     "color": "red",
@@ -85,6 +89,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "microlab_generic_hallway" ],
+    "vision_levels": "underground_stone",
     "name": "lab hallway",
     "color": "light_red",
     "see_cost": 5,
@@ -93,6 +98,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "microlab_reactor", "microlab_reactor_b" ],
+    "vision_levels": "underground_stone",
     "name": "science lab reactor",
     "sym": "L",
     "color": "light_red",
@@ -109,6 +115,7 @@
   {
     "type": "overmap_terrain",
     "id": "microlab_distorted_hallway",
+    "vision_levels": "underground_stone",
     "name": "distorted hallway",
     "color": "light_red",
     "see_cost": 5,
@@ -117,6 +124,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "microlab_portal_elevator", "microlab_portal_elevator_physics_glass" ],
+    "vision_levels": "underground_stone",
     "name": "physics department elevator",
     "color": "light_red",
     "sym": "L",
@@ -125,6 +133,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "microlab_portal_MSU14_elevator" ],
+    "vision_levels": "underground_stone",
     "name": "Hub 14 elevator",
     "color": "cyan",
     "sym": "L",
@@ -133,6 +142,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "microlab_portal_MSU14" ],
+    "vision_levels": "underground_stone",
     "name": "Hub 14",
     "sym": "L",
     "color": "cyan",
@@ -142,6 +152,7 @@
   {
     "type": "overmap_terrain",
     "id": "microlab_portal_elevator_nether_glass",
+    "vision_levels": "underground_stone",
     "name": "lost level",
     "color": "black",
     "sym": " ",
@@ -150,6 +161,7 @@
   {
     "type": "overmap_terrain",
     "id": "microlab_generic_surface",
+    "vision_levels": "underground_stone",
     "name": "lab",
     "sym": "L",
     "color": "blue",
@@ -163,6 +175,7 @@
   {
     "type": "overmap_terrain",
     "id": "microlab_ratkin",
+    "vision_levels": "underground_stone",
     "name": "science lab",
     "sym": "L",
     "color": "green",
@@ -190,6 +203,7 @@
   {
     "type": "overmap_terrain",
     "id": "microlab_sub_station_ratkin",
+    "vision_levels": "underground_stone",
     "name": "pump station?",
     "sym": "P",
     "color": "green",
@@ -200,6 +214,7 @@
   {
     "type": "overmap_terrain",
     "id": "microlab_ratkin_sub_entry",
+    "vision_levels": "underground_stone",
     "name": "science lab",
     "sym": "L",
     "color": "green",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_military.json b/data/json/overmap/overmap_terrain/overmap_terrain_military.json
index fe0d70c9d9adf..25deed3aeb081 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_military.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_military.json
@@ -2,6 +2,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "fema_entrance", "fema_entrance_roof" ],
+    "vision_levels": "isolated_building",
     "name": "FEMA camp",
     "sym": "+",
     "color": "blue",
@@ -23,6 +24,7 @@
       "fema_roof",
       "fema_1_3_roof"
     ],
+    "vision_levels": "isolated_building",
     "name": "FEMA camp",
     "sym": "F",
     "color": "i_blue",
@@ -34,6 +36,7 @@
     "type": "overmap_terrain",
     "id": [ "FEMA_tlc", "FEMA_te", "FEMA_trc", "FEMA_le", "FEMA_mid", "FEMA_re", "FEMA_blc", "FEMA_brc" ],
     "name": "FEMA refugee camp",
+    "vision_levels": "isolated_building",
     "sym": "F",
     "color": "i_blue",
     "extras": "build",
@@ -43,6 +46,7 @@
   {
     "type": "overmap_terrain",
     "id": "FEMA_entrance",
+    "vision_levels": "isolated_building",
     "name": "FEMA refugee camp",
     "sym": "+",
     "color": "blue",
@@ -52,142 +56,114 @@
   },
   {
     "type": "overmap_terrain",
-    "id": [ "shelter", "shelter_vandal", "shelter_unfinished", "shelter_survivor" ],
-    "name": "evac shelter A-23",
+    "abstract": "shelter_abstract",
     "sym": "+",
     "color": "white",
-    "see_cost": 2,
+    "vision_levels": "isolated_building",
+    "see_cost": 2
+  },
+  {
+    "type": "overmap_terrain",
+    "id": [ "shelter", "shelter_vandal", "shelter_unfinished", "shelter_survivor" ],
+    "name": "evac shelter A-23",
+    "copy-from": "shelter_abstract",
     "flags": [ "KNOWN_DOWN", "SOURCE_PEOPLE", "SOURCE_SAFETY" ]
   },
   {
     "type": "overmap_terrain",
     "id": [ "shelter_infested" ],
-    "name": "evac shelter A-23",
-    "sym": "+",
-    "color": "white",
-    "see_cost": 2,
+    "copy-from": "shelter",
     "flags": [ "KNOWN_DOWN", "RISK_HIGH" ]
   },
   {
     "type": "overmap_terrain",
     "id": [ "shelter_1", "shelter_1_vandal", "shelter_1_unfinished", "shelter_1_survivor" ],
     "name": "evac shelter B-05",
-    "sym": "+",
-    "color": "white",
-    "see_cost": 2,
+    "copy-from": "shelter_abstract",
     "flags": [ "KNOWN_DOWN", "SOURCE_PEOPLE", "SOURCE_SAFETY" ]
   },
   {
     "type": "overmap_terrain",
     "id": [ "shelter_1_infested" ],
-    "name": "evac shelter B-05",
-    "sym": "+",
-    "color": "white",
-    "see_cost": 2,
+    "copy-from": "shelter_1",
     "flags": [ "KNOWN_DOWN", "RISK_HIGH" ]
   },
   {
     "type": "overmap_terrain",
     "id": [ "shelter_1b", "shelter_1b_vandal", "shelter_1b_unfinished", "shelter_1b_survivor" ],
+    "copy-from": "shelter_abstract",
     "name": "evac shelter B-19",
-    "sym": "+",
-    "color": "white",
-    "see_cost": 2,
     "flags": [ "KNOWN_DOWN", "SOURCE_PEOPLE", "SOURCE_SAFETY" ]
   },
   {
     "type": "overmap_terrain",
     "id": [ "shelter_1b_infested" ],
-    "name": "evac shelter B-19",
-    "sym": "+",
-    "color": "white",
-    "see_cost": 2,
+    "copy-from": "shelter_1b",
     "flags": [ "KNOWN_DOWN", "RISK_HIGH" ]
   },
   {
     "type": "overmap_terrain",
     "id": [ "shelter_2", "shelter_2_vandal", "shelter_2_unfinished", "shelter_2_survivor" ],
     "name": "evac shelter C-41",
-    "sym": "+",
-    "color": "white",
-    "see_cost": 2,
+    "copy-from": "shelter_abstract",
     "flags": [ "KNOWN_DOWN", "SOURCE_PEOPLE", "SOURCE_SAFETY" ]
   },
   {
     "type": "overmap_terrain",
     "id": [ "shelter_2_infested" ],
-    "name": "evac shelter C-41",
-    "sym": "+",
-    "color": "white",
-    "see_cost": 2,
+    "copy-from": "shelter_2",
     "flags": [ "KNOWN_DOWN", "RISK_HIGH" ]
   },
   {
     "type": "overmap_terrain",
     "id": [ "shelter_roof" ],
     "name": "evac shelter roof A-23",
-    "sym": "+",
-    "color": "white",
-    "see_cost": 2
+    "copy-from": "shelter_abstract"
   },
   {
     "type": "overmap_terrain",
     "id": [ "shelter_roof_1" ],
     "name": "evac shelter roof B-05",
-    "sym": "+",
-    "color": "white",
-    "see_cost": 2
+    "copy-from": "shelter_abstract"
   },
   {
     "type": "overmap_terrain",
     "id": [ "shelter_roof_1b" ],
     "name": "evac shelter roof B-19",
-    "sym": "+",
-    "color": "white",
-    "see_cost": 2
+    "copy-from": "shelter_abstract"
   },
   {
     "type": "overmap_terrain",
     "id": [ "shelter_roof_2" ],
     "name": "evac shelter roof C-41",
-    "sym": "+",
-    "color": "white",
-    "see_cost": 2
+    "copy-from": "shelter_abstract"
   },
   {
     "type": "overmap_terrain",
     "id": [ "shelter_under", "shelter_under_vandal", "shelter_under_unfinished", "shelter_under_infested" ],
     "name": "evac shelter basement A-23",
-    "sym": "+",
-    "color": "white",
-    "see_cost": 2,
+    "copy-from": "shelter_abstract",
     "flags": [ "KNOWN_UP" ]
   },
   {
     "type": "overmap_terrain",
     "id": [ "shelter_under_1b", "shelter_under_1b_vandal", "shelter_under_1b_unfinished", "shelter_under_1b_infested" ],
     "name": "evac shelter basement B-19",
-    "sym": "+",
-    "color": "white",
-    "see_cost": 2,
+    "copy-from": "shelter_abstract",
     "flags": [ "KNOWN_UP" ]
   },
   {
     "type": "overmap_terrain",
     "id": [ "shelter_under_2", "shelter_under_2_vandal", "shelter_under_2_unfinished", "shelter_under_2_infested" ],
     "name": "evac shelter basement C-41",
-    "sym": "+",
-    "color": "white",
-    "see_cost": 2,
+    "copy-from": "shelter_abstract",
     "flags": [ "KNOWN_UP" ]
   },
   {
     "type": "overmap_terrain",
     "id": [ "shelter_under_1", "shelter_under_1_vandal", "shelter_under_1_unfinished", "shelter_under_1_infested" ],
     "name": "evac shelter basement B-05",
-    "sym": "+",
-    "color": "white",
-    "see_cost": 2,
+    "copy-from": "shelter_abstract",
     "flags": [ "KNOWN_UP" ]
   },
   {
@@ -196,6 +172,7 @@
     "name": "LMOE shelter",
     "sym": "+",
     "color": "red",
+    "vision_levels": "natural_outcropping",
     "see_cost": 2,
     "flags": [ "KNOWN_DOWN", "SOURCE_PEOPLE", "SOURCE_SAFETY", "SOURCE_GUN", "SOURCE_AMMO", "SOURCE_FOOD" ]
   },
@@ -205,6 +182,7 @@
     "name": "LMOE shelter",
     "sym": "+",
     "color": "red",
+    "vision_levels": "natural_outcropping",
     "see_cost": 2,
     "flags": [ "KNOWN_DOWN", "SOURCE_PEOPLE", "SOURCE_SAFETY", "SOURCE_GUN", "SOURCE_AMMO", "SOURCE_FOOD" ]
   },
@@ -212,6 +190,7 @@
     "type": "overmap_terrain",
     "id": "lmoe_roof",
     "name": "LMOE shelter",
+    "vision_levels": "roof_or_air",
     "sym": ".",
     "color": "brown",
     "see_cost": 2,
@@ -221,6 +200,7 @@
     "type": "overmap_terrain",
     "id": "lmoe_under",
     "name": "LMOE shelter",
+    "vision_levels": "underground_dirt",
     "sym": "+",
     "color": "red",
     "see_cost": 2,
@@ -230,6 +210,7 @@
     "type": "overmap_terrain",
     "id": "lmoe_under_empty",
     "name": "LMOE shelter",
+    "vision_levels": "underground_dirt",
     "sym": "+",
     "color": "red",
     "see_cost": 2,
@@ -239,6 +220,7 @@
     "type": "overmap_terrain",
     "id": "lmoe_under_empty_prepperquest",
     "name": "LMOE shelter",
+    "vision_levels": "underground_dirt",
     "sym": "+",
     "color": "red",
     "see_cost": 2,
@@ -248,6 +230,7 @@
     "type": "overmap_terrain",
     "id": "lmoe_zombie",
     "name": "LMOE shelter",
+    "vision_levels": "natural_outcropping",
     "sym": "+",
     "color": "red",
     "see_cost": 2,
@@ -257,6 +240,7 @@
     "type": "overmap_terrain",
     "id": "lmoe_zombie_under_empty",
     "name": "LMOE shelter",
+    "vision_levels": "underground_dirt",
     "sym": "+",
     "color": "red",
     "see_cost": 2,
@@ -266,6 +250,7 @@
     "type": "overmap_terrain",
     "id": "cabin_prepper_shelter",
     "name": "LMOE shelter",
+    "vision_levels": "underground_dirt",
     "sym": "+",
     "color": "red",
     "see_cost": 2,
@@ -277,6 +262,7 @@
     "name": "military bunker",
     "sym": "B",
     "color": "red",
+    "vision_levels": "isolated_building",
     "see_cost": 2,
     "flags": [ "KNOWN_DOWN", "RISK_EXTREME", "SOURCE_WEAPON", "SOURCE_AMMO" ]
   },
@@ -286,6 +272,7 @@
     "name": "military bunker",
     "sym": "B",
     "color": "red",
+    "vision_levels": "isolated_building",
     "see_cost": 2,
     "flags": [ "KNOWN_UP", "RISK_EXTREME", "SOURCE_WEAPON", "SOURCE_AMMO" ]
   },
@@ -295,6 +282,7 @@
     "name": "military bunker",
     "sym": "B",
     "color": "red",
+    "vision_levels": "isolated_building",
     "see_cost": 2,
     "flags": [ "RISK_EXTREME", "SOURCE_WEAPON", "SOURCE_AMMO" ]
   },
@@ -304,6 +292,7 @@
     "name": "military outpost",
     "sym": "M",
     "color": "red",
+    "vision_levels": "isolated_building",
     "see_cost": 2,
     "extras": "build",
     "flags": [ "RISK_EXTREME", "SOURCE_WEAPON", "SOURCE_AMMO" ]
@@ -314,6 +303,7 @@
     "name": "military outpost",
     "sym": "M",
     "color": "red",
+    "vision_levels": "isolated_building",
     "see_cost": 2,
     "extras": "build",
     "flags": [ "RISK_EXTREME", "SOURCE_WEAPON", "SOURCE_AMMO" ]
@@ -324,6 +314,7 @@
     "name": "military outpost roof",
     "sym": "M",
     "color": "red",
+    "vision_levels": "isolated_building",
     "see_cost": 2,
     "extras": "build"
   },
@@ -333,6 +324,7 @@
     "name": "missile silo",
     "sym": "0",
     "color": "red",
+    "vision_levels": "open_land",
     "see_cost": 2,
     "flags": [ "NO_ROTATE", "RISK_EXTREME" ]
   },
@@ -349,6 +341,7 @@
     "copy-from": "generic_city_building_no_sidewalk",
     "name": "fire lookout tower",
     "sym": "T",
+    "vision_levels": "isolated_tower",
     "color": "red",
     "flags": [ "SOURCE_SAFETY" ]
   },
@@ -356,6 +349,7 @@
     "type": "overmap_terrain",
     "id": [ "ws_survivor_bunker_f0", "ws_survivor_bunker_f-1" ],
     "copy-from": "generic_city_building_no_sidewalk",
+    "vision_levels": "blends_till_details",
     "name": "survivor's bunker",
     "sym": "b",
     "color": "green",
@@ -388,6 +382,7 @@
       "mil_base_7i"
     ],
     "name": "military helipad",
+    "vision_levels": "large_building",
     "sym": "H",
     "color": "red",
     "see_cost": 5,
@@ -422,6 +417,7 @@
       "mil_base_8e"
     ],
     "name": "military base",
+    "vision_levels": "large_building",
     "sym": "M",
     "color": "red",
     "see_cost": 5
@@ -460,6 +456,7 @@
       "mil_base_8j"
     ],
     "name": "military base",
+    "vision_levels": "open_land",
     "sym": ",",
     "color": "brown",
     "see_cost": 2
@@ -511,6 +508,7 @@
     ],
     "name": "military base roof",
     "sym": "M",
+    "vision_levels": "roof_or_air",
     "color": "red",
     "see_cost": 5
   },
@@ -528,6 +526,7 @@
       "mil_base_tunnels_i"
     ],
     "name": "military base tunnels",
+    "vision_levels": "underground_dirt",
     "sym": "M",
     "color": "red",
     "see_cost": 5
@@ -555,6 +554,7 @@
       "mil_base_8k1"
     ],
     "name": "military base watchtower",
+    "vision_levels": "isolated_tower",
     "sym": "W",
     "color": "dark_gray",
     "see_cost": 2
@@ -563,6 +563,7 @@
     "type": "overmap_terrain",
     "id": [ "mil_base_3i", "mil_base_3i1", "mil_base_3i2", "mil_base_3i3", "mil_base_3i4" ],
     "name": "military base radio tower",
+    "vision_levels": "isolated_tower",
     "sym": "X",
     "color": "light_gray",
     "see_cost": 2
@@ -582,6 +583,7 @@
     ],
     "name": "military base",
     "sym": "_",
+    "vision_levels": "large_pavement",
     "color": "dark_gray",
     "see_cost": 1
   },
@@ -589,6 +591,7 @@
     "type": "overmap_terrain",
     "abstract": "generic_mil_base_minefield",
     "name": "military base minefield",
+    "vision_levels": "open_land",
     "color": "light_gray",
     "see_cost": 2
   },
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_militia.json b/data/json/overmap/overmap_terrain/overmap_terrain_militia.json
index 66de9db0802cf..f3b6cd099704d 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_militia.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_militia.json
@@ -28,6 +28,7 @@
       "GMLODGE3_roof_3"
     ],
     "name": "Militia Lodge",
+    "vision_levels": "isolated_building",
     "sym": "L",
     "color": "brown",
     "see_cost": 5
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_nether.json b/data/json/overmap/overmap_terrain/overmap_terrain_nether.json
index b9f7fcaf093a6..bf5ad2009341b 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_nether.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_nether.json
@@ -2,6 +2,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "nether_glass", "nether_glass_deep", "nether_glass_impassable" ],
+    "vision_levels": "always_full",
     "name": "abyss",
     "sym": " ",
     "color": "black",
@@ -11,6 +12,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "void_spider_lair_entrance", "void_spider_lair_a1", "void_spider_lair_a2" ],
+    "vision_levels": "always_full",
     "name": "abyss",
     "sym": " ",
     "color": "black",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_nether_monster_corpse.json b/data/json/overmap/overmap_terrain/overmap_terrain_nether_monster_corpse.json
index 5d0f441b6f886..ffd0d567abc03 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_nether_monster_corpse.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_nether_monster_corpse.json
@@ -3,6 +3,7 @@
     "type": "overmap_terrain",
     "id": "corpse_surface",
     "name": "monster corpse",
+    "vision_levels": "natural_outcropping",
     "copy-from": "corpse_bowels_empty_edge",
     "flags": [ "RISK_HIGH", "REQUIRES_PREDECESSOR" ],
     "sym": "T"
@@ -17,6 +18,7 @@
       "corpse_bowels_lcorner",
       "corpse_bowels_empty_edge"
     ],
+    "vision_levels": "underground_dirt",
     "name": "monster corpse bowels",
     "sym": "O",
     "color": "light_red",
@@ -26,6 +28,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "corpse_bowels_mid" ],
+    "vision_levels": "underground_dirt",
     "name": "monster corpse bowels",
     "sym": "O",
     "color": "light_red",
@@ -54,6 +57,7 @@
     "type": "overmap_terrain",
     "id": "corpse_tentacle_surface_entry",
     "copy-from": "corpse_bowels_empty_edge",
+    "vision_levels": "natural_outcropping",
     "name": "monster corpse",
     "sym": "M",
     "color": "blue",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_nuclear_plant.json b/data/json/overmap/overmap_terrain/overmap_terrain_nuclear_plant.json
index be11805f23c4b..334558a274384 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_nuclear_plant.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_nuclear_plant.json
@@ -512,6 +512,7 @@
       "nuclear_plant_7_3_7",
       "nuclear_plant_8_3_7"
     ],
+    "vision_levels": "large_building",
     "name": "nuclear plant",
     "sym": "N",
     "color": "red",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_oil_platform.json b/data/json/overmap/overmap_terrain/overmap_terrain_oil_platform.json
index 2bb1c28dcecf9..b1882dddb50f3 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_oil_platform.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_oil_platform.json
@@ -36,6 +36,7 @@
       "oil_platform_4b_5",
       "oil_platform_4c_5"
     ],
+    "vision_levels": "large_structure",
     "name": "oil platform",
     "sym": "O",
     "color": "red",
@@ -54,6 +55,7 @@
       "oil_platform_3b_4",
       "oil_platform_3c_4"
     ],
+    "vision_levels": "large_structure",
     "name": "oil platform",
     "sym": "O",
     "color": "red",
@@ -159,6 +161,7 @@
       "oil_platform_4b_z-9",
       "oil_platform_4c_z-9"
     ],
+    "vision_levels": "large_structure",
     "name": "oil platform",
     "sym": "O",
     "color": "red",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_private_resort.json b/data/json/overmap/overmap_terrain/overmap_terrain_private_resort.json
index 3775945130b35..a994b6a956792 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_private_resort.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_private_resort.json
@@ -5,6 +5,7 @@
     "name": "private resort",
     "sym": "p",
     "color": "yellow",
+    "vision_levels": "large_building",
     "see_cost": 5,
     "mondensity": 1,
     "flags": [ "RISK_EXTREME", "SOURCE_DRINK", "SOURCE_LUXURY" ]
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_public_institutional.json b/data/json/overmap/overmap_terrain/overmap_terrain_public_institutional.json
index 2f7fa9147db6b..4717653c73dca 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_public_institutional.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_public_institutional.json
@@ -10,6 +10,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "church_roof", "church_2ndfloor_1", "church_3rdfloor_1", "church_roof_1" ],
+    "vision_levels": "roof_or_air",
     "copy-from": "generic_city_building",
     "name": "church roof",
     "sym": "C",
@@ -27,6 +28,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "rural_church", "rural_church_parking" ],
+    "vision_levels": "isolated_building",
     "name": "rural church",
     "sym": "C",
     "color": "light_red",
@@ -35,6 +37,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "rural_church_steeple" ],
+    "vision_levels": "isolated_building",
     "name": "rural church steeple",
     "sym": "C",
     "color": "light_red",
@@ -43,6 +46,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "rural_church_steeple_roof" ],
+    "vision_levels": "roof_or_air",
     "name": "rural church steeple roof",
     "sym": "C",
     "color": "light_red",
@@ -51,6 +55,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "rural_church_basement" ],
+    "vision_levels": "underground_dirt",
     "name": "church basement",
     "sym": "B",
     "color": "light_red"
@@ -88,6 +93,7 @@
       "cathedral_3_SE"
     ],
     "name": "cathedral",
+    "vision_levels": "large_city_building",
     "sym": "C",
     "color": "i_light_red",
     "see_cost": 5,
@@ -213,6 +219,7 @@
   {
     "type": "overmap_terrain",
     "abstract": "generic_hospital",
+    "vision_levels": "large_city_building",
     "copy-from": "generic_city_building",
     "name": "hospital",
     "sym": "H",
@@ -281,6 +288,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "school_1_1", "school_1_3", "school_1_4", "school_1_5", "school_1_6", "school_1_7", "school_1_8", "school_1_9" ],
+    "vision_levels": "large_city_building",
     "name": "regional school",
     "sym": "s",
     "color": "light_blue",
@@ -291,6 +299,7 @@
   {
     "type": "overmap_terrain",
     "id": "school_1_2",
+    "vision_levels": "large_city_building",
     "name": "regional school",
     "sym": "S",
     "color": "light_blue",
@@ -328,6 +337,7 @@
       "school_5_6"
     ],
     "name": "regional school",
+    "vision_levels": "large_city_building",
     "sym": "s",
     "color": "light_blue",
     "see_cost": 5,
@@ -347,6 +357,7 @@
       "prison_1_8",
       "prison_1_9"
     ],
+    "vision_levels": "large_building",
     "name": "prison",
     "sym": "p",
     "color": "i_light_blue",
@@ -473,6 +484,7 @@
       "prison_island_1_ug_14",
       "prison_island_1_ug_15"
     ],
+    "vision_levels": "large_structure",
     "name": "prison",
     "sym": "p",
     "color": "i_light_blue",
@@ -530,6 +542,7 @@
     "type": "overmap_terrain",
     "id": [ "homeless_0_0_0", "homeless_1_0_0" ],
     "name": "homeless shelter",
+    "vision_levels": "city_building",
     "sym": "H",
     "color": "green",
     "see_cost": 2,
@@ -548,6 +561,7 @@
       "homeless_0_0_4"
     ],
     "name": "homeless shelter",
+    "vision_levels": "city_building",
     "sym": "H",
     "color": "green",
     "see_cost": 2,
@@ -557,6 +571,7 @@
     "type": "overmap_terrain",
     "id": [ "town_hall_0_0_0", "town_hall_1_0_0", "town_hall_0_1_0", "town_hall_1_1_0" ],
     "name": "town hall",
+    "vision_levels": "city_building",
     "sym": "^",
     "color": "i_black",
     "see_cost": 2,
@@ -566,6 +581,7 @@
     "type": "overmap_terrain",
     "id": [ "town_hall_0_0_1", "town_hall_1_0_1", "town_hall_0_1_1", "town_hall_1_1_1" ],
     "name": "town hall",
+    "vision_levels": "city_building",
     "sym": "^",
     "color": "i_black",
     "see_cost": 2,
@@ -575,6 +591,7 @@
     "type": "overmap_terrain",
     "id": [ "town_hall_0_0_roof", "town_hall_1_0_roof", "town_hall_0_1_roof", "town_hall_1_1_roof", "town_hall_1_1_upper_roof" ],
     "name": "town hall",
+    "vision_levels": "roof_or_air",
     "sym": "^",
     "color": "i_black",
     "see_cost": 2,
@@ -591,6 +608,7 @@
       "sealab_small_-4",
       "sealab_small_-5"
     ],
+    "vision_levels": "large_structure",
     "name": "freshwater research station",
     "sym": "~",
     "color": "yellow",
@@ -606,6 +624,7 @@
       "nursing_home_sh6",
       "nursing_home_sh7"
     ],
+    "vision_levels": "large_building",
     "name": "nursing home",
     "sym": "N",
     "color": "white"
@@ -613,6 +632,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "nursing_home_sh9", "nursing_home_sh10", "nursing_home_sh11" ],
+    "vision_levels": "large_pavement",
     "name": "parking lot",
     "sym": "O",
     "color": "dark_gray"
@@ -620,27 +640,25 @@
   {
     "type": "overmap_terrain",
     "id": [ "nursing_home_sh4" ],
-    "name": "road",
-    "sym": "┐",
-    "color": "dark_gray"
+    "copy-from": "road_abstract",
+    "sym": "┐"
   },
   {
     "type": "overmap_terrain",
     "id": [ "nursing_home_sh8" ],
-    "name": "road",
-    "sym": "│",
-    "color": "dark_gray"
+    "copy-from": "road_abstract",
+    "sym": "│"
   },
   {
     "type": "overmap_terrain",
     "id": [ "nursing_home_sh12" ],
-    "name": "road",
-    "sym": "┤",
-    "color": "dark_gray"
+    "copy-from": "road_abstract",
+    "sym": "┤"
   },
   {
     "type": "overmap_terrain",
     "id": [ "nursing_home_1", "nursing_home_2", "nursing_home_3", "nursing_home_5", "nursing_home_6", "nursing_home_7" ],
+    "vision_levels": "large_building",
     "name": "nursing home",
     "sym": "N",
     "color": "white"
@@ -648,6 +666,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "nursing_home_9", "nursing_home_10", "nursing_home_11" ],
+    "vision_levels": "large_building",
     "name": "parking lot",
     "sym": "O",
     "color": "dark_gray"
@@ -655,23 +674,20 @@
   {
     "type": "overmap_terrain",
     "id": [ "nursing_home_4" ],
-    "name": "road",
-    "sym": "┐",
-    "color": "dark_gray"
+    "copy-from": "road_abstract",
+    "sym": "┐"
   },
   {
     "type": "overmap_terrain",
     "id": [ "nursing_home_8" ],
     "name": "road",
-    "sym": "│",
-    "color": "dark_gray"
+    "sym": "│"
   },
   {
     "type": "overmap_terrain",
     "id": [ "nursing_home_12" ],
-    "name": "road",
-    "sym": "┤",
-    "color": "dark_gray"
+    "copy-from": "road_abstract",
+    "sym": "┤"
   },
   {
     "type": "overmap_terrain",
@@ -683,6 +699,7 @@
       "nursing_home_5_roof",
       "nursing_home_6_roof"
     ],
+    "vision_levels": "roof_or_air",
     "name": "nursing home roof",
     "sym": "N",
     "color": "white"
@@ -703,6 +720,7 @@
       "nursing_home_b11",
       "nursing_home_b12"
     ],
+    "vision_levels": "underground_dirt",
     "name": "nursing home basement",
     "sym": "N",
     "color": "light_gray"
@@ -723,6 +741,7 @@
       "nursing_home_bb11",
       "nursing_home_bb12"
     ],
+    "vision_levels": "underground_dirt",
     "name": "nursing home basement",
     "sym": "N",
     "color": "light_gray"
@@ -743,6 +762,7 @@
       "nursing_home_lab11",
       "nursing_home_lab12"
     ],
+    "vision_levels": "underground_stone",
     "name": "nursing home lab",
     "sym": "N",
     "color": "dark_gray"
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_ranch_camp.json b/data/json/overmap/overmap_terrain/overmap_terrain_ranch_camp.json
index 2e5192a46cdeb..1a3785e4ca254 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_ranch_camp.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_ranch_camp.json
@@ -2,6 +2,7 @@
   {
     "type": "overmap_terrain",
     "id": "ranch_camp_1",
+    "vision_levels": "open_land",
     "name": "ranch field",
     "sym": "┌",
     "color": "brown",
@@ -24,6 +25,7 @@
     ],
     "name": "ranch field",
     "sym": "─",
+    "vision_levels": "open_land",
     "color": "brown",
     "see_cost": 2
   },
@@ -31,6 +33,7 @@
     "type": "overmap_terrain",
     "id": [ "ranch_camp_9", "ranch_camp_69" ],
     "name": "ranch field",
+    "vision_levels": "open_land",
     "sym": "┐",
     "color": "brown",
     "see_cost": 2
@@ -55,6 +58,7 @@
       "ranch_camp_72"
     ],
     "name": "ranch field",
+    "vision_levels": "open_land",
     "sym": "│",
     "color": "brown",
     "see_cost": 2
@@ -107,6 +111,7 @@
       "ranch_camp_71"
     ],
     "name": "ranch field",
+    "vision_levels": "open_land",
     "sym": "#",
     "color": "brown",
     "see_cost": 2
@@ -114,6 +119,7 @@
   {
     "type": "overmap_terrain",
     "id": "ranch_camp_17",
+    "vision_levels": "single_water",
     "name": "pond",
     "sym": "P",
     "color": "blue",
@@ -122,6 +128,7 @@
   {
     "type": "overmap_terrain",
     "id": "ranch_camp_57",
+    "vision_levels": "isolated_tower",
     "name": "silo",
     "sym": "#",
     "color": "i_brown",
@@ -130,6 +137,7 @@
   {
     "type": "overmap_terrain",
     "id": "ranch_camp_57_silo",
+    "vision_levels": "isolated_tower",
     "name": "silo",
     "sym": "│",
     "color": "brown",
@@ -138,6 +146,7 @@
   {
     "type": "overmap_terrain",
     "id": "ranch_camp_57_silocap",
+    "vision_levels": "isolated_tower",
     "name": "silo cap",
     "sym": "│",
     "color": "brown",
@@ -146,6 +155,7 @@
   {
     "type": "overmap_terrain",
     "id": "ranch_camp_65_roof",
+    "vision_levels": "roof_or_air",
     "name": "barn roof",
     "sym": "#",
     "color": "brown",
@@ -154,6 +164,7 @@
   {
     "type": "overmap_terrain",
     "id": "ranch_camp_66",
+    "vision_levels": "isolated_building",
     "name": "barn",
     "sym": "#",
     "color": "i_brown",
@@ -162,6 +173,7 @@
   {
     "type": "overmap_terrain",
     "id": "ranch_camp_66_roof",
+    "vision_levels": "roof_or_air",
     "name": "barn roof",
     "sym": "#",
     "color": "i_brown",
@@ -170,6 +182,7 @@
   {
     "type": "overmap_terrain",
     "id": "ranch_camp_67",
+    "vision_levels": "isolated_building",
     "name": "garage",
     "sym": "O",
     "color": "white",
@@ -178,6 +191,7 @@
   {
     "type": "overmap_terrain",
     "id": "ranch_camp_67_roof",
+    "vision_levels": "roof_or_air",
     "name": "garage roof",
     "sym": "O",
     "color": "white",
@@ -186,6 +200,7 @@
   {
     "type": "overmap_terrain",
     "id": "ranch_camp_68",
+    "vision_levels": "isolated_building",
     "name": "ranch",
     "sym": "v",
     "color": "light_green",
@@ -194,6 +209,7 @@
   {
     "type": "overmap_terrain",
     "id": "ranch_camp_68_roof",
+    "vision_levels": "roof_or_air",
     "name": "ranch roof",
     "sym": "v",
     "color": "light_green",
@@ -202,6 +218,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "ranch_camp_75", "ranch_camp_75_roof", "ranch_camp_81" ],
+    "vision_levels": "open_land",
     "name": "ranch field",
     "sym": "┘",
     "color": "brown",
@@ -210,6 +227,7 @@
   {
     "type": "overmap_terrain",
     "id": "ranch_camp_76",
+    "vision_levels": "large_pavement",
     "name": "lot",
     "sym": "O",
     "color": "dark_gray",
@@ -218,16 +236,14 @@
   {
     "type": "overmap_terrain",
     "id": "ranch_camp_77",
-    "name": "road",
+    "copy-from": "road_abstract",
     "sym": "│",
-    "color": "dark_gray",
-    "see_cost": 2,
-    "travel_cost_type": "road",
     "extras": "road"
   },
   {
     "type": "overmap_terrain",
     "id": [ "ranch_camp_73", "ranch_camp_78" ],
+    "vision_levels": "open_land",
     "name": "ranch field",
     "sym": "└",
     "color": "brown",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_ravines.json b/data/json/overmap/overmap_terrain/overmap_terrain_ravines.json
index 72c93ab9d27f3..aa58fa6a9706d 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_ravines.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_ravines.json
@@ -2,6 +2,7 @@
   {
     "type": "overmap_terrain",
     "abstract": "generic_ravine",
+    "vision_levels": "always_full",
     "name": "ravine",
     "sym": ".",
     "color": "blue",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_recreational.json b/data/json/overmap/overmap_terrain/overmap_terrain_recreational.json
index 59ccb1d935205..2e0cf65c2e3a1 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_recreational.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_recreational.json
@@ -70,6 +70,7 @@
     "name": "pool",
     "sym": "O",
     "color": "blue",
+    "vision_levels": "single_water",
     "see_cost": 2,
     "mondensity": 2,
     "flags": [ "SIDEWALK", "SOURCE_DRINK" ]
@@ -154,6 +155,7 @@
     "name": "hunting blind",
     "sym": "H",
     "color": "i_green",
+    "vision_levels": "blends_till_details",
     "see_cost": 5,
     "mondensity": 2
   },
@@ -181,6 +183,7 @@
     "name": "community garden",
     "sym": "g",
     "color": "yellow",
+    "vision_levels": "blends_till_details",
     "see_cost": 5,
     "mondensity": 2,
     "flags": [ "SIDEWALK", "SOURCE_FARMING" ],
@@ -202,6 +205,7 @@
     "name": "botanical garden",
     "sym": "g",
     "color": "i_green",
+    "vision_levels": "city_building",
     "see_cost": 5,
     "mondensity": 2,
     "flags": [ "SIDEWALK", "SOURCE_FARMING" ]
@@ -209,6 +213,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "BotanicalGarden_1a_roof", "BotanicalGarden_1b_roof" ],
+    "vision_levels": "roof_or_air",
     "name": "botanical garden",
     "sym": "g",
     "color": "i_green",
@@ -218,6 +223,7 @@
   {
     "type": "overmap_terrain",
     "id": "TreeFarm_1a",
+    "vision_levels": "forested",
     "name": "tree farm",
     "sym": "T",
     "color": "i_green",
@@ -227,6 +233,7 @@
   {
     "type": "overmap_terrain",
     "id": "TreeFarm_1a_roof",
+    "vision_levels": "forested",
     "name": "tree farm",
     "sym": "T",
     "color": "i_green",
@@ -238,6 +245,7 @@
     "name": "shooting range",
     "sym": "S",
     "color": "red",
+    "vision_levels": "open_land",
     "see_cost": 5,
     "mondensity": 2,
     "flags": [ "SOURCE_GUN", "SOURCE_AMMO" ]
@@ -246,6 +254,7 @@
     "type": "overmap_terrain",
     "id": "shootingrange_1a_roof",
     "name": "shooting range roof",
+    "vision_levels": "roof_or_air",
     "sym": "S",
     "color": "red",
     "see_cost": 5,
@@ -263,6 +272,7 @@
       "miniaturerailway_1_0_1",
       "miniaturerailway_1_1_1"
     ],
+    "vision_levels": "isolated_building",
     "copy-from": "generic_city_building_no_sidewalk",
     "name": "miniature railway",
     "sym": "R",
@@ -285,6 +295,7 @@
       "luna_park_2_1_1"
     ],
     "copy-from": "generic_city_building_no_sidewalk",
+    "vision_levels": "isolated_building",
     "name": "miniature railway park",
     "sym": "P",
     "color": "light_green"
@@ -304,6 +315,7 @@
       "golfcourse_32"
     ],
     "copy-from": "generic_city_building_no_sidewalk",
+    "vision_levels": "open_land",
     "name": "golf course",
     "sym": "G",
     "color": "green"
@@ -313,12 +325,14 @@
     "id": "golfcourse_30",
     "copy-from": "generic_city_building_no_sidewalk",
     "name": "golf course parking lot",
+    "vision_levels": "large_pavement",
     "sym": "G",
     "color": "light_gray"
   },
   {
     "type": "overmap_terrain",
     "id": "golfcourse_31",
+    "vision_levels": "isolated_building",
     "copy-from": "generic_city_building_no_sidewalk",
     "name": "golf course service building",
     "sym": "G",
@@ -424,6 +438,7 @@
       "stadium_2_3"
     ],
     "copy-from": "generic_city_building",
+    "vision_levels": "blends_till_details",
     "name": "baseball field",
     "sym": "#",
     "color": "white"
@@ -466,6 +481,7 @@
       "stadium_football_6_4"
     ],
     "copy-from": "generic_city_building",
+    "vision_levels": "blends_till_details",
     "name": "football field",
     "sym": "O",
     "color": "light_green",
@@ -608,6 +624,7 @@
       "stadium_football_6_5_5"
     ],
     "copy-from": "generic_city_building",
+    "vision_levels": "large_city_building",
     "name": "stadium",
     "sym": "0",
     "color": "white"
@@ -624,6 +641,7 @@
       "stadium_2_1"
     ],
     "copy-from": "generic_city_building",
+    "vision_levels": "large_city_building",
     "name": "stadium entrance",
     "sym": "0",
     "color": "white"
@@ -643,6 +661,7 @@
       "stadium_football_6_3_1"
     ],
     "name": "open air",
+    "vision_levels": "roof_or_air",
     "sym": ".",
     "color": "blue",
     "see_cost": 1
@@ -650,6 +669,7 @@
   {
     "type": "overmap_terrain",
     "abstract": "generic_stadium_park",
+    "vision_levels": "large_pavement",
     "name": "stadium parking",
     "color": "dark_gray",
     "see_cost": 5,
@@ -818,6 +838,7 @@
       "movietheater_roof_2_2"
     ],
     "copy-from": "generic_city_building",
+    "vision_levels": "large_building",
     "name": "movie theater roof",
     "sym": "M",
     "color": "i_yellow"
@@ -844,6 +865,7 @@
       "car_theater_2_0_2"
     ],
     "copy-from": "generic_city_building_no_sidewalk",
+    "vision_levels": "large_pavement",
     "name": "drive-in theater",
     "sym": "M",
     "color": "i_yellow"
@@ -852,6 +874,7 @@
     "type": "overmap_terrain",
     "id": [ "car_theater_3_1", "car_theater_3_2", "car_theater_3_1_1", "car_theater_3_2_1", "car_theater_4_1", "car_theater_4_2" ],
     "copy-from": "generic_city_building_no_sidewalk",
+    "vision_levels": "isolated_building",
     "name": "drive-in theater entrance",
     "sym": "+",
     "color": "yellow"
@@ -859,11 +882,8 @@
   {
     "type": "overmap_terrain",
     "id": "car_theater_3_0",
-    "copy-from": "generic_transportation",
-    "name": "road",
-    "sym": "│",
-    "color": "dark_gray",
-    "see_cost": 2
+    "copy-from": "road_abstract",
+    "sym": "│"
   },
   {
     "type": "overmap_terrain",
@@ -1049,6 +1069,7 @@
     "type": "overmap_terrain",
     "id": "lake_dock_small",
     "copy-from": "generic_recreation_water",
+    "vision_levels": "blends_till_details",
     "name": "dock",
     "sym": "d",
     "color": "white",
@@ -1059,6 +1080,7 @@
     "type": "overmap_terrain",
     "id": "lake_shore_dock_small",
     "copy-from": "generic_recreation_water",
+    "vision_levels": "blends_till_details",
     "name": "dock",
     "sym": "d",
     "color": "white",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_residential.json b/data/json/overmap/overmap_terrain/overmap_terrain_residential.json
index 8b28306e0bcf3..b0f8c11a1d968 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_residential.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_residential.json
@@ -600,6 +600,7 @@
     "name": "apartment tower",
     "sym": "A",
     "color": "light_green",
+    "vision_levels": "large_city_building",
     "see_cost": 5,
     "mondensity": 2,
     "extras": "build",
@@ -609,6 +610,7 @@
   {
     "type": "overmap_terrain",
     "abstract": "apartments_tower_roof_any",
+    "vision_levels": "roof_or_air",
     "name": "apartment tower roof",
     "sym": "A",
     "color": "light_green",
@@ -747,6 +749,7 @@
     "type": "overmap_terrain",
     "id": [ "homelesscamp", "homelesscamp_npc" ],
     "copy-from": "generic_city_building_no_sidewalk",
+    "vision_levels": "blends_till_outlines",
     "name": "homeless camp",
     "sym": "H",
     "color": "green"
@@ -773,6 +776,7 @@
     "id": "derelict_property_roof",
     "type": "overmap_terrain",
     "name": "derelict property roof",
+    "vision_levels": "roof_or_air",
     "sym": ".",
     "color": "i_brown",
     "see_cost": 5,
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_retirement_community.json b/data/json/overmap/overmap_terrain/overmap_terrain_retirement_community.json
index f0f80dadccb30..c3117369eac8d 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_retirement_community.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_retirement_community.json
@@ -17,6 +17,7 @@
       "retirement_community_2f_6",
       "retirement_community_2f_7"
     ],
+    "vision_levels": "city_building",
     "name": "retirement home",
     "sym": "v",
     "color": "light_green"
@@ -32,6 +33,7 @@
       "retirement_community_3f_6",
       "retirement_community_3f_7"
     ],
+    "vision_levels": "roof_or_air",
     "name": "retirement home roof",
     "sym": "v",
     "color": "light_green"
@@ -55,6 +57,7 @@
       "retirement_community_2f_33",
       "retirement_community_2f_37"
     ],
+    "vision_levels": "always_full",
     "name": "open air",
     "sym": ".",
     "color": "blue"
@@ -76,6 +79,7 @@
       "retirement_community_b_23",
       "retirement_community_b_26"
     ],
+    "vision_levels": "always_full",
     "name": "basement",
     "sym": "O",
     "color": "dark_gray"
@@ -90,6 +94,7 @@
       "retirement_community_2f_19",
       "retirement_community_2f_23"
     ],
+    "vision_levels": "city_building",
     "name": "retirement home",
     "sym": ">",
     "color": "light_green"
@@ -97,6 +102,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "retirement_community_3f_15", "retirement_community_3f_19", "retirement_community_3f_23" ],
+    "vision_levels": "city_building",
     "name": "retirement home roof",
     "sym": ">",
     "color": "light_green"
@@ -111,16 +117,16 @@
       "retirement_community_20",
       "retirement_community_24"
     ],
-    "name": "road",
-    "sym": "│",
-    "color": "dark_gray"
+    "copy-from": "road_abstract",
+    "sym": "│"
   },
   {
     "type": "overmap_terrain",
     "id": [ "retirement_community_37", "retirement_community_road" ],
+    "copy-from": "road_abstract",
+    "vision_levels": "blends_till_details",
     "name": "retirement community entrance",
-    "sym": "│",
-    "color": "dark_gray"
+    "sym": "│"
   },
   {
     "type": "overmap_terrain",
@@ -132,6 +138,7 @@
       "retirement_community_2f_22",
       "retirement_community_2f_26"
     ],
+    "vision_levels": "city_building",
     "name": "retirement home",
     "sym": "<",
     "color": "light_green"
@@ -139,6 +146,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "retirement_community_3f_18", "retirement_community_3f_22", "retirement_community_3f_26" ],
+    "vision_levels": "roof_or_air",
     "name": "retirement home roof",
     "sym": "<",
     "color": "light_green"
@@ -146,6 +154,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "retirement_community_8", "retirement_community_14", "retirement_community_27", "retirement_community_33" ],
+    "vision_levels": "large_pavement",
     "name": "parking lot",
     "sym": "O",
     "color": "dark_gray"
@@ -159,27 +168,25 @@
       "retirement_community_29",
       "retirement_community_31"
     ],
-    "name": "road",
-    "sym": "─",
-    "color": "dark_gray"
+    "copy-from": "road_abstract",
+    "sym": "─"
   },
   {
     "type": "overmap_terrain",
     "id": [ "retirement_community_9", "retirement_community_13", "retirement_community_30" ],
-    "name": "road",
-    "sym": "┬",
-    "color": "dark_gray"
+    "copy-from": "road_abstract",
+    "sym": "┬"
   },
   {
     "type": "overmap_terrain",
     "id": [ "retirement_community_28", "retirement_community_32" ],
-    "name": "road",
-    "sym": "┴",
-    "color": "dark_gray"
+    "copy-from": "road_abstract",
+    "sym": "┴"
   },
   {
     "type": "overmap_terrain",
     "id": [ "retirement_community_34", "retirement_community_35", "retirement_community_36" ],
+    "vision_levels": "city_building",
     "name": "community building",
     "sym": "C",
     "color": "pink"
@@ -187,6 +194,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "retirement_community_38", "retirement_community_39", "retirement_community_40" ],
+    "vision_levels": "city_building",
     "name": "administration building",
     "sym": "A",
     "color": "light_gray"
@@ -194,6 +202,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "retirement_community_b_37", "retirement_community_b_38" ],
+    "vision_levels": "city_building",
     "name": "administration building basement",
     "sym": "A",
     "color": "light_gray"
@@ -201,6 +210,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "retirement_community_2f_34", "retirement_community_2f_35", "retirement_community_2f_36" ],
+    "vision_levels": "city_building",
     "name": "community building roof",
     "sym": "C",
     "color": "pink"
@@ -208,6 +218,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "retirement_community_2f_38", "retirement_community_2f_39", "retirement_community_2f_40" ],
+    "vision_levels": "city_building",
     "name": "administration building roof",
     "sym": "A",
     "color": "light_gray"
@@ -225,6 +236,7 @@
       "retirement_community_park_8",
       "retirement_community_park_9"
     ],
+    "vision_levels": "forested",
     "name": "retirement community park",
     "sym": "┼",
     "color": "green"
@@ -232,6 +244,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "retirement_community_park_2f_2", "retirement_community_park_2f_5" ],
+    "vision_levels": "always_full",
     "name": "open air",
     "sym": ".",
     "color": "blue"
@@ -249,6 +262,7 @@
       "retirement_community_park_b_8",
       "retirement_community_park_b_9"
     ],
+    "vision_levels": "city_building",
     "name": "retirement community park underground",
     "sym": "┼",
     "color": "brown"
@@ -256,6 +270,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "retirement_community_sewer" ],
+    "vision_levels": "city_building",
     "name": "sewer",
     "sym": "┐",
     "color": "green"
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_river.json b/data/json/overmap/overmap_terrain/overmap_terrain_river.json
index b46f4e09d1149..3ac3ee8a2c734 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_river.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_river.json
@@ -3,6 +3,7 @@
     "type": "overmap_terrain",
     "abstract": "generic_river",
     "copy-from": "generic_water",
+    "vision_levels": "water_body",
     "name": "river",
     "sym": "R",
     "color": "blue",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_robofachq.json b/data/json/overmap/overmap_terrain/overmap_terrain_robofachq.json
index e6061982f02d9..c0d32e24898d6 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_robofachq.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_robofachq.json
@@ -2,6 +2,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "robofachq_roof_a0", "robofachq_roof_a3" ],
+    "vision_levels": "roof_or_air",
     "name": "open air",
     "sym": ".",
     "color": "blue"
@@ -18,6 +19,7 @@
       "robofachq_meteorology_roof2",
       "robofachq_meteorology_roof3"
     ],
+    "vision_levels": "large_building",
     "name": "meteorology station",
     "sym": "m",
     "color": "yellow",
@@ -26,16 +28,16 @@
   {
     "type": "overmap_terrain",
     "id": [ "robofachq_surface_road0", "robofachq_surface_road1", "robofachq_surface_road2", "robofachq_surface_road3" ],
+    "copy-from": "road_abstract",
     "name": "meteorology station",
     "sym": "─",
-    "color": "dark_gray",
-    "see_cost": 1,
-    "travel_cost_type": "road"
+    "see_cost": 1
   },
   {
     "type": "overmap_terrain",
     "id": [ "robofachq_rock", "robofachq_roof_e" ],
     "name": "A buggy non-place",
+    "vision_levels": "underground_stone",
     "looks_like": "empty_rock",
     "sym": "%",
     "color": "dark_gray",
@@ -102,6 +104,7 @@
       "robofachq_aiutl_b2",
       "robofachq_aiutl_b3"
     ],
+    "vision_levels": "large_building",
     "name": "hub 01",
     "sym": "0",
     "color": "light_blue",
@@ -110,6 +113,7 @@
   {
     "type": "overmap_terrain",
     "id": "robofachq_surface_parking",
+    "vision_levels": "large_pavement",
     "name": "hub 01 parking space",
     "sym": "0",
     "color": "light_blue",
@@ -118,6 +122,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "robofachq_subcc_a0", "robofachq_subcc_a1", "robofachq_subcc_a2", "robofachq_subcc_a3" ],
+    "vision_levels": "underground_stone",
     "name": "subway C&C",
     "sym": "S",
     "color": "yellow",
@@ -126,6 +131,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "robofachq_subline_a0", "robofachq_subline_a1", "robofachq_subline_a2", "robofachq_subline_a3" ],
+    "vision_levels": "underground_stone",
     "name": "hidden terminal",
     "sym": "s",
     "color": "light_blue",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_special.json b/data/json/overmap/overmap_terrain/overmap_terrain_special.json
index 9621eacbd66b4..65c3b2a20a330 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_special.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_special.json
@@ -3,6 +3,7 @@
     "type": "overmap_terrain",
     "id": "special_deep_rock",
     "//": "For placing terrain lookalikes that unlike placing said terrain don't allow mapgen intended for the naturally found version",
+    "vision_levels": "always_full",
     "name": "solid rock",
     "looks_like": "deep_rock",
     "sym": "%",
@@ -13,6 +14,7 @@
   {
     "type": "overmap_terrain",
     "id": "special_rock",
+    "vision_levels": "always_full",
     "name": "solid rock",
     "sym": "%",
     "color": "dark_gray",
@@ -24,6 +26,7 @@
     "type": "overmap_terrain",
     "id": "special_earth",
     "name": "solid earth",
+    "vision_levels": "always_full",
     "sym": "#",
     "color": "brown",
     "looks_like": "solid_earth",
@@ -34,6 +37,7 @@
     "type": "overmap_terrain",
     "id": [ "special_field" ],
     "copy-from": "generic_open_land",
+    "vision_levels": "open_land",
     "name": "field",
     "sym": ".",
     "color": "brown",
@@ -70,6 +74,7 @@
   {
     "type": "overmap_terrain",
     "abstract": "generic_air",
+    "vision_levels": "roof_or_air",
     "name": "open air",
     "sym": ".",
     "color": "blue",
@@ -134,6 +139,7 @@
       "mil_base_8j1",
       "s_gas_g0_roof"
     ],
+    "vision_levels": "roof_or_air",
     "copy-from": "generic_air"
   },
   {
@@ -142,19 +148,10 @@
     "id": [ "lab_subway_vent_shaft_roof", "special_air" ],
     "flags": [ "NO_ROTATE" ]
   },
-  {
-    "type": "overmap_terrain",
-    "abstract": "generic_road",
-    "name": "road",
-    "looks_like": "road",
-    "color": "dark_gray",
-    "see_cost": 1,
-    "travel_cost_type": "road"
-  },
   {
     "type": "overmap_terrain",
     "id": "evac_center_1",
-    "copy-from": "generic_road",
+    "copy-from": "road_abstract",
     "sym": "┌"
   },
   {
@@ -170,13 +167,13 @@
       "mil_base_6j",
       "mil_base_7j"
     ],
-    "copy-from": "generic_road",
+    "copy-from": "road_abstract",
     "sym": "─"
   },
   {
     "type": "overmap_terrain",
     "id": "evac_center_5",
-    "copy-from": "generic_road",
+    "copy-from": "road_abstract",
     "sym": "┐"
   },
   {
@@ -199,31 +196,31 @@
       "mil_base_4h",
       "mil_base_4i"
     ],
-    "copy-from": "generic_road",
+    "copy-from": "road_abstract",
     "sym": "│"
   },
   {
     "type": "overmap_terrain",
     "id": [ "evac_center_23", "mil_base_6f" ],
-    "copy-from": "generic_road",
+    "copy-from": "road_abstract",
     "sym": "┬"
   },
   {
     "type": "overmap_terrain",
     "id": [ "evac_center_21", "mil_base_4j" ],
-    "copy-from": "generic_road",
+    "copy-from": "road_abstract",
     "sym": "└"
   },
   {
     "type": "overmap_terrain",
     "id": [ "mil_base_4a", "mil_base_4f" ],
-    "copy-from": "generic_road",
+    "copy-from": "road_abstract",
     "sym": "├"
   },
   {
     "type": "overmap_terrain",
     "id": "evac_center_25",
-    "copy-from": "generic_road",
+    "copy-from": "road_abstract",
     "sym": "┘"
   }
 ]
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_speedway.json b/data/json/overmap/overmap_terrain/overmap_terrain_speedway.json
index ec98e9fa35181..1da4a88b64865 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_speedway.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_speedway.json
@@ -40,99 +40,94 @@
   },
   {
     "type": "overmap_terrain",
-    "id": [ "speedway_1_0", "speedway_0_1" ],
+    "abstract": "speedway_track_abstract",
     "copy-from": "generic_city_building_no_sidewalk",
-    "name": "speedway",
-    "sym": "┌",
+    "vision_levels": "blends_till_outlines",
+    "name": "speedway"
+  },
+  {
+    "type": "overmap_terrain",
+    "abstract": "speedway_track_red",
+    "copy-from": "speedway_track_abstract",
     "color": "red"
   },
   {
     "type": "overmap_terrain",
-    "id": [ "speedway_6_4" ],
-    "copy-from": "generic_city_building_no_sidewalk",
-    "name": "speedway",
-    "sym": "┌",
+    "abstract": "speedway_track_white",
+    "copy-from": "speedway_track_abstract",
     "color": "white"
   },
+  {
+    "type": "overmap_terrain",
+    "id": [ "speedway_1_0", "speedway_0_1" ],
+    "copy-from": "speedway_track_red",
+    "sym": "┌"
+  },
+  {
+    "type": "overmap_terrain",
+    "id": [ "speedway_6_4" ],
+    "copy-from": "speedway_track_white",
+    "sym": "┌"
+  },
   {
     "type": "overmap_terrain",
     "id": [ "speedway_0_4", "speedway_1_5" ],
-    "copy-from": "generic_city_building_no_sidewalk",
-    "name": "speedway",
-    "sym": "└",
-    "color": "white"
+    "copy-from": "speedway_track_white",
+    "sym": "└"
   },
   {
     "type": "overmap_terrain",
     "id": [ "speedway_6_1" ],
-    "copy-from": "generic_city_building_no_sidewalk",
-    "name": "speedway",
-    "sym": "└",
-    "color": "red"
+    "copy-from": "speedway_track_red",
+    "sym": "└"
   },
   {
     "type": "overmap_terrain",
     "id": [ "speedway_7_4", "speedway_6_5" ],
-    "copy-from": "generic_city_building_no_sidewalk",
-    "name": "speedway",
-    "sym": "┘",
-    "color": "red"
+    "copy-from": "speedway_track_red",
+    "sym": "┘"
   },
   {
     "type": "overmap_terrain",
     "id": [ "speedway_1_1" ],
-    "copy-from": "generic_city_building_no_sidewalk",
-    "name": "speedway",
-    "sym": "┘",
-    "color": "white"
+    "copy-from": "speedway_track_white",
+    "sym": "┘"
   },
   {
     "type": "overmap_terrain",
     "id": [ "speedway_6_0", "speedway_7_1" ],
-    "copy-from": "generic_city_building_no_sidewalk",
-    "name": "speedway",
-    "sym": "┐",
-    "color": "white"
+    "copy-from": "speedway_track_white",
+    "sym": "┐"
   },
   {
     "type": "overmap_terrain",
     "id": [ "speedway_1_4" ],
-    "copy-from": "generic_city_building_no_sidewalk",
-    "name": "speedway",
-    "sym": "┐",
-    "color": "red"
+    "copy-from": "speedway_track_red",
+    "sym": "┐"
   },
   {
     "type": "overmap_terrain",
     "id": [ "speedway_2_0", "speedway_4_0", "speedway_3_5", "speedway_5_5" ],
-    "copy-from": "generic_city_building_no_sidewalk",
-    "name": "speedway",
-    "sym": "─",
-    "color": "white"
+    "copy-from": "speedway_track_white",
+    "sym": "─"
   },
   {
     "type": "overmap_terrain",
     "id": [ "speedway_3_0", "speedway_5_0", "speedway_2_5", "speedway_4_5" ],
-    "copy-from": "generic_city_building_no_sidewalk",
-    "name": "speedway",
-    "sym": "─",
-    "color": "red"
+    "copy-from": "speedway_track_red",
+    "sym": "─"
   },
   {
     "type": "overmap_terrain",
     "id": [ "speedway_0_2", "speedway_7_3" ],
-    "copy-from": "generic_city_building_no_sidewalk",
-    "name": "speedway",
-    "sym": "│",
-    "color": "white"
+    "copy-from": "speedway_track_white",
+    "sym": "│"
   },
   {
     "type": "overmap_terrain",
     "id": [ "speedway_0_3", "speedway_7_2" ],
-    "copy-from": "generic_city_building_no_sidewalk",
-    "name": "speedway",
-    "sym": "│",
-    "color": "red"
+    "copy-from": "speedway_track_red",
+    "sym": "│"
   },
   {
     "type": "overmap_terrain",
@@ -149,57 +144,56 @@
       "speedway_5_6_1"
     ],
     "copy-from": "generic_city_building_no_sidewalk",
+    "vision_levels": "large_building",
     "name": "bleachers",
     "sym": "^",
     "color": "light_blue"
   },
+  {
+    "type": "overmap_terrain",
+    "abstract": "speedway_road_abstract",
+    "copy-from": "road_abstract",
+    "color": "light_gray",
+    "see_cost": 5,
+    "extras": "build",
+    "mondensity": 2,
+    "flags": [ "RISK_HIGH", "GENERIC_LOOT" ]
+  },
   {
     "type": "overmap_terrain",
     "id": [ "speedway_8_2", "speedway_8_3", "speedway_8_4", "speedway_8_6", "speedway_5_9" ],
-    "copy-from": "generic_city_building_no_sidewalk",
-    "name": "road",
-    "sym": "│",
-    "color": "light_gray"
+    "copy-from": "speedway_road_abstract",
+    "sym": "│"
   },
   {
     "type": "overmap_terrain",
     "id": [ "speedway_7_5", "speedway_6_7", "speedway_7_7" ],
-    "copy-from": "generic_city_building_no_sidewalk",
-    "name": "road",
-    "sym": "─",
-    "color": "light_gray"
+    "copy-from": "speedway_road_abstract",
+    "sym": "─"
   },
   {
     "type": "overmap_terrain",
     "id": [ "speedway_8_7" ],
-    "copy-from": "generic_city_building_no_sidewalk",
-    "name": "road",
-    "sym": "┘",
-    "color": "light_gray"
+    "copy-from": "speedway_road_abstract",
+    "sym": "┘"
   },
   {
     "type": "overmap_terrain",
     "id": [ "speedway_8_1" ],
-    "copy-from": "generic_city_building_no_sidewalk",
-    "name": "road",
-    "sym": "┐",
-    "color": "light_gray"
+    "copy-from": "speedway_road_abstract",
+    "sym": "┐"
   },
   {
     "type": "overmap_terrain",
     "id": [ "speedway_8_5", "speedway_5_8" ],
-    "copy-from": "generic_city_building_no_sidewalk",
-    "name": "road",
-    "sym": "┤",
-    "color": "light_gray"
+    "copy-from": "speedway_road_abstract",
+    "sym": "┤"
   },
   {
     "type": "overmap_terrain",
     "id": [ "speedway_5_7" ],
-    "copy-from": "generic_city_building_no_sidewalk",
-    "name": "road",
-    "sym": "├",
-    "color": "light_gray"
+    "copy-from": "speedway_road_abstract",
+    "sym": "├"
   },
   {
     "type": "overmap_terrain",
@@ -218,6 +212,7 @@
       "speedway_4_9"
     ],
     "copy-from": "generic_city_building_no_sidewalk",
+    "vision_levels": "large_pavement",
     "name": "parking lot",
     "sym": "O",
     "color": "dark_gray"
@@ -226,6 +221,7 @@
     "type": "overmap_terrain",
     "id": [ "speedway_9_3", "speedway_9_4", "speedway_9_5", "speedway_9_3_1", "speedway_9_4_1", "speedway_9_5_1" ],
     "copy-from": "generic_city_building_no_sidewalk",
+    "vision_levels": "isolated_building",
     "name": "garage",
     "sym": "O",
     "color": "white"
@@ -233,9 +229,9 @@
   {
     "type": "overmap_terrain",
     "id": [ "speedway_6_7_1", "speedway_6_7_2", "speedway_6_7_3" ],
-    "copy-from": "generic_city_building_no_sidewalk",
+    "copy-from": "speedway_road_abstract",
+    "vision_levels": "isolated_building",
     "name": "announcer station",
-    "sym": "─",
-    "color": "light_gray"
+    "sym": "─"
   }
 ]
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_stream.json b/data/json/overmap/overmap_terrain/overmap_terrain_stream.json
index ae42dd9a2c4ef..853c63f038748 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_stream.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_stream.json
@@ -6,6 +6,7 @@
     "name": "stream",
     "sym": ".",
     "color": "light_blue",
+    "vision_levels": "blends_till_details",
     "flags": [ "REQUIRES_PREDECESSOR" ]
   }
 ]
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_transportation.json b/data/json/overmap/overmap_terrain/overmap_terrain_transportation.json
index 2fcd75c6b7f70..dc1020feff78b 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_transportation.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_transportation.json
@@ -1,24 +1,29 @@
 [
   {
     "type": "overmap_terrain",
-    "id": "road",
+    "abstract": "road_abstract",
     "name": "road",
     "copy-from": "generic_transportation",
     "color": "dark_gray",
     "see_cost": 2,
     "travel_cost_type": "road",
+    "looks_like": "road",
+    "vision_levels": "blends_till_outlines"
+  },
+  {
+    "type": "overmap_terrain",
+    "id": "road",
+    "copy-from": "road_abstract",
     "extras": "road",
     "flags": [ "LINEAR", "REQUIRES_PREDECESSOR" ]
   },
   {
     "type": "overmap_terrain",
     "id": "road_nesw_manhole",
-    "copy-from": "generic_transportation",
+    "copy-from": "road_abstract",
     "name": "road, manhole",
     "sym": "┼",
     "color": "yellow",
-    "see_cost": 2,
-    "travel_cost_type": "road",
     "extras": "road_nesw_manhole",
     "flags": [ "KNOWN_DOWN", "NO_ROTATE" ]
   },
@@ -75,6 +80,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "roadstop", "roadstop_roof" ],
+    "vision_levels": "isolated_building",
     "name": "roadstop",
     "sym": "^",
     "color": "light_blue",
@@ -83,6 +89,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "roadstop_a", "roadstop_a_roof" ],
+    "vision_levels": "isolated_building",
     "name": "public washroom",
     "sym": "^",
     "color": "light_blue",
@@ -91,6 +98,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "roadstop_b", "roadstop_b_roof" ],
+    "vision_levels": "isolated_building",
     "name": "roadside foodcart",
     "sym": "^",
     "color": "magenta",
@@ -101,6 +109,7 @@
     "id": "forest_trail",
     "name": "forest trail",
     "color": "green",
+    "vision_levels": "forested",
     "flags": [ "LINEAR", "REQUIRES_PREDECESSOR" ],
     "land_use_code": "forest"
   },
@@ -108,6 +117,7 @@
     "type": "overmap_terrain",
     "id": [ "trailhead", "trailhead_shack_z0", "trailhead_outhouse_z0" ],
     "name": "trailhead",
+    "vision_levels": "blends_till_details",
     "sym": "T",
     "color": "brown"
   },
@@ -121,6 +131,7 @@
     "type": "overmap_terrain",
     "id": "sub_station",
     "name": "subway station",
+    "vision_levels": "city_building",
     "sym": "S",
     "color": "yellow",
     "see_cost": 5,
@@ -132,6 +143,7 @@
     "type": "overmap_terrain",
     "id": "sub_station_roof",
     "name": "subway station roof",
+    "vision_levels": "roof_or_air",
     "sym": "S",
     "color": "yellow",
     "see_cost": 5,
@@ -143,6 +155,7 @@
     "type": "overmap_terrain",
     "id": "sewer_sub_station",
     "name": "subway station (sewer level)",
+    "vision_levels": "underground_dirt",
     "sym": "S",
     "color": "yellow",
     "see_cost": 5,
@@ -153,6 +166,7 @@
     "type": "overmap_terrain",
     "id": "underground_sub_station",
     "name": "subway station (underground level)",
+    "vision_levels": "underground_stone",
     "sym": "S",
     "color": "yellow",
     "see_cost": 5,
@@ -163,6 +177,7 @@
     "type": "overmap_terrain",
     "id": "subway",
     "name": "subway",
+    "vision_levels": "underground_stone",
     "color": "dark_gray",
     "see_cost": 5,
     "extras": "subway",
@@ -179,6 +194,7 @@
     "type": "overmap_terrain",
     "id": "lab_subway",
     "name": "subway",
+    "vision_levels": "underground_stone",
     "color": "dark_gray",
     "see_cost": 5,
     "extras": "lab_subway",
@@ -195,6 +211,7 @@
     "type": "overmap_terrain",
     "id": [ "sub_ramp_above", "sub_ramp_below" ],
     "name": "subway ramp",
+    "vision_levels": "underground_stone",
     "sym": "S",
     "color": "dark_gray",
     "see_cost": 5
@@ -203,6 +220,7 @@
     "type": "overmap_terrain",
     "id": [ "s_reststop_1", "s_reststop_2" ],
     "copy-from": "generic_city_building_no_sidewalk",
+    "vision_levels": "isolated_building",
     "name": "rest area",
     "sym": "#",
     "color": "blue"
@@ -211,6 +229,7 @@
     "type": "overmap_terrain",
     "id": [ "s_reststop_1_roof", "s_reststop_2_roof" ],
     "copy-from": "generic_city_building",
+    "vision_levels": "roof_or_air",
     "name": "rest area roof",
     "sym": "#",
     "color": "blue"
@@ -219,6 +238,7 @@
     "type": "overmap_terrain",
     "id": [ "s_restparking_1", "s_restparking_2" ],
     "copy-from": "generic_city_building_no_sidewalk",
+    "vision_levels": "large_pavement",
     "name": "rest area parking",
     "sym": "+",
     "color": "dark_gray"
@@ -226,6 +246,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "control_tower_0", "control_tower_1", "control_tower_2", "s_air_atc", "s_air_atc_2", "s_air_atc_3", "s_air_atc_4" ],
+    "vision_levels": "isolated_tower",
     "name": "control tower",
     "sym": "X",
     "color": "i_light_gray",
@@ -236,6 +257,7 @@
     "type": "overmap_terrain",
     "id": "control_tower_roof",
     "name": "control tower roof",
+    "vision_levels": "roof_or_air",
     "sym": "X",
     "color": "i_light_gray",
     "see_cost": 5,
@@ -259,6 +281,7 @@
       "s_air_runway_r"
     ],
     "name": "runway",
+    "vision_levels": "blends_till_outlines",
     "sym": "─",
     "color": "light_gray",
     "see_cost": 5,
@@ -267,6 +290,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "runway_fuel", "runway_fuel2" ],
+    "vision_levels": "blends_till_outlines",
     "name": "runway",
     "sym": "─",
     "color": "light_gray",
@@ -277,6 +301,7 @@
   {
     "type": "overmap_terrain",
     "id": "fuel_station",
+    "vision_levels": "large_pavement",
     "name": "fuel station",
     "sym": ".",
     "color": "dark_gray",
@@ -287,6 +312,7 @@
   {
     "type": "overmap_terrain",
     "id": "fuel_station_roof",
+    "vision_levels": "roof_or_air",
     "name": "fuel station roof",
     "sym": ".",
     "color": "dark_gray",
@@ -296,6 +322,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "airport_lot_0", "airport_lot_1", "s_air_parking" ],
+    "vision_levels": "large_pavement",
     "name": "parking lot",
     "sym": "O",
     "color": "dark_gray",
@@ -305,6 +332,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "hangar", "s_air_hangars" ],
+    "vision_levels": "isolated_building",
     "name": "small hangar",
     "sym": "O",
     "color": "white",
@@ -314,6 +342,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "hangar_roof", "s_air_hangars_roof" ],
+    "vision_levels": "roof_or_air",
     "name": "small hangar roof",
     "sym": "O",
     "color": "white",
@@ -323,6 +352,7 @@
   {
     "type": "overmap_terrain",
     "id": "s_air_term",
+    "vision_levels": "isolated_building",
     "name": "private airport terminal",
     "sym": "A",
     "color": "light_gray",
@@ -333,6 +363,7 @@
   {
     "type": "overmap_terrain",
     "id": "s_air_term_roof",
+    "vision_levels": "roof_or_air",
     "name": "private airport terminal roof",
     "sym": "A",
     "color": "light_gray",
@@ -355,6 +386,7 @@
   {
     "type": "overmap_terrain",
     "id": "s_air_helicopter_pad",
+    "vision_levels": "large_pavement",
     "name": "helicopter pad",
     "sym": "H",
     "color": "white",
@@ -366,6 +398,7 @@
     "type": "overmap_terrain",
     "id": [ "bus_stat_0", "bus_stat_1" ],
     "name": "bus station",
+    "vision_levels": "large_pavement",
     "sym": "B",
     "color": "i_light_cyan",
     "see_cost": 2,
@@ -375,6 +408,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "bus_stat_0_roof", "bus_stat_1_roof" ],
+    "vision_levels": "roof_or_air",
     "name": "bus station roof",
     "sym": "B",
     "color": "i_light_cyan",
@@ -413,6 +447,7 @@
       "parking_garage_roof_top"
     ],
     "name": "parking garage",
+    "vision_levels": "city_building",
     "sym": "O",
     "color": "dark_gray",
     "see_cost": 5,
@@ -447,6 +482,7 @@
       "parking_3x1_2"
     ],
     "copy-from": "generic_city_building",
+    "vision_levels": "large_pavement",
     "name": "parking lot",
     "sym": "O",
     "color": "dark_gray"
@@ -454,18 +490,16 @@
   {
     "type": "overmap_terrain",
     "id": [ "s_lot_no_sidewalk", "trailer_hub_00" ],
+    "vision_levels": "large_pavement",
     "copy-from": "s_lot",
     "delete": { "flags": [ "SIDEWALK" ] }
   },
   {
     "type": "overmap_terrain",
     "id": [ "trailer_road", "trailer_road_1parkway", "trailer_road_2parkway" ],
-    "copy-from": "generic_transportation",
+    "copy-from": "road_abstract",
     "extras": "road",
-    "name": "road",
-    "sym": "│",
-    "travel_cost_type": "road",
-    "color": "light_gray"
+    "sym": "│"
   },
   {
     "type": "overmap_terrain",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_triffid.json b/data/json/overmap/overmap_terrain/overmap_terrain_triffid.json
index 5ea0f0eeac51e..d061f9738678c 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_triffid.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_triffid.json
@@ -4,6 +4,7 @@
     "id": "triffid_grove",
     "name": "triffid grove",
     "copy-from": "generic_forest",
+    "vision_levels": "unusual_structure",
     "sym": "T",
     "color": "light_red",
     "see_cost": 5,
@@ -12,95 +13,18 @@
   },
   {
     "type": "overmap_terrain",
-    "id": "triffid_roots",
-    "name": "triffid roots",
-    "sym": "T",
-    "color": "light_red",
-    "see_cost": 5,
-    "mondensity": 2,
-    "spawns": { "group": "GROUP_TRIFFID", "population": [ 40, 45 ], "chance": 80 },
-    "flags": [ "KNOWN_UP", "KNOWN_DOWN", "RISK_EXTREME" ]
-  },
-  {
-    "type": "overmap_terrain",
-    "id": "triffid_rootss",
-    "name": "triffid roots",
-    "sym": "T",
-    "color": "light_red",
-    "see_cost": 5,
-    "mondensity": 2,
-    "spawns": { "group": "GROUP_TRIFFID", "population": [ 40, 45 ], "chance": 80 },
-    "flags": [ "KNOWN_UP", "KNOWN_DOWN", "RISK_EXTREME" ]
-  },
-  {
-    "type": "overmap_terrain",
-    "id": "triffid_rootsn",
-    "name": "triffid roots",
-    "sym": "T",
-    "color": "light_red",
-    "see_cost": 5,
-    "mondensity": 2,
-    "spawns": { "group": "GROUP_TRIFFID", "population": [ 40, 45 ], "chance": 80 },
-    "flags": [ "KNOWN_UP", "KNOWN_DOWN", "RISK_EXTREME" ]
-  },
-  {
-    "type": "overmap_terrain",
-    "id": "triffid_rootse",
-    "name": "triffid roots",
-    "sym": "T",
-    "color": "light_red",
-    "see_cost": 5,
-    "mondensity": 2,
-    "spawns": { "group": "GROUP_TRIFFID", "population": [ 40, 45 ], "chance": 80 },
-    "flags": [ "KNOWN_UP", "KNOWN_DOWN", "RISK_EXTREME" ]
-  },
-  {
-    "type": "overmap_terrain",
-    "id": "triffid_rootsw",
-    "name": "triffid roots",
-    "sym": "T",
-    "color": "light_red",
-    "see_cost": 5,
-    "mondensity": 2,
-    "spawns": { "group": "GROUP_TRIFFID", "population": [ 40, 45 ], "chance": 80 },
-    "flags": [ "KNOWN_UP", "KNOWN_DOWN", "RISK_EXTREME" ]
-  },
-  {
-    "type": "overmap_terrain",
-    "id": "triffid_rootsen",
-    "name": "triffid roots",
-    "sym": "T",
-    "color": "light_red",
-    "see_cost": 5,
-    "mondensity": 2,
-    "spawns": { "group": "GROUP_TRIFFID", "population": [ 40, 45 ], "chance": 80 },
-    "flags": [ "KNOWN_UP", "KNOWN_DOWN", "RISK_EXTREME" ]
-  },
-  {
-    "type": "overmap_terrain",
-    "id": "triffid_rootsnw",
-    "name": "triffid roots",
-    "sym": "T",
-    "color": "light_red",
-    "see_cost": 5,
-    "mondensity": 2,
-    "spawns": { "group": "GROUP_TRIFFID", "population": [ 40, 45 ], "chance": 80 },
-    "flags": [ "KNOWN_UP", "KNOWN_DOWN", "RISK_EXTREME" ]
-  },
-  {
-    "type": "overmap_terrain",
-    "id": "triffid_rootssw",
-    "name": "triffid roots",
-    "sym": "T",
-    "color": "light_red",
-    "see_cost": 5,
-    "mondensity": 2,
-    "spawns": { "group": "GROUP_TRIFFID", "population": [ 40, 45 ], "chance": 80 },
-    "flags": [ "KNOWN_UP", "KNOWN_DOWN", "RISK_EXTREME" ]
-  },
-  {
-    "type": "overmap_terrain",
-    "id": "triffid_rootsse",
+    "vision_levels": "underground_dirt",
+    "id": [
+      "triffid_roots",
+      "triffid_rootss",
+      "triffid_rootsn",
+      "triffid_rootse",
+      "triffid_rootsw",
+      "triffid_rootsen",
+      "triffid_rootsnw",
+      "triffid_rootssw",
+      "triffid_rootsse"
+    ],
     "name": "triffid roots",
     "sym": "T",
     "color": "light_red",
@@ -112,6 +36,7 @@
   {
     "type": "overmap_terrain",
     "id": "triffid_finale",
+    "vision_levels": "underground_dirt",
     "name": "triffid heart",
     "sym": "T",
     "color": "red",
@@ -122,16 +47,8 @@
   },
   {
     "type": "overmap_terrain",
-    "id": "triffid_grove_z3",
-    "name": "triffid grove trunk",
-    "sym": "T",
-    "color": "light_red",
-    "see_cost": 5,
-    "flags": [ "KNOWN_UP", "KNOWN_DOWN", "RISK_EXTREME" ]
-  },
-  {
-    "type": "overmap_terrain",
-    "id": "triffid_grove_z2",
+    "id": [ "triffid_grove_z3", "triffid_grove_z2" ],
+    "vision_levels": "unusual_structure",
     "name": "triffid grove trunk",
     "sym": "T",
     "color": "light_red",
@@ -141,6 +58,7 @@
   {
     "type": "overmap_terrain",
     "id": "triffid_grove_roof",
+    "vision_levels": "roof_or_air",
     "name": "triffid grove roof",
     "sym": "T",
     "color": "light_red",
@@ -150,6 +68,7 @@
   {
     "type": "overmap_terrain",
     "id": "triffid_field",
+    "vision_levels": "unusual_structure",
     "name": "vibrant field",
     "copy-from": "generic_forest",
     "sym": ".",
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_waste_junk.json b/data/json/overmap/overmap_terrain/overmap_terrain_waste_junk.json
index bb06120c94dae..0ada5ca83ce9a 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_waste_junk.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_waste_junk.json
@@ -2,6 +2,7 @@
   {
     "type": "overmap_terrain",
     "abstract": "generic_sewer",
+    "vision_levels": "underground_dirt",
     "name": "sewer",
     "color": "green",
     "see_cost": 5,
@@ -30,6 +31,7 @@
     "type": "overmap_terrain",
     "id": [ "sewage_treatment_0_0_0", "sewage_treatment_1_0_0", "sewage_treatment_1_1_0" ],
     "name": "sewage treatment plant",
+    "vision_levels": "isolated_building",
     "sym": "P",
     "color": "red",
     "see_cost": 5,
@@ -38,6 +40,7 @@
   {
     "type": "overmap_terrain",
     "id": "sewage_treatment_0_0_roof",
+    "vision_levels": "always_full",
     "name": "open air",
     "sym": ".",
     "color": "blue",
@@ -47,6 +50,7 @@
     "type": "overmap_terrain",
     "id": [ "sewage_treatment_1_0_roof", "sewage_treatment_1_1_roof", "sewage_treatment_1_0_upper_roof" ],
     "name": "sewage treatment plant roof",
+    "vision_levels": "isolated_building",
     "sym": "P",
     "color": "red",
     "see_cost": 5
@@ -57,6 +61,7 @@
     "name": "sewage treatment plant",
     "sym": "O",
     "color": "blue",
+    "vision_levels": "single_water",
     "see_cost": 5,
     "flags": [ "KNOWN_DOWN" ]
   },
@@ -66,6 +71,7 @@
     "name": "sewage treatment plant roof",
     "sym": "O",
     "color": "blue",
+    "vision_levels": "roof_or_air",
     "see_cost": 5
   },
   {
@@ -81,6 +87,7 @@
     "name": "sewage treatment plant - underground",
     "sym": "P",
     "color": "green",
+    "vision_levels": "underground_dirt",
     "see_cost": 5,
     "extras": "build",
     "flags": [ "KNOWN_UP" ]
@@ -91,6 +98,7 @@
     "name": "toxic waste dump",
     "sym": "D",
     "color": "pink",
+    "vision_levels": "isolated_building",
     "see_cost": 2,
     "flags": [ "RISK_HIGH" ]
   },
@@ -113,6 +121,7 @@
     "name": "hazardous waste sarcophagus",
     "sym": "X",
     "color": "pink",
+    "vision_levels": "isolated_building",
     "see_cost": 5,
     "flags": [ "RISK_HIGH" ]
   },
@@ -120,6 +129,7 @@
     "type": "overmap_terrain",
     "id": "pump_station_1",
     "copy-from": "generic_city_building",
+    "vision_levels": "isolated_building",
     "name": "pump station",
     "sym": "P",
     "color": "red",
@@ -129,6 +139,7 @@
     "type": "overmap_terrain",
     "id": [ "pump_station_1_roof", "pump_station_2_roof" ],
     "copy-from": "generic_city_building",
+    "vision_levels": "roof_or_air",
     "name": "pump station roof",
     "sym": "P",
     "color": "red",
@@ -138,6 +149,7 @@
     "type": "overmap_terrain",
     "id": "pump_station_2",
     "copy-from": "generic_city_building",
+    "vision_levels": "isolated_building",
     "name": "pump station",
     "sym": "P",
     "color": "red",
@@ -147,6 +159,7 @@
     "type": "overmap_terrain",
     "id": [ "pump_station_3", "pump_station_4", "pump_station_5" ],
     "name": "pump station",
+    "vision_levels": "isolated_building",
     "sym": "P",
     "color": "green",
     "see_cost": 999,
diff --git a/data/json/overmap/overmap_terrain/overmap_terrain_waterbody.json b/data/json/overmap/overmap_terrain/overmap_terrain_waterbody.json
index 99ec72599e70b..5c679dae2bbcd 100644
--- a/data/json/overmap/overmap_terrain/overmap_terrain_waterbody.json
+++ b/data/json/overmap/overmap_terrain/overmap_terrain_waterbody.json
@@ -3,6 +3,7 @@
     "type": "overmap_terrain",
     "abstract": "generic_lake",
     "copy-from": "generic_water",
+    "vision_levels": "water_body",
     "name": "lake",
     "sym": "#",
     "color": "blue",
@@ -43,6 +44,7 @@
     "type": "overmap_terrain",
     "abstract": "generic_ocean",
     "copy-from": "generic_water",
+    "vision_levels": "water_body",
     "name": "ocean",
     "sym": "#",
     "color": "blue",
diff --git a/data/json/overmap/overmap_terrain/overmap_vitrified_terrain.json b/data/json/overmap/overmap_terrain/overmap_vitrified_terrain.json
index 0b55339fa8c5d..a26d6daa1bf5e 100644
--- a/data/json/overmap/overmap_terrain/overmap_vitrified_terrain.json
+++ b/data/json/overmap/overmap_terrain/overmap_vitrified_terrain.json
@@ -3,6 +3,7 @@
     "type": "overmap_terrain",
     "id": [ "unvitrified_farm_1", "unvitrified_farm_2", "unvitrified_farm_neg_1", "unvitrified_farm_0" ],
     "name": "quiet farmstead",
+    "vision_levels": "isolated_building",
     "sym": "G",
     "color": "i_light_gray",
     "flags": [ "NO_ROTATE" ],
@@ -11,6 +12,7 @@
   {
     "type": "overmap_terrain",
     "id": [ "unvitrified_orchard" ],
+    "vision_levels": "first_glance_forest",
     "name": "quiet orchard",
     "sym": "G",
     "color": "i_light_gray",
diff --git a/data/json/overmap/overmap_terrain/river_cave.json b/data/json/overmap/overmap_terrain/river_cave.json
index df6b2ed4ca24e..faa9e8ae3094c 100644
--- a/data/json/overmap/overmap_terrain/river_cave.json
+++ b/data/json/overmap/overmap_terrain/river_cave.json
@@ -3,6 +3,7 @@
     "type": "overmap_terrain",
     "id": "c_cave_entrance",
     "name": "river cave entrance",
+    "vision_levels": "natural_outcropping",
     "sym": "O",
     "color": "light_cyan",
     "see_cost": 2,
@@ -12,6 +13,7 @@
     "type": "overmap_terrain",
     "id": "river_cave_food",
     "name": "kraken food storage",
+    "vision_levels": "underground_dirt",
     "sym": "O",
     "color": "cyan_green",
     "see_cost": 5,
@@ -35,6 +37,7 @@
     "type": "overmap_terrain",
     "id": "river_cave",
     "name": "river cave tunnel",
+    "vision_levels": "underground_dirt",
     "color": "brown",
     "see_cost": 5,
     "spawns": { "group": "GROUP_KRAKEN", "population": [ 4, 6 ], "chance": 100 },
diff --git a/data/json/overmap/vision_levels.json b/data/json/overmap/vision_levels.json
new file mode 100644
index 0000000000000..66ccc93b47adb
--- /dev/null
+++ b/data/json/overmap/vision_levels.json
@@ -0,0 +1,203 @@
+[
+  {
+    "id": "default",
+    "type": "oter_vision",
+    "levels": [  ]
+  },
+  {
+    "id": "always_full",
+    "type": "oter_vision",
+    "levels": [  ]
+  },
+  {
+    "id": "isolated_building",
+    "type": "oter_vision",
+    "levels": [
+      { "name": "building", "sym": "^", "color": "light_gray", "looks_like": "cabin" },
+      { "name": "building", "sym": "^", "color": "light_gray", "looks_like": "cabin" },
+      { "name": "building", "sym": "^", "color": "light_gray", "looks_like": "cabin" }
+    ]
+  },
+  {
+    "id": "city_building",
+    "type": "oter_vision",
+    "levels": [
+      { "name": "city", "sym": "#", "color": "light_gray" },
+      { "name": "city building", "sym": "O", "color": "light_gray" },
+      { "name": "city building", "sym": "O", "color": "light_gray" }
+    ]
+  },
+  {
+    "id": "isolated_tower",
+    "type": "oter_vision",
+    "levels": [ { "name": "tower", "sym": "0", "color": "light_gray" }, { "name": "tower", "sym": "0", "color": "light_gray" } ]
+  },
+  {
+    "id": "island",
+    "type": "oter_vision",
+    "levels": [ { "blends_adjacent": true }, { "name": "island", "sym": "o", "color": "brown" } ]
+  },
+  {
+    "id": "wreckage",
+    "type": "oter_vision",
+    "levels": [ { "name": "wreckage", "sym": "^", "color": "dark_gray" }, { "name": "wreckage", "sym": "^", "color": "dark_gray" } ]
+  },
+  {
+    "id": "forested",
+    "type": "oter_vision",
+    "levels": [
+      { "name": "forest", "sym": "F", "color": "green", "looks_like": "forest_thick" },
+      { "name": "forest", "sym": "F", "color": "green", "looks_like": "forest_thick" },
+      { "name": "forest", "sym": "F", "color": "green", "looks_like": "forest_thick" }
+    ]
+  },
+  {
+    "id": "first_glance_forest",
+    "type": "oter_vision",
+    "levels": [
+      { "name": "forest", "sym": "F", "color": "green", "looks_like": "forest_thick" },
+      { "name": "managed forest", "sym": "F", "color": "green", "looks_like": "forest" }
+    ]
+  },
+  {
+    "id": "forested_swampy",
+    "type": "oter_vision",
+    "levels": [
+      { "name": "forest", "sym": "F", "color": "green", "looks_like": "forest_thick" },
+      { "name": "swamp", "sym": "F", "color": "cyan", "looks_like": "forest_water" },
+      { "name": "swamp", "sym": "F", "color": "cyan", "looks_like": "forest_water" }
+    ]
+  },
+  {
+    "id": "open_land",
+    "type": "oter_vision",
+    "levels": [
+      { "name": "field", "sym": ".", "color": "brown", "looks_like": "field" },
+      { "name": "field", "sym": ".", "color": "brown", "looks_like": "field" }
+    ]
+  },
+  {
+    "id": "farm_field",
+    "type": "oter_vision",
+    "levels": [
+      { "name": "field", "sym": ".", "color": "brown", "looks_like": "field" },
+      { "name": "farm field", "sym": "#", "color": "i_brown" }
+    ]
+  },
+  {
+    "id": "large_pavement",
+    "type": "oter_vision",
+    "levels": [ { "blends_adjacent": true }, { "name": "pavement", "sym": "O", "color": "dark_gray", "looks_like": "s_lot" } ]
+  },
+  {
+    "id": "single_water",
+    "type": "oter_vision",
+    "levels": [
+      { "name": "water", "sym": "O", "color": "blue", "looks_like": "pond_field" },
+      { "name": "water", "sym": "O", "color": "blue", "looks_like": "pond_field" }
+    ]
+  },
+  {
+    "id": "water_body",
+    "type": "oter_vision",
+    "levels": [
+      { "name": "water body", "sym": "#", "color": "blue", "looks_like": "river_center" },
+      { "name": "water body", "sym": "#", "color": "blue", "looks_like": "river_center" }
+    ]
+  },
+  {
+    "id": "roof_or_air",
+    "type": "oter_vision",
+    "levels": [
+      { "name": "open air", "color": "blue", "sym": ".", "looks_like": "open_air" },
+      { "name": "open air", "color": "blue", "sym": ".", "looks_like": "open_air" }
+    ]
+  },
+  {
+    "id": "underground_dirt",
+    "type": "oter_vision",
+    "levels": [ { "name": "underground", "color": "brown", "sym": "#" }, { "name": "basement", "color": "black", "sym": "O" } ]
+  },
+  {
+    "id": "underground_stone",
+    "type": "oter_vision",
+    "levels": [ { "name": "underground", "color": "brown", "sym": "#" }, { "name": "basement", "color": "black", "sym": "O" } ]
+  },
+  {
+    "id": "large_building",
+    "type": "oter_vision",
+    "levels": [
+      { "name": "large building", "color": "i_white", "sym": "+" },
+      { "name": "large building", "color": "i_white", "sym": "+" },
+      { "name": "large building", "color": "i_white", "sym": "+" }
+    ]
+  },
+  {
+    "id": "large_city_building",
+    "type": "oter_vision",
+    "levels": [
+      { "name": "city", "color": "light_gray", "sym": "#" },
+      { "name": "large building", "color": "i_light_gray", "sym": "+" },
+      { "name": "large building", "color": "i_light_gray", "sym": "+" }
+    ]
+  },
+  {
+    "id": "large_structure",
+    "//": "more recognizable structure, easier to figure out what is",
+    "type": "oter_vision",
+    "levels": [
+      { "name": "structure", "color": "light_gray", "sym": "#" },
+      { "name": "structure", "color": "light_gray", "sym": "#" }
+    ]
+  },
+  {
+    "id": "large_ship",
+    "type": "oter_vision",
+    "levels": [ { "name": "ship", "color": "dark_gray", "sym": "#" }, { "name": "ship", "color": "dark_gray", "sym": "#" } ]
+  },
+  {
+    "id": "large_outcropping",
+    "type": "oter_vision",
+    "levels": [
+      { "name": "outcropping", "color": "light_gray", "sym": "X" },
+      { "name": "outcropping", "color": "light_gray", "sym": "X" }
+    ]
+  },
+  {
+    "id": "natural_outcropping",
+    "type": "oter_vision",
+    "levels": [
+      { "blends_adjacent": true },
+      { "name": "outcropping", "color": "brown", "sym": "^" },
+      { "name": "outcropping", "color": "brown", "sym": "^" }
+    ]
+  },
+  {
+    "id": "natural_depression",
+    "type": "oter_vision",
+    "levels": [
+      { "blends_adjacent": true },
+      { "name": "depression", "color": "brown", "sym": "U" },
+      { "name": "depression", "color": "brown", "sym": "U" }
+    ]
+  },
+  {
+    "id": "unusual_structure",
+    "//": "can't even mistake it for something familiar",
+    "type": "oter_vision",
+    "levels": [
+      { "name": "unusual structure", "sym": "8", "color": "i_brown" },
+      { "name": "unusual structure", "sym": "8", "color": "i_brown" }
+    ]
+  },
+  {
+    "id": "blends_till_outlines",
+    "type": "oter_vision",
+    "levels": [ { "blends_adjacent": true } ]
+  },
+  {
+    "id": "blends_till_details",
+    "type": "oter_vision",
+    "levels": [ { "blends_adjacent": true }, { "blends_adjacent": true } ]
+  }
+]
diff --git a/doc/OVERMAP.md b/doc/OVERMAP.md
index d8c4162ac3531..2c7a959628a5c 100644
--- a/doc/OVERMAP.md
+++ b/doc/OVERMAP.md
@@ -210,6 +210,21 @@ update these definitions as follows:
 }
 ```
 
+### oter_vision
+
+When the overmap is displayed to the player through the map screen, tiles can be displayed with
+varying degrees of information. There are five levels of overmap vision, each providing progressively
+more detail about the shown tile. They are as follows:
+
+- unseen, no information is known about the tile
+- vague, only cursory details such as from a quick glance - broad features
+- outlines, able to distinguish large/visible features
+- details, features that are harder to spot become visible
+- full, all information provided in the **overmap_terrain** is provided
+
+The information on how to display the middle three vision levels is provided in a **oter_vision**
+defintion.
+
 ## Overmap Terrain
 
 ### Rotation
@@ -231,6 +246,7 @@ rotation for the referenced overmap terrains (e.g. the `_north` version for all)
 | `sym`             | Symbol used when drawing the location, like `"F"` (or you may use an ASCII value like `70`).     |
 | `color`           | Color to draw the symbol in. See [COLOR.md](COLOR.md).                                           |
 | `looks_like`      | Id of another overmap terrain to be used for the graphical tile, if this doesn't have one.       |
+| `vision_levels`   | Id of a `oter_vision` that describes how this overmap terrain will be displayed when there is not full vision of the tile.
 | `connect_group`   | Specify that this overmap terrain might be graphically connected to its neighbours, should a tileset wish to.  It will connect to any other `overmap_terrain` with the same `connect_group`. |
 | `see_cost`        | Affects player vision on overmap. Higher values obstruct vision more.                            |
 | `travel_cost_type` | How to treat this location when planning a route using autotravel on the overmap. Valid values are `road`,`field`,`dirt_road`,`trail`,`forest`,`shore`,`swamp`,`water`,`air`,`impassable`,`other`. Some types are harder to travel through with different types of vehicles, or on foot. |
@@ -281,6 +297,42 @@ an exhaustive example...
 }
 ```
 
+## Overmap Vision
+
+### Fields
+
+| Identifier | Description |
+|------------|-------------|
+| type       | Must be `oter_vision` |
+| id         | Identifier of this `oter_vision`. Cannot contain a `$`. |
+| levels     | Array of vision levels. Between 0 and 3 can be specified. The information is specified in the order of vague, outlines, detailed |
+
+For levels, each entry is a JSON object with the following fields
+
+| Identifier | Description |
+|------------|-------------|
+| name       | Same as an overmap_terrain name |
+| sym        | Same as an overmap_terrain sym |
+| color      | Same as an overmap_terrain color |
+| looks_like | overmap_terrain id that will be drawn if there is no tile drawn |
+| blends_adjacent | If true, the other fields will be ignored and instead of drawing this tile, the most common adjacent tile will be selected and drawn instead |
+
+For tilesets, the id for each level will be specified as: `id$VISION_LEVEL`, where `VISION_LEVEL` is
+replaced by one of `vague`, `outlines`, or `details`.
+
+### Example
+
+```json
+{
+  "type": "oter_vision",
+  "id": "example_vision",
+  "levels": [
+    { "blends_adjacent": true },
+    { "name": "example", "sym": "&", "color": "white" }
+  ]
+}
+```
+
 ## Overmap Special
 
 An overmap special is an entity that is placed in the overmap after the city generation process has
diff --git a/lang/string_extractor/parser.py b/lang/string_extractor/parser.py
index 589e204481c61..db2099f258c3a 100644
--- a/lang/string_extractor/parser.py
+++ b/lang/string_extractor/parser.py
@@ -43,6 +43,7 @@
 from .parsers.npc import parse_npc
 from .parsers.npc_class import parse_npc_class
 from .parsers.option_slider import parse_option_slider
+from .parsers.oter_vision import parse_oter_vision
 from .parsers.overmap_terrain import parse_overmap_terrain
 from .parsers.palette import parse_palette
 from .parsers.profession import parse_profession
@@ -192,6 +193,7 @@ def dummy_parser(json, origin):
     "npc": parse_npc,
     "npc_class": parse_npc_class,
     "oter_id_migration": dummy_parser,
+    "oter_vision": parse_oter_vision,
     "option_slider": parse_option_slider,
     "overlay_order": dummy_parser,
     "overmap_connection": dummy_parser,
diff --git a/lang/string_extractor/parsers/oter_vision.py b/lang/string_extractor/parsers/oter_vision.py
new file mode 100644
index 0000000000000..70d388e4c4f20
--- /dev/null
+++ b/lang/string_extractor/parsers/oter_vision.py
@@ -0,0 +1,9 @@
+from ..write_text import write_text
+
+
+def parse_oter_vision(json, origin):
+    if "levels" in json:
+        for level in json["levels"]:
+            if "name" in json:
+                write_text(json["name"], origin,
+                           comment="oter vision level name")
diff --git a/src/activity_handlers.cpp b/src/activity_handlers.cpp
index 4dc347232a0c3..c153a814b1abc 100644
--- a/src/activity_handlers.cpp
+++ b/src/activity_handlers.cpp
@@ -76,6 +76,7 @@
 #include "npc.h"
 #include "omdata.h"
 #include "output.h"
+#include "overmap.h"
 #include "overmapbuffer.h"
 #include "pimpl.h"
 #include "player_activity.h"
@@ -3790,7 +3791,7 @@ void activity_handlers::tree_communion_do_turn( player_activity *act, Character
     seen.insert( loc );
     const std::function<bool( const oter_id & )> filter = []( const oter_id & ter ) {
         // FIXME: this is terrible and should be a property instead of a name check...
-        return ter.obj().is_wooded() || ter.obj().get_name() == _( "field" );
+        return ter.obj().is_wooded() || ter.obj().get_name( om_vision_level::full ) == _( "field" );
     };
     while( !q.empty() ) {
         tripoint_abs_omt tpt = q.front();
diff --git a/src/cata_tiles.cpp b/src/cata_tiles.cpp
index d862f8da72169..fd42c31842457 100644
--- a/src/cata_tiles.cpp
+++ b/src/cata_tiles.cpp
@@ -52,6 +52,7 @@
 #include "npc.h"
 #include "output.h"
 #include "overlay_ordering.h"
+#include "overmap.h"
 #include "path_info.h"
 #include "pixel_minimap.h"
 #include "rect_range.h"
@@ -100,7 +101,7 @@ static const std::array<std::string, 8> multitile_keys = {{
 };
 
 static const std::string empty_string;
-static const std::array<std::string, 16> TILE_CATEGORY_IDS = {{
+static const std::array<std::string, 17> TILE_CATEGORY_IDS = {{
         "", // TILE_CATEGORY::NONE,
         "vehicle_part", // TILE_CATEGORY::VEHICLE_PART,
         "terrain", // TILE_CATEGORY::TERRAIN,
@@ -114,6 +115,7 @@ static const std::array<std::string, 16> TILE_CATEGORY_IDS = {{
         "hit_entity", // TILE_CATEGORY::HIT_ENTITY,
         "weather", // TILE_CATEGORY::WEATHER,
         "overmap_terrain", // TILE_CATEGORY::OVERMAP_TERRAIN
+        "overmap_vision_level", // TILE_CATEGORY::OVERMAP_VISION_LEVEL
         "overmap_weather", // TILE_CATEGORY::OVERMAP_WEATHER
         "map_extra", // TILE_CATEGORY::MAP_EXTRA
         "overmap_note", // TILE_CATEGORY::OVERMAP_NOTE
@@ -2325,6 +2327,18 @@ cata_tiles::find_tile_looks_like( const std::string &id, TILE_CATEGORY category,
                     looks_like_jumps_limit );
         case TILE_CATEGORY::MONSTER:
             return find_tile_looks_like_by_string_id<mtype>( id, category, looks_like_jumps_limit );
+        case TILE_CATEGORY::OVERMAP_VISION_LEVEL: {
+            size_t id_end = id.find( '$' );
+            om_vision_level level = io::string_to_enum<om_vision_level>( id.substr( id_end + 1 ) );
+            oter_vision_id vision_id( id.substr( 0, id_end ) );
+            // This shouldn't fail, but better safe than sorry
+            const oter_vision::level *viewed = vision_id->viewed( level );
+            if( viewed != nullptr && !viewed->looks_like.empty() ) {
+                return find_tile_looks_like( viewed->looks_like, TILE_CATEGORY::OVERMAP_TERRAIN, variant,
+                                             looks_like_jumps_limit - 1 );
+            }
+            return std::nullopt;
+        }
         case TILE_CATEGORY::OVERMAP_TERRAIN: {
             std::optional<tile_lookup_res> ret;
             const oter_type_str_id type_tmp( id );
@@ -2501,7 +2515,8 @@ bool cata_tiles::draw_from_id_string_internal( const std::string &id, TILE_CATEG
                                                   1.0f ) ) );
         }
 
-        if( prevent_occlusion_transp && retract > 0 ) {
+        // Adding to the id like this breaks the fragile string handling that vision level uses for looks_like.
+        if( prevent_occlusion_transp && retract > 0 && category != TILE_CATEGORY::OVERMAP_VISION_LEVEL ) {
             res = find_tile_looks_like( id + "_transparent", category, variant );
             if( res ) {
                 tt = &res -> tile();
@@ -2614,6 +2629,16 @@ bool cata_tiles::draw_from_id_string_internal( const std::string &id, TILE_CATEG
                 sym = weather_def->symbol;
                 col = weather_def->map_color;
             }
+        } else if( category == TILE_CATEGORY::OVERMAP_VISION_LEVEL ) {
+            size_t id_end = id.find( '$' );
+            om_vision_level level = io::string_to_enum<om_vision_level>( id.substr( id_end + 1 ) );
+            oter_vision_id vision_id( id.substr( 0, id_end ) );
+            // if we have gotten this far, this call can't fail, because the id never would have
+            // been generated to get it. Nonetheless, better safe than sorry
+            if( const oter_vision::level *viewed = vision_id->viewed( level ) ) {
+                sym = viewed->symbol;
+                col = viewed->color;
+            }
         } else if( category == TILE_CATEGORY::OVERMAP_TERRAIN ) {
             const oter_type_str_id tmp( id );
             if( tmp.is_valid() ) {
@@ -2623,9 +2648,9 @@ bool cata_tiles::draw_from_id_string_internal( const std::string &id, TILE_CATEG
                     rota %= om_direction::size;
                     sym = tmp->get_rotated( static_cast<om_direction::type>( rota ) )->get_uint32_symbol();
                 } else {
-                    sym = tmp->symbol;
+                    sym = tmp->get_uint32_symbol();
                 }
-                col = tmp->color;
+                col = tmp->get_color();
             }
         } else if( category == TILE_CATEGORY::OVERMAP_NOTE ) {
             sym = static_cast<uint8_t>( id[5] );
@@ -5380,6 +5405,17 @@ void cata_tiles::do_tile_loading_report()
     oter_types.erase( std::unique( oter_types.begin(), oter_types.end() ), oter_types.end() );
     tile_loading_report_seq_ids( oter_types, TILE_CATEGORY::OVERMAP_TERRAIN );
 
+    std::vector<std::string> oter_vision_levels;
+    for( const oter_vision &level : oter_vision::get_all() ) {
+        oter_vision_levels.push_back( level.get_id().str() + "$" +
+                                      io::enum_to_string( om_vision_level::details ) );
+        oter_vision_levels.push_back( level.get_id().str() + "$" +
+                                      io::enum_to_string( om_vision_level::outlines ) );
+        oter_vision_levels.push_back( level.get_id().str() + "$" +
+                                      io::enum_to_string( om_vision_level::vague ) );
+    }
+    tile_loading_report_seq_ids( oter_vision_levels, TILE_CATEGORY::OVERMAP_VISION_LEVEL );
+
     std::vector<map_extra_id> map_extra_ids = MapExtras::get_all_function_names();
     map_extra_ids.erase(
         std::remove_if( map_extra_ids.begin(), map_extra_ids.end(),
@@ -5390,7 +5426,7 @@ void cata_tiles::do_tile_loading_report()
 
     // TODO: OVERMAP_NOTE
 
-    static_assert( static_cast<int>( TILE_CATEGORY::last ) == 16,
+    static_assert( static_cast<int>( TILE_CATEGORY::last ) == 17,
                    "If you add more tile categories then update this tile loading report and then "
                    "increment the value in this static_assert accordingly" );
 
diff --git a/src/cata_tiles.h b/src/cata_tiles.h
index 82d0533518e8b..01af515574368 100644
--- a/src/cata_tiles.h
+++ b/src/cata_tiles.h
@@ -65,6 +65,7 @@ enum class TILE_CATEGORY {
     HIT_ENTITY,
     WEATHER,
     OVERMAP_TERRAIN,
+    OVERMAP_VISION_LEVEL,
     OVERMAP_WEATHER,
     MAP_EXTRA,
     OVERMAP_NOTE,
@@ -85,6 +86,7 @@ const std::unordered_map<std::string, TILE_CATEGORY> to_TILE_CATEGORY = {
     {"hit_entity", TILE_CATEGORY::HIT_ENTITY},
     {"weather", TILE_CATEGORY::WEATHER},
     {"overmap_terrain", TILE_CATEGORY::OVERMAP_TERRAIN},
+    {"overmap_vision_level", TILE_CATEGORY::OVERMAP_VISION_LEVEL},
     {"overmap_weather", TILE_CATEGORY::OVERMAP_WEATHER},
     {"map_extra", TILE_CATEGORY::MAP_EXTRA},
     {"overmap_note", TILE_CATEGORY::OVERMAP_NOTE}
@@ -716,8 +718,8 @@ class cata_tiles
         static std::vector<options_manager::id_and_option> build_renderer_list();
         static std::vector<options_manager::id_and_option> build_display_list();
     private:
-        std::string get_omt_id_rotation_and_subtile(
-            const tripoint_abs_omt &omp, int &rota, int &subtile );
+        std::pair<std::string, bool> get_omt_id_rotation_and_subtile( const tripoint_abs_omt &omp,
+                int &rota, int &subtile );
     protected:
         template <typename maptype>
         void tile_loading_report_map( const maptype &tiletypemap, TILE_CATEGORY category,
diff --git a/src/character.cpp b/src/character.cpp
index 034ff9683d4e8..55674ac36cc49 100644
--- a/src/character.cpp
+++ b/src/character.cpp
@@ -1292,7 +1292,9 @@ bool Character::overmap_los( const tripoint_abs_omt &omt, int sight_points ) con
 
 int Character::overmap_sight_range( float light_level ) const
 {
+    // How many map tiles I can given the light??
     int sight = sight_range( light_level );
+    // What are these doing???
     if( sight < SEEX ) {
         sight = 0;
     }
@@ -1300,38 +1302,50 @@ int Character::overmap_sight_range( float light_level ) const
         sight /= ( SEEX / 2 );
     }
 
+    // Clamp it for some reason?
     if( sight > 0 ) {
         sight = 6;
     }
 
+    // enchantment modifiers
     sight += enchantment_cache->get_value_add( enchant_vals::mod::OVERMAP_SIGHT );
-
     float multiplier = 1 + enchantment_cache->get_value_multiply( enchant_vals::mod::OVERMAP_SIGHT );
 
     // If sight got changed due OVERMAP_SIGHT, process the rest of the modifiers, otherwise skip them
     if( sight > 0 ) {
         // The higher your perception, the farther you can see.
         sight += static_cast<int>( get_per() / 2 );
-        // The higher up you are, the farther you can see.
-        sight += std::max( 0, posz() ) * 2;
+    }
 
-        // Binoculars double your sight range.
-        // When adding checks here, also call game::update_overmap_seen at the place they first become true
-        const bool has_optic = cache_has_item_with( flag_ZOOM ) ||
-                               has_flag( json_flag_ENHANCED_VISION ) ||
-                               ( is_mounted() && mounted_creature->has_flag( mon_flag_MECH_RECON_VISION ) ) ||
-                               get_map().veh_at( pos_bub() ).avail_part_with_feature( "ENHANCED_VISION" ).has_value();
+    if( sight == 0 ) {
+        return 0;
+    }
 
-        if( has_optic ) {
-            multiplier += 1;
-        }
+    return std::max<int>( std::round( sight * multiplier ), 3 );
+}
+
+int Character::overmap_modified_sight_range( float light_level ) const
+{
+    int sight = overmap_sight_range( light_level );
+
+    // The higher up you are, the farther you can see.
+    sight += std::max( 0, posz() ) * 2;
+
+    // Binoculars double your sight range.
+    // When adding checks here, also call game::update_overmap_seen at the place they first become true
+    const bool has_optic = cache_has_item_with( flag_ZOOM ) ||
+                           has_flag( json_flag_ENHANCED_VISION ) ||
+                           ( is_mounted() && mounted_creature->has_flag( mon_flag_MECH_RECON_VISION ) ) ||
+                           get_map().veh_at( pos_bub() ).avail_part_with_feature( "ENHANCED_VISION" ).has_value();
+
+    if( has_optic ) {
+        sight *= 2;
     }
 
     if( sight == 0 ) {
         return 0;
     }
 
-    sight = std::round( sight * multiplier );
     return std::max( sight, 3 );
 }
 
diff --git a/src/character.h b/src/character.h
index 228749f030845..62d786d07a9ad 100644
--- a/src/character.h
+++ b/src/character.h
@@ -862,6 +862,8 @@ class Character : public Creature, public visitable
         bool overmap_los( const tripoint_abs_omt &omt, int sight_points ) const;
         /** Returns the distance the player can see on the overmap */
         int  overmap_sight_range( float light_level ) const;
+        /** Returns the distance the player can see on the overmap, modified by zoom & height */
+        int overmap_modified_sight_range( float light_level ) const;
         /** Returns the distance the player can see through walls */
         int  clairvoyance() const;
         /** Returns true if the player has some form of impaired sight */
diff --git a/src/computer_session.cpp b/src/computer_session.cpp
index b639e55e26124..2ff32d849707c 100644
--- a/src/computer_session.cpp
+++ b/src/computer_session.cpp
@@ -693,7 +693,7 @@ void computer_session::action_map_sewer()
             const oter_id &oter = overmap_buffer.ter( center + offset );
             if( ( oter->get_type_id() == oter_type_sewer ) ||
                 is_ot_match( "sewage", oter, ot_match_type::prefix ) ) {
-                overmap_buffer.set_seen( center + offset, true );
+                overmap_buffer.set_seen( center + offset, om_vision_level::details );
             }
         }
     }
@@ -712,7 +712,7 @@ void computer_session::action_map_subway()
             const oter_id &oter = overmap_buffer.ter( center + offset );
             if( ( oter->get_type_id() == oter_type_subway ) ||
                 is_ot_match( "lab_train_depot", oter, ot_match_type::contains ) ) {
-                overmap_buffer.set_seen( center + offset, true );
+                overmap_buffer.set_seen( center + offset, om_vision_level::details );
             }
         }
     }
diff --git a/src/debug_menu.cpp b/src/debug_menu.cpp
index 261e30ede5bcc..9dc9de28e01e0 100644
--- a/src/debug_menu.cpp
+++ b/src/debug_menu.cpp
@@ -2169,7 +2169,7 @@ static void character_edit_menu()
         if( np->has_destination() ) {
             data << string_format(
                      _( "Destination: %s %s" ), np->goal.to_string(),
-                     overmap_buffer.ter( np->goal )->get_name() ) << std::endl;
+                     overmap_buffer.ter( np->goal )->get_name( om_vision_level::full ) ) << std::endl;
         }
         data << string_format( _( "Trust: %d" ), np->op_of_u.trust ) << " "
              << string_format( _( "Fear: %d" ), np->op_of_u.fear ) << " "
@@ -2939,7 +2939,7 @@ static void debug_menu_game_state()
     popup_top(
         s.c_str(),
         player_character.posx(), player_character.posy(), abs_sub.x(), abs_sub.y(),
-        overmap_buffer.ter( player_character.global_omt_location() )->get_name(),
+        overmap_buffer.ter( player_character.global_omt_location() )->get_name( om_vision_level::full ),
         to_turns<int>( calendar::turn - calendar::turn_zero ),
         g->num_creatures() );
     for( const npc &guy : g->all_npcs() ) {
@@ -3668,11 +3668,22 @@ void debug()
             break;
 
         case debug_menu_index::REVEAL_MAP: {
+            uilist vis_sel;
+            vis_sel.text = _( "Reveal at which vision level?" );
+            for( int i = static_cast<int>( om_vision_level::unseen );
+                 i < static_cast<int>( om_vision_level::last ); ++i ) {
+                vis_sel.addentry( i, true, std::nullopt, io::enum_to_string( static_cast<om_vision_level>( i ) ) );
+            }
+            vis_sel.query();
+            int vis_ret = vis_sel.ret;
+            if( vis_ret == UILIST_CANCEL ) {
+                break;
+            }
             overmap &cur_om = g->get_cur_om();
             for( int i = 0; i < OMAPX; i++ ) {
                 for( int j = 0; j < OMAPY; j++ ) {
                     for( int k = -OVERMAP_DEPTH; k <= OVERMAP_HEIGHT; k++ ) {
-                        cur_om.set_seen( { i, j, k }, true );
+                        cur_om.set_seen( { i, j, k }, static_cast<om_vision_level>( vis_ret ), true );
                     }
                 }
             }
diff --git a/src/display.cpp b/src/display.cpp
index 51e897627220b..9850ee064dd43 100644
--- a/src/display.cpp
+++ b/src/display.cpp
@@ -1123,7 +1123,8 @@ std::string display::colorized_overmap_text( const avatar &u, const int width, c
     const int top = -( height / 2 );
     const int bottom = height + top - 1;
 
-    oter_display_options opts( center_xyz, u.overmap_sight_range( g->light_level( u.posz() ) ) );
+    oter_display_options opts( center_xyz,
+                               u.overmap_modified_sight_range( g->light_level( u.posz() ) ) );
     opts.showhordes = true;
     if( mission_xyz != overmap::invalid_tripoint ) {
         opts.mission_target = mission_xyz;
@@ -1175,7 +1176,8 @@ std::string display::current_position_text( const tripoint_abs_omt &loc )
     if( const timed_event *e = get_timed_events().get( timed_event_type::OVERRIDE_PLACE ) ) {
         return e->string_id;
     }
-    return overmap_buffer.ter( loc )->get_name();
+    om_vision_level seen = overmap_buffer.seen( loc );
+    return overmap_buffer.ter( loc )->get_name( seen );
 }
 
 // Return (x, y) position of mission target, relative to avatar location, within an overmap of the
diff --git a/src/editmap.cpp b/src/editmap.cpp
index 6e0e05235e671..67f376b621d76 100644
--- a/src/editmap.cpp
+++ b/src/editmap.cpp
@@ -48,6 +48,7 @@
 #include "omdata.h"
 #include "options.h"
 #include "output.h"
+#include "overmap.h"
 #include "overmapbuffer.h"
 #include "scent_map.h"
 #include "shadowcasting.h"
@@ -1974,8 +1975,8 @@ void editmap::mapgen_preview( const real_coords &tc, uilist &gmenu )
             here.rebuild_vehicle_level_caches();
         } else if( gpmenu.ret == 3 ) {
             popup( _( "Changed oter_id from '%s' (%s) to '%s' (%s)" ),
-                   orig_oters->get_name(), orig_oters.id().str(),
-                   omt_ref->get_name(), omt_ref.id().str() );
+                   orig_oters->get_name( om_vision_level::full ), orig_oters.id().str(),
+                   omt_ref->get_name( om_vision_level::full ), omt_ref.id().str() );
         } else if( gpmenu.ret == UILIST_ADDITIONAL ) {
             if( gpmenu.ret_act == "LEFT" ) {
                 gmenu.scrollby( -1 );
@@ -2147,8 +2148,8 @@ void editmap::edit_mapgen()
 
         gmenu.addentry( -1, !id.id().is_null(), 0, "[%3d] %s", static_cast<int>( id ), id.id().str() );
         gmenu.entries[i].extratxt.left = 1;
-        gmenu.entries[i].extratxt.color = id->get_color();
-        gmenu.entries[i].extratxt.txt = id->get_symbol();
+        gmenu.entries[i].extratxt.color = id->get_color( om_vision_level::full );
+        gmenu.entries[i].extratxt.txt = id->get_symbol( om_vision_level::full );
     }
     real_coords tc;
 
diff --git a/src/faction_camp.cpp b/src/faction_camp.cpp
index 99801bccbb5ec..26c17ad81efd9 100644
--- a/src/faction_camp.cpp
+++ b/src/faction_camp.cpp
@@ -4994,7 +4994,7 @@ tripoint_abs_omt om_target_tile( const tripoint_abs_omt &omt_pos, int min_range,
 
     const oter_id &omt_ref = overmap_buffer.ter( omt_tgt );
 
-    if( must_see && !overmap_buffer.seen( omt_tgt ) ) {
+    if( must_see && overmap_buffer.seen( omt_tgt ) == om_vision_level::unseen ) {
         errors = true;
         popup( _( "You must be able to see the target that you select." ) );
     }
diff --git a/src/game.cpp b/src/game.cpp
index 423a8d0941e10..a85aff7333c23 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -7237,10 +7237,11 @@ void game::pre_print_all_tile_info( const tripoint &lp, const catacurses::window
 {
     // get global area info according to look_around caret position
     // TODO: fix point types
-    const oter_id &cur_ter_m = overmap_buffer.ter( tripoint_abs_omt( ms_to_omt_copy( m.getabs(
-                                   lp ) ) ) );
+    tripoint_abs_omt omp( ms_to_omt_copy( m.getabs( lp ) ) );
+    const oter_id &cur_ter_m = overmap_buffer.ter( omp );
+    om_vision_level vision = overmap_buffer.seen( omp );
     // we only need the area name and then pass it to print_all_tile_info() function below
-    const std::string area_name = cur_ter_m->get_name();
+    const std::string area_name = cur_ter_m->get_name( vision );
     print_all_tile_info( lp, w_info, area_name, 1, first_line, last_line, cache );
 }
 
@@ -12358,7 +12359,7 @@ void game::vertical_notes( int z_before, int z_after )
         const tripoint_abs_omt cursp_before( p.xy(), z_before );
         const tripoint_abs_omt cursp_after( p.xy(), z_after );
 
-        if( !overmap_buffer.seen( cursp_before ) ) {
+        if( overmap_buffer.seen( cursp_before ) == om_vision_level::unseen ) {
             continue;
         }
         if( overmap_buffer.has_note( cursp_after ) ) {
@@ -12369,11 +12370,11 @@ void game::vertical_notes( int z_before, int z_after )
         const oter_id &ter2 = overmap_buffer.ter( cursp_after );
         if( z_after > z_before && ter->has_flag( oter_flags::known_up ) &&
             !ter2->has_flag( oter_flags::known_down ) ) {
-            overmap_buffer.set_seen( cursp_after, true );
+            overmap_buffer.set_seen( cursp_after, om_vision_level::full );
             overmap_buffer.add_note( cursp_after, string_format( ">:W;%s", _( "AUTO: goes down" ) ) );
         } else if( z_after < z_before && ter->has_flag( oter_flags::known_down ) &&
                    !ter2->has_flag( oter_flags::known_up ) ) {
-            overmap_buffer.set_seen( cursp_after, true );
+            overmap_buffer.set_seen( cursp_after, om_vision_level::full );
             overmap_buffer.add_note( cursp_after, string_format( "<:W;%s", _( "AUTO: goes up" ) ) );
         }
     }
@@ -12478,10 +12479,11 @@ point game::update_map( int &x, int &y, bool z_level_changed )
 void game::update_overmap_seen()
 {
     const tripoint_abs_omt ompos = u.global_omt_location();
-    const int dist = u.overmap_sight_range( light_level( u.posz() ) );
+    const int dist = u.overmap_modified_sight_range( light_level( u.posz() ) );
+    const int base_sight = u.overmap_sight_range( light_level( u.posz() ) );
     const int dist_squared = dist * dist;
     // We can always see where we're standing
-    overmap_buffer.set_seen( ompos, true );
+    overmap_buffer.set_seen( ompos, om_vision_level::full );
     for( const tripoint_abs_omt &p : points_in_radius( ompos, dist ) ) {
         const point_rel_omt delta = p.xy() - ompos.xy();
         const int h_squared = delta.x() * delta.x() + delta.y() * delta.y();
@@ -12504,12 +12506,22 @@ void game::update_overmap_seen()
             const oter_id &ter = overmap_buffer.ter( *it );
             sight_points -= static_cast<int>( ter->get_see_cost() ) * multiplier;
         }
-        if( sight_points >= 0 ) {
+        const auto set_seen = []( const tripoint_abs_omt & p, om_vision_level level ) {
             tripoint_abs_omt seen( p );
             do {
-                overmap_buffer.set_seen( seen, true );
+                overmap_buffer.set_seen( seen, level );
                 --seen.z();
             } while( seen.z() >= 0 );
+        };
+        int tiles_from = rl_dist( p, ompos );
+        if( tiles_from < std::floor( base_sight / 2 ) ) {
+            set_seen( p, om_vision_level::full );
+        } else if( tiles_from < base_sight ) {
+            set_seen( p, om_vision_level::details );
+        } else if( tiles_from < base_sight * 2 ) {
+            set_seen( p, om_vision_level::outlines );
+        } else {
+            set_seen( p, om_vision_level::vague );
         }
     }
 }
diff --git a/src/iexamine.cpp b/src/iexamine.cpp
index c583cc3cc9c28..0d0eb757096f6 100644
--- a/src/iexamine.cpp
+++ b/src/iexamine.cpp
@@ -67,6 +67,7 @@
 #include "npc.h"
 #include "options.h"
 #include "output.h"
+#include "overmap.h"
 #include "overmapbuffer.h"
 #include "pimpl.h"
 #include "player_activity.h"
@@ -1239,7 +1240,8 @@ int _choose_elevator_destz( tripoint const &examp, tripoint_abs_omt const &this_
             _rotate_point_sm( { examp.xy(), z }, _get_rot_delta( this_omt, that_omt ), sm_orig );
 
         if( here.ter( zp )->has_examine( iexamine::elevator ) ) {
-            std::string const omt_name = overmap_buffer.ter_existing( that_omt )->get_name();
+            std::string const omt_name = overmap_buffer.ter_existing( that_omt )->get_name(
+                                             om_vision_level::full );
             std::string const name = string_format(
                                          "%i %s%s", z, omt_name, z == examp.z ? _( " (this floor)" ) : std::string() );
             choice.addentry( z + uilist_positive, z != examp.z, MENU_AUTOASSIGN, name );
diff --git a/src/init.cpp b/src/init.cpp
index 42f367698e384..5c920c1a4f2f8 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -415,6 +415,7 @@ void DynamicDataLoader::initialize()
     add( "oter_id_migration", &overmap::load_oter_id_migration );
     add( "camp_migration", &overmap::load_oter_id_camp_migration );
     add( "overmap_terrain", &overmap_terrains::load );
+    add( "oter_vision", &oter_vision::load_oter_vision );
     add( "construction_category", &construction_categories::load );
     add( "construction_group", &construction_groups::load );
     add( "construction", &load_construction );
@@ -613,6 +614,7 @@ void DynamicDataLoader::unload_data()
     overmap_connections::reset();
     overmap_land_use_codes::reset();
     overmap_locations::reset();
+    oter_vision::reset();
     city::reset();
     overmap_specials::reset();
     overmap_special_migration::reset();
@@ -843,6 +845,7 @@ void DynamicDataLoader::check_consistency( loading_ui &ui )
             { _( "Overmap land use codes" ), &overmap_land_use_codes::check_consistency },
             { _( "Overmap connections" ), &overmap_connections::check_consistency },
             { _( "Overmap terrain" ), &overmap_terrains::check_consistency },
+            { _( "Overmap terrain vision" ), &oter_vision::check_oter_vision },
             { _( "Overmap locations" ), &overmap_locations::check_consistency },
             { _( "Cities" ), &city::check_consistency },
             { _( "Overmap specials" ), &overmap_specials::check_consistency },
diff --git a/src/iuse.cpp b/src/iuse.cpp
index 42140c9ab3caf..8e928130cdd36 100644
--- a/src/iuse.cpp
+++ b/src/iuse.cpp
@@ -6334,10 +6334,11 @@ static item::extended_photo_def photo_def_for_camera_point( const tripoint &aim_
     }
 
     // TODO: fix point types
-    const oter_id &cur_ter =
-        overmap_buffer.ter( tripoint_abs_omt( ms_to_omt_copy( here.getabs( aim_point ) ) ) );
+    tripoint_abs_omt omp( ms_to_omt_copy( here.getabs( aim_point ) ) );
+    const oter_id &cur_ter = overmap_buffer.ter( omp );
+    om_vision_level vision = overmap_buffer.seen( omp );
     std::string overmap_desc = string_format( _( "In the background you can see a %s." ),
-                               colorize( cur_ter->get_name(), cur_ter->get_color() ) );
+                               colorize( cur_ter->get_name( vision ), cur_ter->get_color( vision ) ) );
     if( outside_tiles_num == total_tiles_num ) {
         photo_text += _( "\n\nThis photo was taken <color_dark_gray>outside</color>." );
     } else if( outside_tiles_num == 0 ) {
diff --git a/src/iuse_actor.cpp b/src/iuse_actor.cpp
index 6ddc0e8d25e44..4cb9f720db0ce 100644
--- a/src/iuse_actor.cpp
+++ b/src/iuse_actor.cpp
@@ -66,6 +66,7 @@
 #include "music.h"
 #include "mutation.h"
 #include "output.h"
+#include "overmap.h"
 #include "overmapbuffer.h"
 #include "pimpl.h"
 #include "player_activity.h"
@@ -1221,7 +1222,7 @@ void reveal_map_actor::reveal_targets( const tripoint_abs_omt &center,
     const auto places = overmap_buffer.find_all( center, target.first, radius, false,
                         target.second );
     for( const tripoint_abs_omt &place : places ) {
-        if( !overmap_buffer.seen( place ) ) {
+        if( overmap_buffer.seen( place ) == om_vision_level::unseen ) {
             // Should be replaced with the character using the item passed as an argument if NPCs ever learn to use maps
             get_avatar().map_revealed_omts.emplace( place );
         }
diff --git a/src/map.cpp b/src/map.cpp
index 642959560d8bb..d74a970ba2ced 100644
--- a/src/map.cpp
+++ b/src/map.cpp
@@ -7230,7 +7230,7 @@ void map::update_visibility_cache( const int zlev )
                 const tripoint sm( gridx, gridy, 0 );
                 const tripoint_abs_sm abs_sm = map::abs_sub + sm;
                 const tripoint_abs_omt abs_omt = project_to<coords::omt>( abs_sm );
-                overmap_buffer.set_seen( abs_omt, true );
+                overmap_buffer.set_seen( abs_omt, om_vision_level::full );
             }
         }
     }
diff --git a/src/mapgen.cpp b/src/mapgen.cpp
index 3da7152aae59e..e3cc92f746572 100644
--- a/src/mapgen.cpp
+++ b/src/mapgen.cpp
@@ -5496,7 +5496,7 @@ void map::draw_map( mapgendata &dat )
         // not one of the hardcoded ones!
         // load from JSON???
         debugmsg( "Error: tried to generate map for omtype %s, \"%s\" (id_mapgen %s)",
-                  terrain_type.id().c_str(), terrain_type->get_name(), function_key.c_str() );
+                  terrain_type.id().c_str(), terrain_type->get_name( om_vision_level::full ), function_key.c_str() );
         fill_background( this, ter_t_floor );
     }
 
diff --git a/src/memorial_logger.cpp b/src/memorial_logger.cpp
index 2bb5d73fecfe9..b2fe2a5698641 100644
--- a/src/memorial_logger.cpp
+++ b/src/memorial_logger.cpp
@@ -42,6 +42,7 @@
 #include "mutation.h"
 #include "omdata.h"
 #include "output.h"
+#include "overmap.h"
 #include "overmapbuffer.h"
 #include "past_games_info.h"
 #include "pimpl.h"
@@ -127,7 +128,7 @@ void memorial_logger::add( const std::string_view male_msg,
 
     const oter_id &cur_ter = overmap_buffer.ter( player_character.global_omt_location() );
     const oter_type_str_id cur_oter_type = cur_ter->get_type_id();
-    const std::string &oter_name = cur_ter->get_name();
+    const std::string &oter_name = cur_ter->get_name( om_vision_level::full );
 
     log.emplace_back( calendar::turn, cur_oter_type, oter_name, msg );
 }
diff --git a/src/mission_util.cpp b/src/mission_util.cpp
index d50189f7199a0..10bf965c182da 100644
--- a/src/mission_util.cpp
+++ b/src/mission_util.cpp
@@ -78,7 +78,7 @@ static void reveal_target( mission *miss, const std::string &omter_id )
     if( destination != overmap::invalid_tripoint ) {
         const oter_id oter = overmap_buffer.ter( destination );
         add_msg( _( "%s has marked the only %s known to them on your map." ), p->get_name(),
-                 oter->get_name() );
+                 oter->get_name( om_vision_level::full ) );
         miss->set_target( destination );
         if( one_in( 3 ) ) {
             reveal_route( miss, destination );
diff --git a/src/npctalk_funcs.cpp b/src/npctalk_funcs.cpp
index ef8527c815e2b..ccb3722f6da67 100644
--- a/src/npctalk_funcs.cpp
+++ b/src/npctalk_funcs.cpp
@@ -363,7 +363,7 @@ void talk_function::goto_location( npc &p )
         if( elem == p.global_omt_location() ) {
             continue;
         }
-        if( !overmap_buffer.seen( elem ) ) {
+        if( overmap_buffer.seen( elem ) == om_vision_level::unseen ) {
             continue;
         }
         std::optional<basecamp *> camp = overmap_buffer.find_camp( elem.xy() );
diff --git a/src/omdata.h b/src/omdata.h
index 50bbc11646c36..f86655f9018c1 100644
--- a/src/omdata.h
+++ b/src/omdata.h
@@ -42,6 +42,8 @@ struct mapgen_arguments;
 struct oter_t;
 struct overmap_location;
 
+enum class om_vision_level : int8_t;
+
 inline const overmap_land_use_code_id land_use_code_forest( "forest" );
 inline const overmap_land_use_code_id land_use_code_wetland( "wetland" );
 inline const overmap_land_use_code_id land_use_code_wetland_forest( "wetland_forest" );
@@ -111,6 +113,12 @@ type from_cube( cube_direction, const std::string &error_msg );
 
 } // namespace om_direction
 
+namespace io
+{
+template<>
+std::string enum_to_string<om_vision_level>( om_vision_level );
+} // namespace io
+
 template<>
 struct enum_traits<om_direction::type> {
     static constexpr om_direction::type last = om_direction::type::last;
@@ -242,15 +250,61 @@ struct enum_traits<oter_travel_cost_type> {
     static constexpr oter_travel_cost_type last = oter_travel_cost_type::last;
 };
 
+class oter_vision
+{
+    public:
+        struct blended_omt {
+            oter_id id;
+            std::string sym;
+            nc_color color;
+            std::string name;
+        };
+
+        struct level {
+            translation name;
+            uint32_t symbol = 0;
+            nc_color color = c_black;
+            std::string looks_like;
+            bool blends_adjacent;
+
+            void deserialize( const JsonObject &jo );
+        };
+        const level *viewed( om_vision_level ) const;
+
+        static void load_oter_vision( const JsonObject &jo, const std::string &src );
+        static void reset();
+        static void check_oter_vision();
+        static const std::vector<oter_vision> &get_all();
+
+        oter_vision_id get_id() const;
+
+        void load( const JsonObject &jo, std::string_view src );
+        void check() const;
+
+        static blended_omt get_blended_omt_info( const tripoint_abs_omt &omp, om_vision_level vision );
+
+    private:
+        friend class generic_factory<oter_vision>;
+        friend struct mod_tracker;
+        oter_vision_id id;
+        std::vector<std::pair<oter_vision_id, mod_id>> src;
+        bool was_loaded = false;
+
+        std::vector<level> levels;
+};
+
 struct oter_type_t {
     public:
         static const oter_type_t null_type;
 
         string_id<oter_type_t> id;
         std::vector<std::pair<string_id<oter_type_t>, mod_id>> src;
+    private:
+        friend struct oter_t;
         translation name;
         uint32_t symbol = 0;
         nc_color color = c_black;
+    public:
         overmap_land_use_code_id land_use_code = overmap_land_use_code_id::NULL_ID();
         std::vector<std::string> looks_like;
         unsigned char see_cost = 0;     // Affects how far the player can see in the overmap
@@ -264,8 +318,18 @@ struct oter_type_t {
         overmap_static_spawns static_spawns;
         bool was_loaded = false;
 
+        oter_vision_id vision_levels;
+
         std::string get_symbol() const;
 
+        uint32_t get_uint32_symbol() const {
+            return symbol;
+        }
+
+        nc_color get_color() const {
+            return color;
+        }
+
         oter_type_t() = default;
 
         oter_id get_first() const;
@@ -328,21 +392,14 @@ struct oter_t {
         std::string get_mapgen_id() const;
         oter_id get_rotated( om_direction::type dir ) const;
 
-        std::string get_name() const {
-            return type->name.translated();
-        }
-
-        std::string get_symbol( const bool from_land_use_code = false ) const {
-            return utf32_to_utf8( from_land_use_code ? symbol_alt : symbol );
-        }
+        bool blends_adjacent( om_vision_level vision ) const;
 
-        uint32_t get_uint32_symbol() const {
-            return symbol;
-        }
+        std::string get_name( om_vision_level ) const;
+        std::string get_symbol( om_vision_level, bool from_land_use_code = false ) const;
+        uint32_t get_uint32_symbol() const;
+        nc_color get_color( om_vision_level, bool from_land_use_code = false ) const;
 
-        nc_color get_color( const bool from_land_use_code = false ) const {
-            return from_land_use_code ? type->land_use_code->color : type->color;
-        }
+        std::string get_tileset_id( om_vision_level vision ) const;
 
         // dir is only meaningful for rotatable, non-linear terrain.  If you
         // need an answer that also works for linear terrain, call
diff --git a/src/overmap.cpp b/src/overmap.cpp
index 9163c906b6417..286383b74350e 100644
--- a/src/overmap.cpp
+++ b/src/overmap.cpp
@@ -130,6 +130,8 @@ static const oter_type_str_id oter_type_slimepit_down( "slimepit_down" );
 static const oter_type_str_id oter_type_solid_earth( "solid_earth" );
 static const oter_type_str_id oter_type_sub_station( "sub_station" );
 
+static const oter_vision_id oter_vision_default( "default" );
+
 static const overmap_location_id overmap_location_land( "land" );
 static const overmap_location_id overmap_location_swamp( "swamp" );
 
@@ -151,6 +153,44 @@ static oter_id ot_null;
 
 const oter_type_t oter_type_t::null_type{};
 
+namespace
+{
+generic_factory<oter_vision> oter_vision_factory( "oter_vision" );
+} // namespace
+
+template<>
+const oter_vision &string_id<oter_vision>::obj() const
+{
+    return oter_vision_factory.obj( *this );
+}
+
+template<>
+bool string_id<oter_vision>::is_valid() const
+{
+    return oter_vision_factory.is_valid( *this );
+}
+
+void oter_vision::load_oter_vision( const JsonObject &jo, const std::string &src )
+{
+    oter_vision_factory.load( jo, src );
+}
+
+void oter_vision::reset()
+{
+    oter_vision_factory.reset();
+}
+
+void oter_vision::check_oter_vision()
+{
+    oter_vision_factory.check();
+}
+
+const std::vector<oter_vision> &oter_vision::get_all()
+{
+    return oter_vision_factory.get_all();
+}
+
+
 namespace io
 {
 
@@ -761,6 +801,61 @@ std::string enum_to_string<oter_travel_cost_type>( oter_travel_cost_type data )
 }
 } // namespace io
 
+void oter_vision::level::deserialize( const JsonObject &jo )
+{
+    optional( jo, false, "blends_adjacent", blends_adjacent, false );
+    if( blends_adjacent ) {
+        return;
+    }
+    mandatory( jo, false, "name", name );
+    mandatory( jo, false, "sym", symbol, unicode_codepoint_from_symbol_reader );
+    assign( jo, "color", color );
+    optional( jo, false, "looks_like", looks_like );
+}
+
+oter_vision_id oter_vision::get_id() const
+{
+    return id;
+}
+
+void oter_vision::load( const JsonObject &jo, std::string_view )
+{
+    if( id.str().find( '$' ) != std::string::npos ) {
+        jo.throw_error( string_format( "id for vision level %s contains a '$'", id.str() ) );
+    }
+    mandatory( jo, was_loaded, "levels", levels );
+}
+
+const oter_vision::level *oter_vision::viewed( om_vision_level vision ) const
+{
+    size_t idx = -1;
+    switch( vision ) {
+        case om_vision_level::vague:
+            idx = 0;
+            break;
+        case om_vision_level::outlines:
+            idx = 1;
+            break;
+        case om_vision_level::details:
+            idx = 2;
+            break;
+        default:
+            return nullptr;
+    }
+    if( idx >= levels.size() ) {
+        return nullptr;
+    }
+    return &levels[idx];
+}
+
+void oter_vision::check() const
+{
+    if( levels.size() > 3 ) {
+        debugmsg( "Too many vision levels assigned!" );
+    }
+}
+
+
 void oter_type_t::load( const JsonObject &jo, const std::string &src )
 {
     const bool strict = src == "dda";
@@ -796,6 +891,8 @@ void oter_type_t::load( const JsonObject &jo, const std::string &src )
     optional( jo, was_loaded, "connect_group", connect_group, string_reader{} );
     optional( jo, was_loaded, "travel_cost_type", travel_cost_type, oter_travel_cost_type::other );
 
+    optional( jo, was_loaded, "vision_levels", vision_levels, oter_vision_default );
+
     if( has_flag( oter_flags::line_drawing ) ) {
         if( has_flag( oter_flags::no_rotate ) ) {
             jo.throw_error( R"(Mutually exclusive flags: "NO_ROTATE" and "LINEAR".)" );
@@ -827,7 +924,14 @@ void oter_type_t::load( const JsonObject &jo, const std::string &src )
 
 void oter_type_t::check() const
 {
-
+    if( !vision_levels.is_valid() ) {
+        debugmsg( "Invalid vision_levels '%s' for '%s'", vision_levels.str(), id.str() );
+    }
+    /* find omts without vision_levels assigned
+    if( vision_levels == oter_vision_default && !has_flag( oter_flags::should_not_spawn ) ) {
+        fprintf( stderr, "%s (%s)\n", id.c_str(), name.translated().c_str() );
+    }
+    */
 }
 
 void oter_type_t::finalize()
@@ -932,6 +1036,57 @@ oter_id oter_t::get_rotated( om_direction::type dir ) const
            : type->get_rotated( om_direction::add( this->dir, dir ) );
 }
 
+bool oter_t::blends_adjacent( om_vision_level vision ) const
+{
+    if( const oter_vision::level *seen = type->vision_levels->viewed( vision ) ) {
+        return seen->blends_adjacent;
+    }
+    return false;
+}
+
+std::string oter_t::get_name( om_vision_level vision ) const
+{
+    if( const oter_vision::level *seen = type->vision_levels->viewed( vision ) ) {
+        return seen->name.translated();
+    }
+    return type->name.translated();
+}
+
+std::string oter_t::get_symbol( om_vision_level vision, const bool from_land_use_code ) const
+{
+    if( from_land_use_code ) {
+        return utf32_to_utf8( symbol_alt );
+    }
+    if( const oter_vision::level *seen = type->vision_levels->viewed( vision ) ) {
+        return utf32_to_utf8( seen->symbol );
+    }
+    return utf32_to_utf8( symbol );
+}
+
+uint32_t oter_t::get_uint32_symbol() const
+{
+    return symbol;
+}
+
+nc_color oter_t::get_color( om_vision_level vision, const bool from_land_use_code ) const
+{
+    if( from_land_use_code ) {
+        return type->land_use_code->color;
+    }
+    if( const oter_vision::level *seen = type->vision_levels->viewed( vision ) ) {
+        return seen->color;
+    }
+    return type->color;
+}
+
+std::string oter_t::get_tileset_id( om_vision_level vision ) const
+{
+    if( type->vision_levels->viewed( vision ) != nullptr ) {
+        return string_format( "vl#%s$%s", type->vision_levels.str(), io::enum_to_string( vision ) );
+    }
+    return "om#" + type->id.str();
+}
+
 void oter_t::get_rotation_and_subtile( int &rotation, int &subtile ) const
 {
     if( is_linear() ) {
@@ -2963,7 +3118,7 @@ void overmap::init_layers()
         const oter_id tid = get_default_terrain( k - OVERMAP_DEPTH );
         map_layer &l = layer[k];
         l.terrain.fill( tid );
-        l.visible.fill( false );
+        l.visible.fill( om_vision_level::unseen );
         l.explored.fill( false );
     }
 }
@@ -3051,27 +3206,27 @@ std::vector<oter_id> overmap::predecessors( const tripoint_om_omt &p )
     return it->second;
 }
 
-void overmap::set_seen( const tripoint_om_omt &p, bool val )
+void overmap::set_seen( const tripoint_om_omt &p, om_vision_level val, bool force )
 {
     if( !inbounds( p ) ) {
         return;
     }
 
-    if( seen( p ) == val ) {
+    if( !force && seen( p ) >= val ) {
         return;
     }
 
     layer[p.z() + OVERMAP_DEPTH].visible[p.xy()] = val;
 
-    if( val ) {
+    if( val > om_vision_level::details ) {
         add_extra_note( p );
     }
 }
 
-bool overmap::seen( const tripoint_om_omt &p ) const
+om_vision_level overmap::seen( const tripoint_om_omt &p ) const
 {
     if( !inbounds( p ) ) {
-        return false;
+        return om_vision_level::unseen;
     }
     return layer[p.z() + OVERMAP_DEPTH].visible[p.xy()];
 }
@@ -3334,7 +3489,7 @@ void overmap::add_extra( const tripoint_om_omt &p, const map_extra_id &id )
 
 void overmap::add_extra_note( const tripoint_om_omt &p )
 {
-    if( !seen( p ) ) {
+    if( seen( p ) < om_vision_level::details ) {
         return;
     }
 
@@ -3917,8 +4072,9 @@ std::vector<point_abs_omt> overmap::find_terrain( const std::string_view term, i
     for( int x = 0; x < OMAPX; x++ ) {
         for( int y = 0; y < OMAPY; y++ ) {
             tripoint_om_omt p( x, y, zlevel );
-            if( seen( p ) &&
-                lcmatch( ter( p )->get_name(), term ) ) {
+            om_vision_level vision = seen( p );
+            if( vision != om_vision_level::unseen &&
+                lcmatch( ter( p )->get_name( vision ), term ) ) {
                 found.push_back( project_combine( pos(), p.xy() ) );
             }
         }
@@ -7516,6 +7672,24 @@ std::string enum_to_string<ot_match_type>( ot_match_type data )
     }
     cata_fatal( "Invalid ot_match_type" );
 }
+
+template<>
+std::string enum_to_string<om_vision_level>( om_vision_level data )
+{
+    switch( data ) {
+        // *INDENT-OFF*
+        case om_vision_level::unseen: return "unseen";
+        case om_vision_level::vague: return "vague";
+        case om_vision_level::outlines: return "outlines";
+        case om_vision_level::details: return "details";
+        case om_vision_level::full: return "full";
+        // *INDENT-ON*
+        default:
+            break;
+    }
+    debugmsg( "Unknown om_vision_level %d", static_cast<int>( data ) );
+    return "unseen";
+}
 } // namespace io
 
 static const std::array<std::string, 4> suffixes = {{ "_north", "_west", "_south", "_east" }};
diff --git a/src/overmap.h b/src/overmap.h
index f634b372b93ce..3fc9a42c519b1 100644
--- a/src/overmap.h
+++ b/src/overmap.h
@@ -88,9 +88,30 @@ struct radio_tower {
     }
 };
 
+enum class om_vision_level : int8_t {
+    unseen = 0,
+    // Vague details from a quick glance
+    // Broad geographical features - forest,field,buildings,water
+    vague,
+    // A scan from a distance
+    // Track roads, distinguish obvious features (farms from fields)
+    outlines,
+    // Detailed scan from a distance
+    // General building types, some hard to spot features become clear
+    details,
+    // Full knowledge of the tile
+    full,
+    last
+};
+
+template<>
+struct enum_traits<om_vision_level> {
+    static constexpr om_vision_level last = om_vision_level::last;
+};
+
 struct map_layer {
     cata::mdarray<oter_id, point_om_omt> terrain;
-    cata::mdarray<bool, point_om_omt> visible;
+    cata::mdarray<om_vision_level, point_om_omt> visible;
     cata::mdarray<bool, point_om_omt> explored;
     std::vector<om_note> notes;
     std::vector<om_map_extra> extras;
@@ -234,8 +255,9 @@ class overmap
         std::optional<mapgen_arguments> *mapgen_args( const tripoint_om_omt & );
         std::string *join_used_at( const om_pos_dir & );
         std::vector<oter_id> predecessors( const tripoint_om_omt & );
-        void set_seen( const tripoint_om_omt &p, bool val );
-        bool seen( const tripoint_om_omt &p ) const;
+        void set_seen( const tripoint_om_omt &p, om_vision_level val, bool force = false );
+        om_vision_level seen( const tripoint_om_omt &p ) const;
+        bool seen_more_than( const tripoint_om_omt &p, om_vision_level test ) const;
         bool &explored( const tripoint_om_omt &p );
         bool is_explored( const tripoint_om_omt &p ) const;
 
@@ -575,7 +597,7 @@ struct oter_display_lru {
     std::array<std::pair<oter_id, oter_t const *>, cache_size> cache;
     size_t cache_next = 0;
 
-    std::pair<std::string, nc_color> get_symbol_and_color( const oter_id &cur_ter );
+    std::pair<std::string, nc_color> get_symbol_and_color( const oter_id &cur_ter, om_vision_level );
 };
 
 // "arguments" to oter_symbol_and_color that do not change between calls in a batch
@@ -632,10 +654,10 @@ struct oter_display_options {
 // arguments for oter_symbol_and_color pertaining to a single point
 struct oter_display_args {
 
-    explicit oter_display_args( bool seen ) : see( seen ) {}
+    explicit oter_display_args( om_vision_level vis ) : vision( vis ) {}
 
     // Can the/has the PC seen this tile
-    bool see;
+    om_vision_level vision;
     // If this tile is on the edge of the drawn tiles, we may draw a mission indicator on it
     bool edge_tile = false;
     // Check if location is within player line-of-sight
diff --git a/src/overmap_ui.cpp b/src/overmap_ui.cpp
index 62d5b1cb30838..ecf27dff5a55e 100644
--- a/src/overmap_ui.cpp
+++ b/src/overmap_ui.cpp
@@ -41,6 +41,7 @@
 #include "game_ui.h"
 #include "input_context.h"
 #include "line.h"
+#include "localized_comparator.h"
 #include "map.h"
 #include "map_iterator.h"
 #include "mapbuffer.h"
@@ -155,15 +156,16 @@ static std::array<std::pair<nc_color, std::string>, npm_width *npm_height> get_o
          tripoint_range<tripoint_abs_omt>( current - shift, current + shift ) ) {
         nc_color ter_color = c_black;
         std::string ter_sym = " ";
-        const bool see = has_debug_vision || overmap_buffer.seen( dest );
-        if( see ) {
+        om_vision_level vision = has_debug_vision ? om_vision_level::full :
+                                 overmap_buffer.seen( dest );
+        if( vision != om_vision_level::unseen ) {
             // Only load terrain if we can actually see it
             oter_id cur_ter = overmap_buffer.ter( dest );
-            ter_color = cur_ter->get_color();
-            ter_sym = cur_ter->get_symbol();
+            ter_color = cur_ter->get_color( vision );
+            ter_sym = cur_ter->get_symbol( vision );
         } else {
-            ter_color = oter_unexplored.obj().get_color();
-            ter_sym = oter_unexplored.obj().get_symbol();
+            ter_color = oter_unexplored.obj().get_color( om_vision_level::full );
+            ter_sym = oter_unexplored.obj().get_symbol( om_vision_level::full );
         }
         map_around[index++] = std::make_pair( ter_color, ter_sym );
     }
@@ -294,7 +296,8 @@ static void draw_city_labels( const catacurses::window &w, const tripoint_abs_om
             continue;   // right under the cursor.
         }
 
-        if( !overmap_buffer.seen( tripoint_abs_omt( city_pos, center.z() ) ) ) {
+        if( !overmap_buffer.seen_more_than( tripoint_abs_omt( city_pos, center.z() ),
+                                            om_vision_level::outlines ) ) {
             continue;   // haven't seen it.
         }
 
@@ -333,7 +336,8 @@ static void draw_camp_labels( const catacurses::window &w, const tripoint_abs_om
             continue;   // right under the cursor.
         }
 
-        if( !overmap_buffer.seen( tripoint_abs_omt( camp_pos, center.z() ) ) ) {
+        if( !overmap_buffer.seen_more_than( tripoint_abs_omt( camp_pos, center.z() ),
+                                            om_vision_level::outlines ) ) {
             continue;   // haven't seen it.
         }
 
@@ -556,7 +560,7 @@ static void draw_ascii(
     const bool has_debug_vision = player_character.has_trait( trait_DEBUG_NIGHTVISION );
     // sight_points is hoisted for speed reasons.
     const int sight_points = !has_debug_vision ?
-                             player_character.overmap_sight_range( g->light_level( player_character.posz() ) ) :
+                             player_character.overmap_modified_sight_range( g->light_level( player_character.posz() ) ) :
                              100;
 
     oter_display_lru lru_cache;
@@ -614,8 +618,8 @@ static void draw_ascii(
             const point_rel_omt rp( om_direction::rotate( s_ter.p.xy(), uistate.omedit_rotation ) );
             const oter_id oter = s_ter.terrain->get_rotated( uistate.omedit_rotation );
 
-            special_cache.insert( std::make_pair(
-                                      rp, std::make_pair( oter->get_symbol(), oter->get_color() ) ) );
+            special_cache.insert( std::make_pair( rp, std::make_pair( oter->get_symbol( om_vision_level::full ),
+                                                  oter->get_color( om_vision_level::full ) ) ) );
 
             s_begin.x() = std::min( s_begin.x(), rp.x() );
             s_begin.y() = std::min( s_begin.y(), rp.y() );
@@ -638,7 +642,7 @@ static void draw_ascii(
             }
 
             const tripoint_abs_omt pos = np->global_omt_location();
-            if( has_debug_vision || overmap_buffer.seen( pos ) ) {
+            if( has_debug_vision || overmap_buffer.seen_more_than( pos, om_vision_level::details ) ) {
                 auto iter = npc_color.find( pos );
                 nc_color np_color = np->basic_symbol_color();
                 if( iter == npc_color.end() ) {
@@ -710,13 +714,14 @@ static void draw_ascii(
             nc_color ter_color = c_black;
             std::string ter_sym = " ";
 
-            const bool see = has_debug_vision || overmap_buffer.seen( omp );
-            if( see ) {
+            const om_vision_level vision = has_debug_vision ? om_vision_level::full :
+                                           overmap_buffer.seen( omp );
+            if( vision == om_vision_level::unseen ) {
                 // Only load terrain if we can actually see it
                 cur_ter = overmap_buffer.ter( omp );
             }
 
-            oter_display_args oter_args( see );
+            oter_display_args oter_args( vision );
             std::tie( ter_sym, ter_color ) = oter_symbol_and_color( omp, oter_args, oter_opts, &lru_cache );
 
             // Are we debugging monster groups?
@@ -764,8 +769,8 @@ static void draw_ascii(
             // Preview for place_terrain or place_special
             if( uistate.place_terrain || uistate.place_special ) {
                 if( blink && uistate.place_terrain && omp.xy() == center.xy() ) {
-                    ter_color = uistate.place_terrain->get_color();
-                    ter_sym = uistate.place_terrain->get_symbol();
+                    ter_color = uistate.place_terrain->get_color( om_vision_level::full );
+                    ter_sym = uistate.place_terrain->get_symbol( om_vision_level::full );
                 } else if( blink && uistate.place_special ) {
                     const point_rel_omt from_center = omp.xy() - center.xy();
                     if( from_center.x() >= s_begin.x() && from_center.x() <= s_end.x() &&
@@ -853,7 +858,7 @@ static void draw_ascii(
         }
     }
 
-    if( has_debug_vision || overmap_buffer.seen( center ) ) {
+    if( has_debug_vision || overmap_buffer.seen_more_than( center, om_vision_level::details ) ) {
         for( const auto &npc : npcs_near_player ) {
             if( !npc->marked_for_death && npc->global_omt_location() == center ) {
                 corner_text.emplace_back( npc->basic_symbol_color(), npc->get_name() );
@@ -929,9 +934,10 @@ static void draw_om_sidebar(
     const bool has_debug_vision = player_character.has_trait( trait_DEBUG_NIGHTVISION );
     // sight_points is hoisted for speed reasons.
     const int sight_points = !has_debug_vision ?
-                             player_character.overmap_sight_range( g->light_level( player_character.posz() ) ) :
+                             player_character.overmap_modified_sight_range( g->light_level( player_character.posz() ) ) :
                              100;
-    const bool center_seen = has_debug_vision || overmap_buffer.seen( center );
+    om_vision_level center_vision = has_debug_vision ? om_vision_level::full :
+                                    overmap_buffer.seen( center );
     const tripoint_abs_omt target = player_character.get_active_mission_target();
     const bool has_target = target != overmap::invalid_tripoint;
     const bool viewing_weather = uistate.overmap_debug_weather || uistate.overmap_visible_weather;
@@ -961,7 +967,7 @@ static void draw_om_sidebar(
 
     // Draw text describing the overmap tile at the cursor position.
     int lines = 1;
-    if( center_seen ) {
+    if( center_vision != om_vision_level::unseen ) {
         if( !mgroups.empty() ) {
             const point desc_pos( 3, 6 );
             ui.set_cursor( wbar, desc_pos );
@@ -985,25 +991,51 @@ static void draw_om_sidebar(
             const oter_t &ter = overmap_buffer.ter( center ).obj();
             const auto sm_pos = project_to<coords::sm>( center );
 
-            // NOLINTNEXTLINE(cata-use-named-point-constants)
-            mvwputch( wbar, point( 1, 1 ), ter.get_color(), ter.get_symbol() );
+            if( ter.blends_adjacent( center_vision ) ) {
+                oter_vision::blended_omt info = oter_vision::get_blended_omt_info( center, center_vision );
+                // NOLINTNEXTLINE(cata-use-named-point-constants)
+                mvwputch( wbar, point( 1, 1 ), info.color, info.sym );
+            } else {
+                // NOLINTNEXTLINE(cata-use-named-point-constants)
+                mvwputch( wbar, point( 1, 1 ), ter.get_color( center_vision ), ter.get_symbol( center_vision ) );
+            }
 
             const point desc_pos( 3, 1 );
             ui.set_cursor( wbar, desc_pos );
             lines = fold_and_print( wbar, desc_pos, getmaxx( wbar ) - desc_pos.x,
                                     c_light_gray,
                                     overmap_buffer.get_description_at( sm_pos ) );
+            if( center_vision != om_vision_level::full ) {
+                std::string vision_level_string;
+                switch( center_vision ) {
+                    case om_vision_level::vague:
+                        vision_level_string = _( "You can only make out vague details of what's here." );
+                        break;
+                    case om_vision_level::outlines:
+                        vision_level_string = _( "You can only make out outlines of what's here." );
+                        break;
+                    case om_vision_level::details:
+                        vision_level_string = _( "You can make out some details of what's here." );
+                        break;
+                    default:
+                        vision_level_string = _( "This is a bug!" );
+                        break;
+                }
+                lines = fold_and_print( wbar, point( 3, lines + 1 ), getmaxx( wbar ) - 3, c_light_gray,
+                                        vision_level_string );
+            }
         }
     } else {
         const oter_t &ter = oter_unexplored.obj();
 
         // NOLINTNEXTLINE(cata-use-named-point-constants)
-        mvwputch( wbar, point( 1, 1 ), ter.get_color(), ter.get_symbol() );
+        mvwputch( wbar, point( 1, 1 ), ter.get_color( om_vision_level::full ),
+                  ter.get_symbol( om_vision_level::full ) );
 
         const point desc_pos( 3, 1 );
         ui.set_cursor( wbar, desc_pos );
         lines = fold_and_print( wbar, desc_pos, getmaxx( wbar ) - desc_pos.x,
-                                ter.get_color(), ter.get_name() );
+                                ter.get_color( om_vision_level::full ), ter.get_name( om_vision_level::full ) );
     }
 
     // Describe the weather conditions on the following line, if weather is visible
@@ -1020,7 +1052,7 @@ static void draw_om_sidebar(
         }
     }
 
-    if( ( data.debug_editor && center_seen ) || data.debug_info ) {
+    if( ( data.debug_editor && center_vision != om_vision_level::unseen ) || data.debug_info ) {
         mvwprintz( wbar, point( 1, ++lines ), c_white,
                    "abs_omt: %s", center.to_string() );
         const oter_t &oter = overmap_buffer.ter( center ).obj();
@@ -1290,8 +1322,9 @@ static bool search( const ui_adaptor &om_ui, tripoint_abs_omt &curs, const tripo
                 locations.insert( locations.end(), notes.begin(), notes.end() );
             }
 
-            if( om_loc.om->seen( om_relative ) &&
-                match_include_exclude( om_loc.om->ter( om_relative )->get_name(), term ) ) {
+            om_vision_level vision = om_loc.om->seen( om_relative );
+            if( vision != om_vision_level::unseen &&
+                match_include_exclude( om_loc.om->ter( om_relative )->get_name( vision ), term ) ) {
                 locations.push_back( project_combine( om_loc.om->pos(), om_relative.xy() ) );
             }
         }
@@ -1408,14 +1441,20 @@ static void place_ter_or_special( const ui_adaptor &om_ui, tripoint_abs_omt &cur
     if( terrain ) {
         pmenu.title = _( "Select terrain to place:" );
         for( const oter_t &oter : overmap_terrains::get_all() ) {
-            const std::string entry_text = string_format(
-                                               _( "sym: [ %s %s ], color: [ %s %s], name: [ %s ], id: [ %s ]" ),
-                                               colorize( oter.get_symbol(), oter.get_color() ),
-                                               colorize( oter.get_symbol( true ), oter.get_color( true ) ),
-                                               colorize( string_from_color( oter.get_color() ), oter.get_color() ),
-                                               colorize( string_from_color( oter.get_color( true ) ), oter.get_color( true ) ),
-                                               colorize( oter.get_name(), oter.get_color() ),
-                                               colorize( oter.id.str(), c_white ) );
+            const std::string entry_text =
+                string_format(
+                    _( "sym: [ %s %s ], color: [ %s %s], name: [ %s ], id: [ %s ]" ),
+                    colorize( oter.get_symbol( om_vision_level::full ),
+                              oter.get_color( om_vision_level::full ) ),
+                    colorize( oter.get_symbol( om_vision_level::full, true ),
+                              oter.get_color( om_vision_level::full, true ) ),
+                    colorize( string_from_color( oter.get_color( om_vision_level::full ) ),
+                              oter.get_color( om_vision_level::full ) ),
+                    colorize( string_from_color( oter.get_color( om_vision_level::full, true ) ),
+                              oter.get_color( om_vision_level::full, true ) ),
+                    colorize( oter.get_name( om_vision_level::full ),
+                              oter.get_color( om_vision_level::full ) ),
+                    colorize( oter.id.str(), c_white ) );
             pmenu.addentry( oter.id.id().to_i(), true, 0, entry_text );
         }
     } else {
@@ -1513,13 +1552,13 @@ static void place_ter_or_special( const ui_adaptor &om_ui, tripoint_abs_omt &cur
             } else if( action == "CONFIRM" ) { // Actually modify the overmap
                 if( terrain ) {
                     overmap_buffer.ter_set( curs, uistate.place_terrain->id.id() );
-                    overmap_buffer.set_seen( curs, true );
+                    overmap_buffer.set_seen( curs, om_vision_level::full );
                 } else {
                     if( std::optional<std::vector<tripoint_abs_omt>> used_points =
                             overmap_buffer.place_special( *uistate.place_special, curs,
                                                           uistate.omedit_rotation, false, true ) ) {
                         for( const tripoint_abs_omt &pos : *used_points ) {
-                            overmap_buffer.set_seen( pos, true );
+                            overmap_buffer.set_seen( pos, om_vision_level::full );
                         }
                     }
                 }
@@ -1583,7 +1622,7 @@ static void set_special_args( tripoint_abs_omt &curs )
 static std::vector<tripoint_abs_omt> get_overmap_path_to( const tripoint_abs_omt &dest,
         bool driving )
 {
-    if( !overmap_buffer.seen( dest ) ) {
+    if( overmap_buffer.seen( dest ) == om_vision_level::unseen ) {
         return {};
     }
     const Character &player_character = get_player_character();
@@ -1966,7 +2005,91 @@ static tripoint_abs_omt display( const tripoint_abs_omt &orig,
 
 } // namespace overmap_ui
 
-std::pair<std::string, nc_color> oter_display_lru::get_symbol_and_color( const oter_id &cur_ter )
+struct blended_omt {
+    oter_id id;
+    std::string sym;
+    nc_color color;
+    std::string name;
+};
+
+oter_vision::blended_omt oter_vision::get_blended_omt_info( const tripoint_abs_omt &omp,
+        om_vision_level vision )
+{
+    std::vector<std::pair<oter_id, om_vision_level>> neighbors;
+    const auto add_to_neighbors = [&vision, &neighbors, &omp]( const tripoint_abs_omt & next ) {
+        if( next == omp ) {
+            return;
+        }
+        om_vision_level local_vision = overmap_buffer.seen( next );
+        if( local_vision == om_vision_level::unseen ) {
+            return;
+        }
+        oter_id ter = overmap_buffer.ter( next );
+        // If the target tile is next to a tile that blends adjacent at the vision level the target tile is at,
+        // but not at the vision level it is at, the SDL overmap will be fed the id for the vision level of the
+        // tile at the vision level of the target tile, resulting in it drawing the placeholder symbol and color
+        // for the adjacent-blending tile.
+        if( ter->blends_adjacent( vision ) ) {
+            return;
+        }
+        neighbors.emplace_back( ter, vision );
+    };
+    for( const tripoint_abs_omt &next : tripoint_range<tripoint_abs_omt>( omp + point_north_west,
+            omp + point_south_east ) ) {
+        add_to_neighbors( next );
+    }
+    // if nothing's immediately adjacent, reach out further
+    if( neighbors.empty() ) {
+        for( const tripoint_abs_omt &next : tripoint_range<tripoint_abs_omt>( omp + point( -2, -2 ),
+                omp + point( 2, 2 ) ) ) {
+            add_to_neighbors( next );
+        }
+    }
+    // Okay, it didn't work, we can't see this tile
+    if( neighbors.empty() ) {
+        oter_vision::blended_omt ret;
+        ret.id = oter_unexplored;
+        ret.sym = oter_unexplored->get_symbol( om_vision_level::full );
+        ret.color = oter_unexplored->get_color( om_vision_level::full );
+        ret.name = oter_unexplored->get_name( om_vision_level::full );
+        return ret;
+    }
+    std::vector<std::pair<size_t, int>> counts;
+    for( size_t i = 0; i < neighbors.size(); ++i ) {
+        const auto refers_to_same = [i, &neighbors]( const std::pair<size_t, int> &entry ) {
+            return neighbors[entry.first] == neighbors[i];
+        };
+        auto it = std::find_if( counts.begin(), counts.end(), refers_to_same );
+        if( it == counts.end() ) {
+            counts.emplace_back( i, 1 );
+            continue;
+        }
+        it->second += 1;
+    }
+    const auto sort_counts = [&neighbors]( const std::pair<size_t, int> &l,
+    const std::pair<size_t, int> &r ) {
+        // Put in descending order
+        if( l.second != r.second ) {
+            return l.second > r.second;
+        }
+        // And do something stable so it doesn't shift if they're all equal
+        const std::pair<oter_id, om_vision_level> left = neighbors[l.first];
+        const std::pair<oter_id, om_vision_level> right = neighbors[r.first];
+        return localized_compare( left.first->get_name( left.second ),
+                                  right.first->get_name( right.second ) );
+    };
+    std::sort( counts.begin(), counts.end(), sort_counts );
+    oter_vision::blended_omt ret;
+    size_t idx = counts[0].first;
+    ret.id = neighbors[idx].first;
+    ret.sym = ret.id->get_symbol( neighbors[idx].second );
+    ret.color = ret.id->get_color( neighbors[idx].second );
+    ret.name = ret.id->get_name( neighbors[idx].second );
+    return ret;
+}
+
+std::pair<std::string, nc_color> oter_display_lru::get_symbol_and_color( const oter_id &cur_ter,
+        om_vision_level vision )
 {
     std::pair<std::string, nc_color> ret = {"?", c_red};
     // First see if we have the oter_t cached
@@ -1985,8 +2108,8 @@ std::pair<std::string, nc_color> oter_display_lru::get_symbol_and_color( const o
     }
     // Ok, we found something
     if( info ) {
-        ret.second = info->get_color( uistate.overmap_show_land_use_codes );
-        ret.first = info->get_symbol( uistate.overmap_show_land_use_codes );
+        ret.second = info->get_color( vision, uistate.overmap_show_land_use_codes );
+        ret.first = info->get_symbol( vision, uistate.overmap_show_land_use_codes );
     }
     return ret;
 }
@@ -2004,7 +2127,8 @@ std::pair<std::string, nc_color> oter_symbol_and_color( const tripoint_abs_omt &
         plist = line_to( opts.center.xy(), opts.mission_target->xy() );
     }
 
-    if( args.see ) {
+    // Only load terrain if we can see it
+    if( args.vision != om_vision_level::unseen ) {
         cur_ter = overmap_buffer.ter( omp );
     }
 
@@ -2041,10 +2165,10 @@ std::pair<std::string, nc_color> oter_symbol_and_color( const tripoint_abs_omt &
         // Display notes in all situations, even when not seen
         std::tie( ret.first, ret.second,
                   std::ignore ) = overmap_ui::get_note_display_info( overmap_buffer.note( omp ) );
-    } else if( !args.see ) {
+    } else if( args.vision == om_vision_level::unseen ) {
         // All cases above ignore the seen-status,
-        ret.second = oter_unexplored.obj().get_color();
-        ret.first = oter_unexplored.obj().get_symbol();
+        ret.second = oter_unexplored.obj().get_color( om_vision_level::full );
+        ret.first = oter_unexplored.obj().get_symbol( om_vision_level::full );
         // All cases below assume that see is true.
     } else if( opts.blink && opts.npc_color.count( omp ) != 0 ) {
         // Visible NPCs are cached already
@@ -2072,6 +2196,7 @@ std::pair<std::string, nc_color> oter_symbol_and_color( const tripoint_abs_omt &
         ret.first = "&";
     } else if( opts.blink && opts.showhordes &&
                overmap_buffer.get_horde_size( omp ) >= HORDE_VISIBILITY_SIZE &&
+               args.vision > om_vision_level::details &&
                ( overmap_ui::get_and_assign_los( args.los, player_character, omp, opts.sight_points ) ||
                  uistate.overmap_debug_mongroup || player_character.has_trait( trait_DEBUG_CLAIRVOYANCE ) ) ) {
         // Display Hordes only when within player line-of-sight
@@ -2083,22 +2208,27 @@ std::pair<std::string, nc_color> oter_symbol_and_color( const tripoint_abs_omt &
     } else if( !opts.sZoneName.empty() && opts.tripointZone.xy() == omp.xy() ) {
         ret.second = c_yellow;
         ret.first = "Z";
+    } else if( cur_ter->blends_adjacent( args.vision ) ) {
+        oter_vision::blended_omt here = oter_vision::get_blended_omt_info( omp, args.vision );
+        ret.first = here.sym;
+        ret.second = here.color;
     } else if( !uistate.overmap_show_forest_trails && cur_ter &&
                ( cur_ter->get_type_id() == oter_type_forest_trail ) ) {
         // If forest trails shouldn't be displayed, and this is a forest trail, then
         // instead render it like a forest.
-        ret = lru ? lru->get_symbol_and_color( oter_forest.id() ) : std::pair<std::string, nc_color> {
-            oter_forest->get_symbol( uistate.overmap_show_land_use_codes ),
-            oter_forest->get_color( uistate.overmap_show_land_use_codes )
+        ret = lru ? lru->get_symbol_and_color( oter_forest.id(),
+        args.vision ) : std::pair<std::string, nc_color> {
+            oter_forest->get_symbol( args.vision, uistate.overmap_show_land_use_codes ),
+            oter_forest->get_color( args.vision, uistate.overmap_show_land_use_codes )
         };
         if( opts.show_explored && overmap_buffer.is_explored( omp ) ) {
             ret.second = c_dark_gray;
         }
     } else {
         // Nothing special, but is visible to the player.
-        ret = lru ? lru->get_symbol_and_color( cur_ter ) : std::pair<std::string, nc_color> {
-            cur_ter->get_symbol( uistate.overmap_show_land_use_codes ),
-            cur_ter->get_color( uistate.overmap_show_land_use_codes )
+        ret = lru ? lru->get_symbol_and_color( cur_ter, args.vision ) : std::pair<std::string, nc_color> {
+            cur_ter->get_symbol( args.vision, uistate.overmap_show_land_use_codes ),
+            cur_ter->get_color( args.vision, uistate.overmap_show_land_use_codes )
         };
         if( opts.show_explored && overmap_buffer.is_explored( omp ) ) {
             ret.second = c_dark_gray;
diff --git a/src/overmapbuffer.cpp b/src/overmapbuffer.cpp
index f482f2f9f7431..7ee54ca5fee4f 100644
--- a/src/overmapbuffer.cpp
+++ b/src/overmapbuffer.cpp
@@ -763,20 +763,28 @@ void overmapbuffer::add_camp( const basecamp &camp )
     om_loc.om->camps.push_back( camp );
 }
 
-bool overmapbuffer::seen( const tripoint_abs_omt &p )
+om_vision_level overmapbuffer::seen( const tripoint_abs_omt &p )
 {
     if( const overmap_with_local_coords om_loc = get_existing_om_global( p ) ) {
         return om_loc.om->seen( om_loc.local );
     }
-    return false;
+    return om_vision_level::unseen;
 }
 
-void overmapbuffer::set_seen( const tripoint_abs_omt &p, bool seen )
+void overmapbuffer::set_seen( const tripoint_abs_omt &p, om_vision_level seen )
 {
     const overmap_with_local_coords om_loc = get_om_global( p );
     om_loc.om->set_seen( om_loc.local, seen );
 }
 
+bool overmapbuffer::seen_more_than( const tripoint_abs_omt &p, om_vision_level test )
+{
+    if( const overmap_with_local_coords om_loc = get_existing_om_global( p ) ) {
+        return om_loc.om->seen( om_loc.local ) > test;
+    }
+    return false;
+}
+
 const oter_id &overmapbuffer::ter( const tripoint_abs_omt &p )
 {
     const overmap_with_local_coords om_loc = get_om_global( p );
@@ -837,7 +845,7 @@ bool overmapbuffer::reveal( const tripoint_abs_omt &center, int radius,
     for( int i = -radius; i <= radius; i++ ) {
         for( int j = -radius; j <= radius; j++ ) {
             const tripoint_abs_omt p = center + point( i, j );
-            if( seen( p ) ) {
+            if( seen( p ) != om_vision_level::unseen ) {
                 continue;
             }
             if( trigdist && i * i + j * j > radius_squared ) {
@@ -847,7 +855,7 @@ bool overmapbuffer::reveal( const tripoint_abs_omt &center, int radius,
                 continue;
             }
             result = true;
-            set_seen( p, true );
+            set_seen( p, om_vision_level::full );
         }
     }
     return result;
@@ -911,7 +919,8 @@ overmap_path_params overmap_path_params::for_aircraft()
 
 static int get_terrain_cost( const tripoint_abs_omt &omt_pos, const overmap_path_params &params )
 {
-    if( params.only_known_by_player && !overmap_buffer.seen( omt_pos ) ) {
+    if( params.only_known_by_player &&
+        !overmap_buffer.seen_more_than( omt_pos, om_vision_level::vague ) ) {
         return -1;
     }
     if( params.avoid_danger && overmap_buffer.is_marked_dangerous( omt_pos ) ) {
@@ -1102,10 +1111,10 @@ bool overmapbuffer::is_findable_location( const tripoint_abs_omt &location,
         return false;
     }
 
-    if( params.must_see && !seen( location ) ) {
+    if( params.must_see && seen( location ) == om_vision_level::unseen ) {
         return false;
     }
-    if( params.cant_see && seen( location ) ) {
+    if( params.cant_see && seen( location ) != om_vision_level::unseen ) {
         return false;
     }
 
@@ -1490,7 +1499,7 @@ city_reference overmapbuffer::closest_known_city( const tripoint_abs_sm &center
     const auto it = std::find_if( cities.begin(), cities.end(),
     [this]( const city_reference & elem ) {
         const tripoint_abs_omt p = project_to<coords::omt>( elem.abs_sm_pos );
-        return seen( p );
+        return seen_more_than( p, om_vision_level::outlines );
     } );
 
     if( it != cities.end() ) {
@@ -1503,8 +1512,15 @@ city_reference overmapbuffer::closest_known_city( const tripoint_abs_sm &center
 std::string overmapbuffer::get_description_at( const tripoint_abs_sm &where )
 {
     const oter_id oter = ter( project_to<coords::omt>( where ) );
-    const nc_color ter_color = oter->get_color();
-    std::string ter_name = colorize( oter->get_name(), ter_color );
+    om_vision_level vision = seen( project_to<coords::omt>( where ) );
+    nc_color ter_color = oter->get_color( vision );
+    std::string ter_name = colorize( oter->get_name( vision ), ter_color );
+    if( oter->blends_adjacent( vision ) ) {
+        oter_vision::blended_omt blended = oter_vision::get_blended_omt_info(
+                                               project_to<coords::omt>( where ), vision );
+        ter_color = blended.color;
+        ter_name = colorize( blended.name, ter_color );
+    }
 
     if( where.z() != 0 ) {
         return ter_name;
diff --git a/src/overmapbuffer.h b/src/overmapbuffer.h
index 2f95248ef2e1b..64bd771262907 100644
--- a/src/overmapbuffer.h
+++ b/src/overmapbuffer.h
@@ -25,6 +25,7 @@
 class basecamp;
 class character_id;
 enum class cube_direction : int;
+enum class om_vision_level : int8_t;
 class map_extra;
 class monster;
 class npc;
@@ -194,8 +195,9 @@ class overmapbuffer
         void delete_extra( const tripoint_abs_omt &p );
         bool is_explored( const tripoint_abs_omt &p );
         void toggle_explored( const tripoint_abs_omt &p );
-        bool seen( const tripoint_abs_omt &p );
-        void set_seen( const tripoint_abs_omt &p, bool seen = true );
+        om_vision_level seen( const tripoint_abs_omt &p );
+        bool seen_more_than( const tripoint_abs_omt &p, om_vision_level test );
+        void set_seen( const tripoint_abs_omt &p, om_vision_level seen );
         bool has_camp( const tripoint_abs_omt &p );
         bool has_vehicle( const tripoint_abs_omt &p );
         bool has_horde( const tripoint_abs_omt &p );
diff --git a/src/panels.cpp b/src/panels.cpp
index 6480a18e63a0d..62edb46a8652d 100644
--- a/src/panels.cpp
+++ b/src/panels.cpp
@@ -171,7 +171,7 @@ void overmap_ui::draw_overmap_chunk( const catacurses::window &w_minimap, const
     const int start_x = start_input.x;
     const point mid( width / 2, height / 2 );
     map &here = get_map();
-    const int sight_points = you.overmap_sight_range( g->light_level( you.posz() ) );
+    const int sight_points = you.overmap_modified_sight_range( g->light_level( you.posz() ) );
 
     oter_display_options opts( global_omt, sight_points );
     if( targ != overmap::invalid_tripoint ) {
@@ -205,8 +205,7 @@ void overmap_ui::draw_overmap_chunk( const catacurses::window &w_minimap, const
             nc_color ter_color;
             std::string ter_sym;
 
-            const bool seen = overmap_buffer.seen( omp );
-            oter_display_args args( seen );
+            oter_display_args args( overmap_buffer.seen( omp ) );
             args.edge_tile = i == left || i == right || j == top || j == bottom;
             std::tie( ter_sym, ter_color ) = oter_symbol_and_color( omp, args, opts );
             // TODO: Build colorized string instead of writing directly to window
diff --git a/src/savegame.cpp b/src/savegame.cpp
index 0ef732a6e23ee..dbb18efdc4345 100644
--- a/src/savegame.cpp
+++ b/src/savegame.cpp
@@ -69,7 +69,7 @@ extern std::map<std::string, std::list<input_event>> quick_shortcuts_map;
  * Changes that break backwards compatibility should bump this number, so the game can
  * load a legacy format loader.
  */
-const int savegame_version = 33;
+const int savegame_version = 34;
 
 /*
  * This is a global set by detected version header in .sav, maps.txt, or overmap.
@@ -932,7 +932,19 @@ void overmap::unserialize_view( const JsonObject &jsobj )
             JsonArray visible_json = view_member;
             for( int z = 0; z < OVERMAP_LAYERS; ++z ) {
                 JsonArray visible_by_z_json = visible_json.next_array();
-                unserialize_array_from_compacted_sequence( visible_by_z_json, layer[z].visible );
+                if( savegame_loading_version < 34 ) {
+                    cata::mdarray<bool, point_om_omt> old_vision;
+                    unserialize_array_from_compacted_sequence( visible_by_z_json, old_vision );
+                    for( int y = 0; y < OMAPY; ++y ) {
+                        for( int x = 0; x < OMAPX; ++x ) {
+                            point_om_omt idx( x, y );
+                            layer[z].visible[idx] = old_vision[idx] ? om_vision_level::full :
+                                                    om_vision_level::unseen;
+                        }
+                    }
+                } else {
+                    unserialize_array_from_compacted_sequence( visible_by_z_json, layer[z].visible );
+                }
                 if( visible_by_z_json.has_more() ) {
                     visible_by_z_json.throw_error( "Too many sequences for z visible view" );
                 }
@@ -995,6 +1007,33 @@ void overmap::unserialize_view( const JsonObject &jsobj )
         }
     }
 }
+template<typename MdArray>
+static void serialize_enum_array_to_compacted_sequence( JsonOut &json, const MdArray &array )
+{
+    using enum_type = typename MdArray::value_type;
+    int count = 0;
+    enum_type lastval = enum_traits<enum_type>::last;
+    for( size_t j = 0; j < MdArray::size_y; ++j ) {
+        for( size_t i = 0; i < MdArray::size_x; ++i ) {
+            const enum_type value = array[i][j];
+            if( value == lastval ) {
+                ++count;
+                continue;
+            }
+            if( count != 0 ) {
+                json.write( count );
+                json.end_array();
+            }
+            lastval = value;
+            json.start_array();
+            json.write( value );
+            count = 1;
+        }
+    }
+    json.write( count );
+    json.end_array();
+}
+
 template<typename MdArray>
 static void serialize_array_to_compacted_sequence( JsonOut &json, const MdArray &array )
 {
@@ -1035,7 +1074,7 @@ void overmap::serialize_view( std::ostream &fout ) const
     json.start_array();
     for( int z = 0; z < OVERMAP_LAYERS; ++z ) {
         json.start_array();
-        serialize_array_to_compacted_sequence( json, layer[z].visible );
+        serialize_enum_array_to_compacted_sequence( json, layer[z].visible );
         json.end_array();
         fout << std::endl;
     }
diff --git a/src/sdltiles.cpp b/src/sdltiles.cpp
index 403006693512d..aae3d01d6766b 100644
--- a/src/sdltiles.cpp
+++ b/src/sdltiles.cpp
@@ -659,11 +659,16 @@ static std::optional<std::pair<tripoint_abs_omt, std::string>> get_mission_arrow
     return std::make_pair( tripoint_abs_omt( arr_pos ), mission_arrow_variant );
 }
 
-std::string cata_tiles::get_omt_id_rotation_and_subtile(
+std::pair<std::string, bool> cata_tiles::get_omt_id_rotation_and_subtile(
     const tripoint_abs_omt &omp, int &rota, int &subtile )
 {
     auto oter_at = []( const tripoint_abs_omt & p ) {
-        const oter_id &cur_ter = overmap_buffer.ter( p );
+        oter_id cur_ter = overmap_buffer.ter( p );
+        om_vision_level vision = overmap_buffer.seen( p );
+        if( cur_ter->blends_adjacent( vision ) ) {
+            oter_vision::blended_omt info = oter_vision::get_blended_omt_info( p, vision );
+            cur_ter = info.id;
+        }
 
         if( !uistate.overmap_show_forest_trails &&
             ( cur_ter->get_type_id() == oter_type_forest_trail ) ) {
@@ -705,7 +710,10 @@ std::string cata_tiles::get_omt_id_rotation_and_subtile(
         ot.get_rotation_and_subtile( rota, subtile );
     }
 
-    return ot_type_id.id().str();
+    om_vision_level vision = overmap_buffer.seen( omp );
+    std::string id = ot_id->get_tileset_id( vision );
+    bool is_omt = id.substr( 0, 3 ) == "om#";
+    return std::make_pair( id.substr( 3 ), is_omt );
 }
 
 static point draw_string( Font &font,
@@ -780,7 +788,7 @@ void cata_tiles::draw_om( const point &dest, const tripoint_abs_omt &center_abs_
     const bool has_debug_vision = you.has_trait( trait_DEBUG_NIGHTVISION );
     // sight_points is hoisted for speed reasons.
     const int sight_points = !has_debug_vision ?
-                             you.overmap_sight_range( g->light_level( you.posz() ) ) :
+                             you.overmap_modified_sight_range( g->light_level( you.posz() ) ) :
                              100;
     const bool showhordes = uistate.overmap_show_hordes;
     const bool show_map_revealed = uistate.overmap_show_revealed_omts;
@@ -797,9 +805,10 @@ void cata_tiles::draw_om( const point &dest, const tripoint_abs_omt &center_abs_
         for( int col = min_col; col < max_col; col++ ) {
             const tripoint_abs_omt omp = origin + point( col, row );
 
-            const bool see = overmap_buffer.seen( omp );
-            const bool los = see && ( you.overmap_los( omp, sight_points ) || uistate.overmap_debug_mongroup ||
-                                      you.has_trait( trait_DEBUG_CLAIRVOYANCE ) );
+            const om_vision_level vision = overmap_buffer.seen( omp );
+            const bool los = overmap_buffer.seen_more_than( omp, om_vision_level::details ) &&
+                             ( you.overmap_los( omp, sight_points ) || uistate.overmap_debug_mongroup ||
+                               you.has_trait( trait_DEBUG_CLAIRVOYANCE ) );
             // the full string from the ter_id including _north etc.
             std::string id;
             TILE_CATEGORY category = TILE_CATEGORY::OVERMAP_TERRAIN;
@@ -816,11 +825,15 @@ void cata_tiles::draw_om( const point &dest, const tripoint_abs_omt &center_abs_
                 } else {
                     id = "unexplored_terrain";
                 }
-            } else if( !see ) {
+            } else if( vision == om_vision_level::unseen ) {
                 id = "unknown_terrain";
             } else {
-                id = get_omt_id_rotation_and_subtile( omp, rotation, subtile );
+                bool is_omt = false;
+                std::tie( id, is_omt ) = get_omt_id_rotation_and_subtile( omp, rotation, subtile );
                 mx = overmap_buffer.extra( omp );
+                if( !is_omt ) {
+                    category = TILE_CATEGORY::OVERMAP_VISION_LEVEL;
+                }
             }
 
             const lit_level ll = overmap_buffer.is_explored( omp ) ? lit_level::LOW : lit_level::LIT;
@@ -840,7 +853,7 @@ void cata_tiles::draw_om( const point &dest, const tripoint_abs_omt &center_abs_
                 }
             }
 
-            if( see ) {
+            if( vision != om_vision_level::unseen ) {
                 if( blink && uistate.overmap_debug_mongroup ) {
                     const std::vector<mongroup *> mgroups = overmap_buffer.monsters_at( omp );
                     if( !mgroups.empty() ) {
@@ -962,7 +975,8 @@ void cata_tiles::draw_om( const point &dest, const tripoint_abs_omt &center_abs_
     // draw nearby seen npcs
     for( const shared_ptr_fast<npc> &guy : npcs_near_player ) {
         const tripoint_abs_omt &guy_loc = guy->global_omt_location();
-        if( guy_loc.z() == center_abs_omt.z() && ( has_debug_vision || overmap_buffer.seen( guy_loc ) ) ) {
+        if( guy_loc.z() == center_abs_omt.z() && ( has_debug_vision ||
+                overmap_buffer.seen_more_than( guy_loc, om_vision_level::details ) ) ) {
             draw_entity_with_overlays( *guy, global_omt_to_draw_position( guy_loc ), lit_level::LIT,
                                        height_3d );
         }
@@ -1029,7 +1043,8 @@ void cata_tiles::draw_om( const point &dest, const tripoint_abs_omt &center_abs_
         for( const city_reference &city : overmap_buffer.get_cities_near(
                  project_to<coords::sm>( center_abs_omt ), radius ) ) {
             const tripoint_abs_omt city_center = project_to<coords::omt>( city.abs_sm_pos );
-            if( overmap_buffer.seen( city_center ) && overmap_area.contains( city_center.raw() ) ) {
+            if( overmap_buffer.seen_more_than( city_center, om_vision_level::outlines ) &&
+                overmap_area.contains( city_center.raw() ) ) {
                 label_bg( city.abs_sm_pos, city.city->name );
             }
         }
@@ -1037,7 +1052,8 @@ void cata_tiles::draw_om( const point &dest, const tripoint_abs_omt &center_abs_
         for( const camp_reference &camp : overmap_buffer.get_camps_near(
                  project_to<coords::sm>( center_abs_omt ), radius ) ) {
             const tripoint_abs_omt camp_center = project_to<coords::omt>( camp.abs_sm_pos );
-            if( overmap_buffer.seen( camp_center ) && overmap_area.contains( camp_center.raw() ) ) {
+            if( overmap_buffer.seen_more_than( camp_center, om_vision_level::outlines ) &&
+                overmap_area.contains( camp_center.raw() ) ) {
                 label_bg( camp.abs_sm_pos, camp.camp->name );
             }
         }
@@ -1060,7 +1076,8 @@ void cata_tiles::draw_om( const point &dest, const tripoint_abs_omt &center_abs_
         }
     }
 
-    if( has_debug_vision || overmap_buffer.seen( center_abs_omt ) ) {
+    if( has_debug_vision ||
+        overmap_buffer.seen_more_than( center_abs_omt, om_vision_level::details ) ) {
         for( const auto &npc : npcs_near_player ) {
             if( !npc->marked_for_death && npc->global_omt_location() == center_abs_omt ) {
                 notes_window_text.emplace_back( npc->basic_symbol_color(), npc->get_name() );
diff --git a/src/type_id.h b/src/type_id.h
index d3164eee1d3b6..5cb6ddc03a187 100644
--- a/src/type_id.h
+++ b/src/type_id.h
@@ -201,6 +201,9 @@ struct oter_type_t;
 using oter_type_id = int_id<oter_type_t>;
 using oter_type_str_id = string_id<oter_type_t>;
 
+class oter_vision;
+using oter_vision_id = string_id<oter_vision>;
+
 class overmap_connection;
 using overmap_connection_id = string_id<overmap_connection>;
 
diff --git a/tests/mutation_test.cpp b/tests/mutation_test.cpp
index d6bfb34c704e7..418a0e9596abe 100644
--- a/tests/mutation_test.cpp
+++ b/tests/mutation_test.cpp
@@ -349,31 +349,31 @@ TEST_CASE( "OVERMAP_SIGHT_enchantment_affect_overmap_sight_range", "[mutations][
 
     WHEN( "character has no traits, that change overmap sight range" ) {
         THEN( "unchanged sight range" ) {
-            CHECK( dummy.overmap_sight_range( 100.0f ) == 10.0 );
+            CHECK( dummy.overmap_modified_sight_range( 100.0f ) == 10.0 );
         }
     }
 
     WHEN( "character has TEST_OVERMAP_SIGHT_5" ) {
         dummy.toggle_trait( trait_TEST_OVERMAP_SIGHT_5 );
         THEN( "they have increased overmap sight range" ) {
-            CHECK( dummy.overmap_sight_range( 100.0f ) == 15.0 );
+            CHECK( dummy.overmap_modified_sight_range( 100.0f ) == 15.0 );
         }
         // Regression test for #42853
         THEN( "having another trait does not cancel the TEST_OVERMAP_SIGHT_5 trait" ) {
             dummy.toggle_trait( trait_SMELLY );
-            CHECK( dummy.overmap_sight_range( 100.0f ) == 15.0 );
+            CHECK( dummy.overmap_modified_sight_range( 100.0f ) == 15.0 );
         }
     }
 
     WHEN( "character has TEST_OVERMAP_SIGHT_MINUS_10 trait" ) {
         dummy.toggle_trait( trait_TEST_OVERMAP_SIGHT_MINUS_10 );
         THEN( "they have reduced overmap sight range" ) {
-            CHECK( dummy.overmap_sight_range( 100.0f ) == 3.0 );
+            CHECK( dummy.overmap_modified_sight_range( 100.0f ) == 3.0 );
         }
         // Regression test for #42853
         THEN( "having another trait does not cancel the TEST_OVERMAP_SIGHT_MINUS_10 trait" ) {
             dummy.toggle_trait( trait_SMELLY );
-            CHECK( dummy.overmap_sight_range( 100.0f ) == 3.0 );
+            CHECK( dummy.overmap_modified_sight_range( 100.0f ) == 3.0 );
         }
     }
 }
diff --git a/tests/submap_load_test.cpp b/tests/submap_load_test.cpp
index fde024f3bd216..5bdb5be306a89 100644
--- a/tests/submap_load_test.cpp
+++ b/tests/submap_load_test.cpp
@@ -851,7 +851,7 @@ static JsonValue submap_fd_pre_migration = json_loader::from_string( submap_fd_p
 static void load_from_jsin( submap &sm, const JsonValue &jsin )
 {
     // Ensure that the JSON is up to date for our savegame version
-    REQUIRE( savegame_version == 33 );
+    REQUIRE( savegame_version == 34 );
     int version = 0;
     JsonObject sm_json = jsin.get_object();
     if( sm_json.has_member( "version" ) ) {
diff --git a/tests/widget_test.cpp b/tests/widget_test.cpp
index 95a4573ccbd53..48a7ce5202638 100644
--- a/tests/widget_test.cpp
+++ b/tests/widget_test.cpp
@@ -1954,7 +1954,7 @@ static void fill_overmap_area( const avatar &ava, const oter_id &oter )
         for( int y = -1; y <= 1; ++y ) {
             const tripoint offset( x, y, 0 );
             overmap_buffer.ter_set( ava_pos + offset, oter );
-            overmap_buffer.set_seen( ava_pos + offset, true );
+            overmap_buffer.set_seen( ava_pos + offset, om_vision_level::full );
         }
     }
 }