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.