[gdal-dev] WMTS generating GET URL problem

[Rahkonen Jukka]

Hi,

By the standard Web Map Tile Service - Open Geospatial Consortium<https://www.ogc.org/publications/standard/wmts/> "style" seems to be mandatory in the layer data "One or more (mandatory)".
And within "style", the identifier is mandatory "An unambiguous reference to this style, identifying a specific version when needed, normally used by software"; multiplicity: One (mandatory).
I would say that this is a server side misconfiguration. Each style must have an identifier, even the default style. But the server does still understand the style named as "default":
https://geoservices-urbis.irisnet.be/geowebcache/service/wmts/rest/Ortho/default/EPSG:4326/EPSG:4326:7/27/129?format=image/jpeg

-Jukka Rahkonen-

Lähettäjä: gdal-dev <gdal-dev-bounces at lists.osgeo.org> Puolesta Michal Kowalczuk via gdal-dev
Lähetetty: perjantai 13. joulukuuta 2024 14.43
Vastaanottaja: gdal-dev at lists.osgeo.org
Aihe: Re: [gdal-dev] WMTS generating GET URL problem

Sorry for the mistake in the last email. Instead of pasting gfdalinfo command i should paste this:
gdal_translate -srcwin 0 0 12235811 6137602 -outsize 512 512 "WMTS:https://geoservices-urbis.irisnet.be/geoserver/gwc/service/wmts?SERVICE=WMTS&REQUEST=GetCapabilities&VERSION=1.0.0,layer=Ortho,tilematrixset=EPSG:4326" tile.png --debug on --config GDAL_ENABLE_WMS_CACHE NO

pt., 13 gru 2024 o 13:15 Michał Kowalczuk <michkowalczuk at gmail.com<mailto:michkowalczuk at gmail.com>> napisał(a):
Hi,
Consider the following WMTS server:
https://geoservices-urbis.irisnet.be/geoserver/gwc/service/wmts

One of the subdataset path generated by GDAL is
WMTS:https://geoservices-urbis.irisnet.be/geoserver/gwc/service/wmts?SERVICE=WMTS&REQUEST=GetCapabilities&VERSION=1.0.0,layer=Ortho,tilematrixset=EPSG:4326

When I try to download a map I notice URL issue/error.
gdalinfo "WMTS:https://geoservices-urbis.irisnet.be/geoserver/gwc/service/wmts?SERVICE=WMTS&REQUEST=GetCapabilities&VERSION=1.0.0,layer=Ortho,tilematrixset=EPSG:4326" tile.png --debug on --config GDAL_ENABLE_WMS_CACHE NO

from debug:
HTTP: Requesting [1/4] https://geoservices-urbis.irisnet.be/geowebcache/service/wmts/rest/Ortho//EPSG:4326/EPSG:4326:7/27/129?format=image/jpeg
look at the double slash (//) chars in the above URL

When you go to service Capabilities you can find the following resource URL:
 <ResourceURL format="image/jpeg" resourceType="tile" template="https://geoservices-urbis.irisnet.be/geowebcache/service/wmts/rest/urbisNL/{style}/{TileMatrixSet}/{TileMatrix}/{TileRow}/{TileCol}?format=image/jpeg"/>

but in the layer definition Style tag is empty:
<Style isDefault="true">
<ows:Identifier/>
</Style>

This is probably the reason that GDAL make path using an empty string and this generate double slash chars.

If you remove redundant slash the server responses and returns a tile, the example:
https://geoservices-urbis.irisnet.be/geowebcache/service/wmts/rest/Ortho/EPSG:4326/EPSG:4326:14/3567/16784?format=image/jpeg

And the question is: is this service or GDAL bug?  :-)

Wouldn't it be a good idea for GDAL to check the URL path for correctness before sending the request?

Regards,
Michał


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