diff --git a/api/src/main/scala/Geoprocessing.scala b/api/src/main/scala/Geoprocessing.scala
index 7cb30e1..4770dd2 100644
--- a/api/src/main/scala/Geoprocessing.scala
+++ b/api/src/main/scala/Geoprocessing.scala
@@ -95,7 +95,7 @@ trait Geoprocessing extends Utils {
     lines: Seq[MultiLine]
   ): Map[String, Int] = {
     val metadata = rasterLayers.head.metadata
-    var pixelGroups: TrieMap[(List[Int], TilePixel), Int] = TrieMap.empty
+    val pixelGroups: TrieMap[(List[Int], TilePixel), Int] = TrieMap.empty
 
     joinCollectionLayers(rasterLayers).par
       .foreach({ case (key, tiles) =>
@@ -223,7 +223,7 @@ trait Geoprocessing extends Utils {
     // assume all the layouts are the same
     val metadata = rasterLayers.head.metadata
 
-    var pixelGroups: TrieMap[List[Int], LongAdder] = TrieMap.empty
+    val pixelGroups: TrieMap[List[Int], LongAdder] = TrieMap.empty
 
     joinCollectionLayers(rasterLayers).par
       .foreach({ case (key, tiles) =>
diff --git a/api/src/main/scala/Utils.scala b/api/src/main/scala/Utils.scala
index 7846ba9..0a34f26 100644
--- a/api/src/main/scala/Utils.scala
+++ b/api/src/main/scala/Utils.scala
@@ -4,12 +4,10 @@ import scala.concurrent.Future
 import scala.concurrent.ExecutionContext.Implicits.global
 
 import spray.json._
-import spray.json.DefaultJsonProtocol._
 
 import geotrellis.proj4.{CRS, ConusAlbers, LatLng, WebMercator}
 
 import geotrellis.raster._
-import geotrellis.raster.rasterize._
 import geotrellis.vector._
 import geotrellis.vector.io._
 import geotrellis.spark._