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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">I read from the GetCapabilities that the URL template is like …/{Style}/{TileMatrixSet}/{TileMatrix}/{TileRow}/{TileCol}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">The size of tile matrix 1 “<ows:Identifier>1</ows:Identifier>” is
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><MatrixWidth>4</MatrixWidth><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><MatrixHeight>3</MatrixHeight><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><br>
The WMTS standard tells about TileCol<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">“…else SHALL be any integer value between 0 and
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">MatrixWidth – 1, see Table 14, (both included)”<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Thus TileCol 3 SHALL exist, but on that server it does not seem to exist. I think it is clearly a server error. If the server does not have TileCol=3 intentionally, it should advertise
that with TileMatrixSetLimits in the GetCapabilities.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">I may be wrong, I have not been reading and interpreting the WMTS standard super much.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">-Jukka Rahkonen-<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>Lähettäjä:</b> gdal-dev <gdal-dev-bounces@lists.osgeo.org>
<b>Puolesta </b>Michal Kowalczuk via gdal-dev<br>
<b>Lähetetty:</b> tiistai 10. joulukuuta 2024 23.52<br>
<b>Vastaanottaja:</b> gdal-dev@lists.osgeo.org<br>
<b>Aihe:</b> [gdal-dev] WMTS Possible rounding error<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi,<o:p></o:p></p>
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<p class="MsoNormal">Consider the following WMTS service:<o:p></o:p></p>
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<p class="MsoNormal"><i>WMTS:<a href="https://basemap.nationalmap.gov/arcgis/rest/services/USGSHydroCached/MapServer/WMTS/1.0.0/WMTSCapabilities.xml?SERVICE=WMTS&REQUEST=GetCapabilities&VERSION=1.0.0,layer=USGSHydroCached,tilematrixset=default028mm">https://basemap.nationalmap.gov/arcgis/rest/services/USGSHydroCached/MapServer/WMTS/1.0.0/WMTSCapabilities.xml?SERVICE=WMTS&REQUEST=GetCapabilities&VERSION=1.0.0,layer=USGSHydroCached,tilematrixset=default028mm</a></i><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">and try to get whole extent:<o:p></o:p></p>
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<p class="MsoNormal"><b>gdal_translate -srcwin 0 0 1852166785 1511812353 -outsize 570 465 "WMTS:<a href="https://basemap.nationalmap.gov/arcgis/rest/services/USGSHydroCached/MapServer/WMTS/1.0.0/WMTSCapabilities.xml?SERVICE=WMTS&REQUEST=GetCapabilities&VERSION=1.0.0,layer=USGSHydroCached,tilematrixset=default028mm">https://basemap.nationalmap.gov/arcgis/rest/services/USGSHydroCached/MapServer/WMTS/1.0.0/WMTSCapabilities.xml?SERVICE=WMTS&REQUEST=GetCapabilities&VERSION=1.0.0,layer=USGSHydroCached,tilematrixset=default028mm</a>"
tile.png --debug on --config GDAL_ENABLE_WMS_CACHE NO</b><o:p></o:p></p>
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<p class="MsoNormal">(where 1852166785 1511812353 is a raster size)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">GDAL creates 4 requests:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><i>HTTP: Requesting [1/4] <a href="https://basemap.nationalmap.gov/arcgis/rest/services/USGSHydroCached/MapServer/WMTS/tile/1.0.0/USGSHydroCached/default/default028mm/1/0/0">
https://basemap.nationalmap.gov/arcgis/rest/services/USGSHydroCached/MapServer/WMTS/tile/1.0.0/USGSHydroCached/default/default028mm/1/0/0</a><br>
HTTP: Requesting [2/4] <a href="https://basemap.nationalmap.gov/arcgis/rest/services/USGSHydroCached/MapServer/WMTS/tile/1.0.0/USGSHydroCached/default/default028mm/1/0/1">
https://basemap.nationalmap.gov/arcgis/rest/services/USGSHydroCached/MapServer/WMTS/tile/1.0.0/USGSHydroCached/default/default028mm/1/0/1</a><br>
HTTP: Requesting [3/4] <a href="https://basemap.nationalmap.gov/arcgis/rest/services/USGSHydroCached/MapServer/WMTS/tile/1.0.0/USGSHydroCached/default/default028mm/1/0/2">
https://basemap.nationalmap.gov/arcgis/rest/services/USGSHydroCached/MapServer/WMTS/tile/1.0.0/USGSHydroCached/default/default028mm/1/0/2</a><br>
HTTP: Requesting [4/4] <b><a href="https://basemap.nationalmap.gov/arcgis/rest/services/USGSHydroCached/MapServer/WMTS/tile/1.0.0/USGSHydroCached/default/default028mm/1/0/3">https://basemap.nationalmap.gov/arcgis/rest/services/USGSHydroCached/MapServer/WMTS/tile/1.0.0/USGSHydroCached/default/default028mm/1/0/3</a></b></i><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">where the last tile does not exist. So it probably should stop at /1/0/2.<o:p></o:p></p>
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<p class="MsoNormal">Isn't it a rounding error?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best regards<o:p></o:p></p>
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<p class="MsoNormal">Micha³ Kowalczuk<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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