Problem with WMTS TileMatrix-values in some viewers

[tbonfort]

Some viewers (like the Geocortex Silverlight Viewer and arcgis.com) won't show wmts-tilesets because of a discrepancy in the capabilities provided by mapcache. These viewers expect a TileMatrix-value in a TileMatrixSetLink to be the same as/correspond with the ows:Identifier-value for the TileMatrix in the TileMatrixSet.

[tbonfort]

@rillat, it would be helpful if you could post a diff between a working and failing capabilities document.

[rillat]

I don't have a full working capabilities document.

Currently the capabilities are like this:

...
<TileMatrixSetLink>
<TileMatrixSet>GoogleMaps</TileMatrixSet>
<TileMatrixSetLimits>
<TileMatrixLimits>
<TileMatrix>GoogleMaps:0</TileMatrix>
<MinTileRow>0</MinTileRow>
<MaxTileRow>0</MaxTileRow>
<MinTileCol>0</MinTileCol>
<MaxTileCol>0</MaxTileCol>
</TileMatrixLimits>
...
<TileMatrixSet>
<ows:Identifier>GoogleMaps</ows:Identifier>
<ows:BoundingBox crs="urn:ogc:def:crs:EPSG:6.3:3857">
<ows:LowerCorner>-20037508.342789 -20037508.342789</ows:LowerCorner>
<ows:UpperCorner>20037508.342789 20037508.342789</ows:UpperCorner>
</ows:BoundingBox>
<ows:SupportedCRS>urn:ogc:def:crs:EPSG:6.3:3857</ows:SupportedCRS>
<WellKnownScaleSet>urn:ogc:def:wkss:OGC:1.0:GoogleMapsCompatible</WellKnownScaleSet>
<TileMatrix>
<ows:Identifier>0</ows:Identifier>
<ScaleDenominator>559082264.02871787548065185547</ScaleDenominator>
<TopLeftCorner>-20037508.342789 20037508.342789</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>1</MatrixWidth>
<MatrixHeight>1</MatrixHeight>
</TileMatrix>
...

As pointed out to me by users of the viewers mentioned above it should be like this:

...
<TileMatrixSetLink>
<TileMatrixSet>GoogleMaps</TileMatrixSet>
<TileMatrixSetLimits>
<TileMatrixLimits>
<TileMatrix>0</TileMatrix>
<MinTileRow>0</MinTileRow>
<MaxTileRow>0</MaxTileRow>
<MinTileCol>0</MinTileCol>
<MaxTileCol>0</MaxTileCol>
</TileMatrixLimits>
...
<TileMatrixSet>
<ows:Identifier>GoogleMaps</ows:Identifier>
<ows:BoundingBox crs="urn:ogc:def:crs:EPSG:6.3:3857">
<ows:LowerCorner>-20037508.342789 -20037508.342789</ows:LowerCorner>
<ows:UpperCorner>20037508.342789 20037508.342789</ows:UpperCorner>
</ows:BoundingBox>
<ows:SupportedCRS>urn:ogc:def:crs:EPSG:6.3:3857</ows:SupportedCRS>
<WellKnownScaleSet>urn:ogc:def:wkss:OGC:1.0:GoogleMapsCompatible</WellKnownScaleSet>
<TileMatrix>
<ows:Identifier>0</ows:Identifier>
<ScaleDenominator>559082264.02871787548065185547</ScaleDenominator>
<TopLeftCorner>-20037508.342789 20037508.342789</TopLeftCorner>
<TileWidth>256</TileWidth>
<TileHeight>256</TileHeight>
<MatrixWidth>1</MatrixWidth>
<MatrixHeight>1</MatrixHeight>
</TileMatrix>
...

...

[tbonfort]

@rillat please confirm that the provided fix is OK

[rillat]

Fix makes WMTS unusable in Qgis. Further investigation is needed into why the mentioned viewers don't accept the mapcache WMTS.