[MapProxy] Problems with WMTS grid configuration in MapProxy

[Daniel L.S.]

Hi,

we are trying to configure a WMS service from our WMTS Geoserver service. Only we have successful results when we define the bounding box of the gridset at geoserver with "compute from maximum extent of CRS" option. 

When we use a custom bounding box we always get an offset of tiles.

This is our WMTS capabilities:

<TileMatrixSet>
    <ows:Identifier>EPSG:25831</ows:Identifier>
    <ows:SupportedCRS>urn:ogc:def:crs:EPSG::25831</ows:SupportedCRS>
    <TileMatrix>
        <ows:Identifier>EPSG:25831:0</ows:Identifier>
        <ScaleDenominator>3.1180245535714287E7</ScaleDenominator>
        <TopLeftCorner>-1615000.0 5235000.0</TopLeftCorner>
        <TileWidth>256</TileWidth>
        <TileHeight>256</TileHeight>
        <MatrixWidth>1</MatrixWidth>
        <MatrixHeight>1</MatrixHeight>
    </TileMatrix>
    <TileMatrix>
        <ows:Identifier>EPSG:25831:1</ows:Identifier>
        <ScaleDenominator>1.5590122767857144E7</ScaleDenominator>
        <TopLeftCorner>-1615000.0 5235000.0</TopLeftCorner>
        <TileWidth>256</TileWidth>
        <TileHeight>256</TileHeight>
        <MatrixWidth>2</MatrixWidth>
        <MatrixHeight>2</MatrixHeight>
    </TileMatrix>
....



We defined 22 zoom levels 

and our .yaml:

grids:

    geobase_grupo_grid:
      srs: 'EPSG:25831'
      bbox: [-1615000, 3000000, 620000, 5000000] # BBox geoserver gridset
      bbox_srs: 'EPSG:25831'
      origin: 'nw'
      res: [
         #  res            level     scale @90.7 DPI
         8730.4687500000, #  0    31180245.53571429
         4365.2343750000, #  1    15590122.76785714
         2182.6171875000, #  2     7795061.38392857
         1091.3085937500, #  3     3897530.69196429
          545.6542968750, #  4     1948765.34598214
          272.8271484375, #  5      974382.67299107
          136.4135742188, #  6      487191.33649554
           68.2067871094, #  7      243595.66824777
           34.1033935547, #  8      121797.83412388
           17.0516967773, #  9       60898.91706194
            8.5258483887, # 10       30449.45853097
            4.2629241943, # 11       15224.72926549
            2.1314620972, # 12        7612.36463274
            1.0657310486, # 13        3806.18231637
            0.5328655243, # 14        1903.09115819
            0.2664327621, # 15         951.54557909
            0.1332163811, # 16         475.77278955
            0.0666081905, # 17         237.88639477
            0.0333040953, # 18         118.94319739
            0.0166520476, # 19          59.47159869
            0.0083260238, # 20          29.73579935
            0.0041630119, # 21          14.86789967
    ]


Our problem starts with the definition of our gridset bbox in mapproxy because in geoserver we have 
 [-1615000, 3000000, 620000, 5000000]  but this definition in the capabilities show <TopLeftCorner>-1615000.0 5235000.0</TopLeftCorner> result for that gridset. We don't understand than differences.

Some help, tips would be welcome!

Thanks a lot!
  		 	   		  
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