Bug report #17875
WFS zingers, 3D
|Category:||Web Services clients/WFS|
|Affected QGIS version:||2.18.15||Regression?:||No|
|Operating System:||Windows 7 Enterprise 64 bit||Easy fix?:||No|
|Pull Request or Patch supplied:||No||Resolution:||end of life|
|Crashes QGIS or corrupts data:||Yes||Copied to github as #:||25770|
This WFS service http://geoweb01.gasnet.dk:8080/geoserver/Test/ows? (username Test password Test )
displays incorrectly in QGIS 2.18.14 and 2.18.15 - the map extent should be around 20km, but it creates zingers 8,000 km long. See WFS.jpg
In WMS.jpg the blue lines are what should be displayed - here, it's the same data from a WMS service. The green is the same data but as WFS.
The zingers go from the correct UTM32 X,Y coordinates top left to those coordinates reversed, bottom right (X has become Y and vice versa).
This was not a problem in earlier versions of QGIS desktop - we upgraded from 2.12.
The problem seems to be that it's 3D linear data.
We have created these WFS and WMS services with GeoServer 2.8.1. The solution turns out to be setting the WFS service in GeoServer to Strict CITE compliance - this changes the WFS data to 2D, and QGIS displayes it correctly.
Other WFS clients ( GeoMedia 015, and uDig) display the WFS data no matter what. We can set our own WFS service to 2D, but there must be other WFS services with 3D linear data where QGIS cannot display it correctly.
#2 Updated by Even Rouault over 3 years ago
- Priority changed from High to Low
The issue is that the GML sent by the server is invalid/inconsistant. "http://Test:[email protected]:8080/geoserver/Test/wfs?SERVICE=WFS&REQUEST=GetFeature&VERSION=2.0.0&TYPENAMES=Test:TRANSLEDNINGER820&COUNT=1&SRSNAME=urn:ogc:def:crs:EPSG::25832" returns
<gml:LineString srsName="urn:ogc:def:crs:EPSG::25832" srsDimension="3">
<gml:posList>530142.198325 6297941.867202 530141.176196 6297941.977687</gml:posList>
One clearly see that there are 2 (x,y) tuples, but z is missing despite the srsDimension="3". Likely older versions of QGIS would ignore the srsDimension (and would then have issues on actual 3D data)
I don't see a bullet proof way of autofixing this on QGIS side. Sometimes if the number of elements is not a multiple of 3, we could. But in other cases, like if there are 6 values, this could be 3 XY nodes or 2 XYZ nodes.
We could potentially add a WFS user controlled option "Ignore srsDimension="3"", but I'd prefer we do not to avoid adding more complexity again. Best is to fix the server IMHO
#4 Updated by Giovanni Manghi almost 3 years ago
- Resolution set to end of life
- Status changed from Feedback to Closed
End of life notice: QGIS 2.18 LTR
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