WMTS data source

[ebelo]

WMTS is THE OGC standard to provide, for example, aerial imagery in a fast an efficient way, as tiles can be pregenerated.

As a lot of Spatial Data Infrastructure (SDI) already provide WMTS services for the imagery, having a WMTS data source in Cesium would allow to share the same data.

Some technical considerations:

• A RestFull implementation would be prefered over KVP.
• The grid can be irregular, ie not the OSM way 1-4-16. See for example: http://api3.geo.admin.ch/services/sdiservices.html#getcapabilities
• Only spherical mercator is needed. No local projections.

[pjcozzi]

@ebelo do you need the time-dynamic part of WMTS?

CC #526

[ebelo]

I believe, we don't need time-dynamic WTMS at this stage. The WMTS directoriy structure is typically organized so (look for Time):

<protocol>://<ServerName>/<ProtocoleVersion>/<LayerName>/<Stylename>/**<Time>**/<TileMatrixSet>/<TileSetId>/<TileRow>/<TileCol>.<FormatExtension>

This means, we have different directories for the tiles depending on the year of acquisition. I believe we can handle different version of the imagery by referring to different layers in the cesium configuration.

[pjcozzi]

Initial support was contributed by @gcebelieu in #1988.