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Cache WMTS

Cache disk QGIS server plugin for WMTS tiles

WMTS tile parameters

  • LAYER (layer, group or complete project according to project configuration)
  • TILEMATRIXSET (CRS)
  • TILEMATRIX (z as tms)
  • TILEROW (x as tms)
  • TILE COL (y as tms)
  • FORMAT (Image mime type: image/*)

See https://georezo.net/wiki/main/standards/wmts

Plugin configuration

The plugin is configured with environment variables:

QGIS_WMTS_CACHE_ROOTDIR

Root directory for cached data

Default to: tempfile.getmpdir()/org.qgis.wmts/

QGIS_WMTS_CACHE_LAYOUT

Storage layout for tiles

Possible values: tc,mp,tms,reverse_tms

Default value: tc

Layouts

  • tc: TileCache compatible layout, (zz/xxx/xxx/xxx/yyy/yyy/yyy.format)
  • mp: MapProxy layout (zz/xxxx/xxxx/yyyy/yyyy.format), moins de niveaux de repertoire
  • tms: TMS compatible layout (zz/xxxx/yyyy.format)

The layout must be chosen according to the expected size of the cache: more the cache contains elements, more the number of directory levels must be important.

CLI manager Installation

A cli manager command may be installed in the python environment using standard setuptools/pip installation.

Once installed, the wmtscache cache command can be used to manage the cache content:

  • list cache content infos
  • delete project cache content
  • delete specific layer cached tiles

WMTS Cache manager API

The WMTS Cache manager API provides these URLs:

  • /wmtscache/?
    • to get information on the WMTS disk cache
  • /wmtscache/collections/?
    • to get the list of collections, QGIS projects, that have WMTS disk cache
  • /wmtscache/collection/(?<collectionId>[^/]+)/?
    • to get information on a collection, QGIS project, WMTS disk cache
    • to delete the collection, QGIS Project, WMTS disk cache
  • /wmtscache/collection/(?<collectionId>[^/]+)/docs/?
    • to get information on a collection, QGIS project, WMTS documents disk cache
    • to delete the collection, QGIS Project, WMTS documents disk cache
  • /wmtscache/collection/(?<collectionId>[^/]+)/layers/?
    • to get information on a collection, QGIS project, WMTS layers tiles disk cache
    • to delete the collection, QGIS Project, WMTS layers tiles disk cache
  • /wmtscache/collection/(?<collectionId>[^/]+)/layers/(?<layerid>[^/]+)/?
    • to get information on a collection, QGIS project, WMTS layer tiles disk cache
    • to delete the collection, QGIS Project, WMTS layer tiles disk cache

To delete some cache, you have to use Delete HTTP method over the dedicated URL.