[Qgis-developer] WMS provider: Cannot calculate extent
Casper Børgesen (CABO)
CABO at NIRAS.DK
Mon Feb 15 02:19:26 PST 2016
Hi Pedro,
Thanks for the answer, it worked.
I guess my question now is, why do we have a cache on the GetCapabilities request? I guess some WMS servers provide a rather large response and the fast lookup in a (how old?) cache is preferred in many situations – at least when you know the capabilities haven’t changed.
But I don’t think this is user friendly at all. If I clear the cache, I get a new capabilities response which works. But I have to know, that it is the Settings/Options/Network/Cache Settings I have to clear (which doesn’t specify that it will clear the WMS capabilities and the user don’t know that it is cached). Wouldn’t it be better with a clear cache option for the given WMS server selection? This way the user can clear the cache if something doesn’t work or a newly published layer is missing, and the user can do it where the problem is occurred.
Regards, Casper
From: Pedro Venâncio [mailto:pedrongvenancio at gmail.com]
Sent: 15. februar 2016 10:39
To: Casper Børgesen (CABO)
Cc: qgis-developer at lists.osgeo.org
Subject: Re: [Qgis-developer] WMS provider: Cannot calculate extent
Hi Casper,
Just clean the WMS cache on QGIS: Settings -> Options -> Network -> Cache settings -> clear
Best regards,
Pedro Venâncio
2016-02-15 9:14 GMT+00:00 Casper Børgesen (CABO) <CABO at niras.dk<mailto:CABO at niras.dk>>:
I have a strange situation. I host two different WMS layers on an internal GeoServer 2.8.2 (type is ImagePyramid) and both layers look fine when previewing them in the GeoServer Layer Preview. I use QGIS Master x64 (latest nightly build from OSGeo4w) to access the layers.
One of them gets added to the map the other one doesn’t and give me the following message:
WMS provider: Cannot calculate extent
(..\..\..\..\..\..\src\providers\wms\qgswmsprovider.cpp : 148 : QgsWmsProvider::QgsWmsProvider)
Raster layer: Provider is not valid (provider: wms, URI: contextualWMSLegend=0&crs=EPSG:25832&dpiMode=7&featureCount=10&format=image/png&layers=myns:layer_not_working&styles=&url=http://myserver:8080/geoserver/wms
(..\..\..\..\..\src\core\raster\qgsrasterlayer.cpp : 668 : QgsRasterLayer::setDataProvider)
By sniffing the GetCapabilities request sent by QGIS using Fiddler, I get the following two layer definitions in return:
Working layer:
<Layer queryable="1" opaque="0">
<Name>myns:layer_working</Name>
<Title>Layer working</Title>
<Abstract/>
<KeywordList>
<Keyword>WCS</Keyword>
<Keyword>ImagePyramid</Keyword>
<Keyword>layer_a</Keyword>
</KeywordList>
<CRS>EPSG:25832</CRS>
<CRS>CRS:84</CRS>
<EX_GeographicBoundingBox>
<westBoundLongitude>11.220126802325543</westBoundLongitude>
<eastBoundLongitude>11.893382022184314</eastBoundLongitude>
<southBoundLatitude>55.552736929684166</southBoundLatitude>
<northBoundLatitude>56.104558130983634</northBoundLatitude>
</EX_GeographicBoundingBox>
<BoundingBox CRS="CRS:84"
minx="11.220126802325543"
miny="55.552736929684166"
maxx="11.893382022184314"
maxy="56.104558130983634"/>
<BoundingBox CRS="EPSG:25832"
minx="639998.4"
miny="6159999.9999999665"
maxx="680001.6"
maxy="6219999.999999972"/>
<Style>
<Name>raster</Name>
<Title>Default Raster</Title>
<Abstract>A sample style that draws a raster, good for displaying imagery</Abstract>
<LegendURL width="20" height="20">
<Format>image/png</Format>
<OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:type="simple" xlink:href="http://myserver:8080/geoserver/ows?service=WMS&request=GetLegendGraphic&format=image%2Fpng&width=20&height=20&layer=myns%layer_working<http://myserver:8080/geoserver/ows?service=WMS&request=GetLegendGraphic&format=image%2Fpng&width=20&height=20&layer=myns%25layer_working>"/>
</LegendURL>
</Style>
</Layer>
Layer not working:
<Layer queryable="1" opaque="0">
<Name>myns:Layer_not_working</Name>
<Title>Layer not working</Title>
<Abstract/>
<KeywordList>
<Keyword>WCS</Keyword>
<Keyword>ImagePyramid</Keyword>
<Keyword>layer_b</Keyword>
</KeywordList>
<CRS>EPSG:25832</CRS>
<CRS>CRS:84</CRS>
<EX_GeographicBoundingBox>
<westBoundLongitude>10.582520521148165</westBoundLongitude>
<eastBoundLongitude>12.236951289179972</eastBoundLongitude>
<southBoundLatitude>55.45523075908682</southBoundLatitude>
<northBoundLatitude>56.38403418056449</northBoundLatitude>
</EX_GeographicBoundingBox>
<BoundingBox CRS="CRS:84"
minx="10.582520521148165"
miny="55.45523075908682"
maxx="12.236951289179972"
maxy="56.38403418056449"/>
<BoundingBox CRS="EPSG:25832"
minx="600000.00000002"
miny="6149999.999999966"
maxx="700000.0000000303"
maxy="6249999.999999976"/>
<Style>
<Name>raster</Name>
<Title>Default Raster</Title>
<Abstract>A sample style that draws a raster, good for displaying imagery</Abstract>
<LegendURL width="20" height="20">
<Format>image/png</Format>
<OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:type="simple" xlink:href="http://myserver:8080/geoserver/ows?service=WMS&request=GetLegendGraphic&format=image%2Fpng&width=20&height=20&layer=myns%layer_not_working<http://myserver:8080/geoserver/ows?service=WMS&request=GetLegendGraphic&format=image%2Fpng&width=20&height=20&layer=myns%25layer_not_working>"/>
</LegendURL>
</Style>
</Layer>
I have anonymized the messages above (since the error doesn’t point in the direction of naming) and I can of course provide more information if needed.
Regards, Casper
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