QGIS/GeoServer WFS 3D geometry

[Mike Bundock]

Hi.  If I add layers that are coming directly from PostGIS that are 3D (eg. with LinestringZ geometries), then querying  the features exposes their z values and I can capture and set the z values using the advanced digitizing panel.

However, if i add the same table as a published WFS layer (published via geoserver) it only appears as a 2D geometry and z values cannot be set or interrogated. 

It is possible that I need to force use of GML3 in geoserver somehow.

Does anyone know how to get 3D data published via WFS from geoserver?

any assistance gratefully received.

regards

Mike

[Mike Bundock]

As far as I can tell, geoserver is publishing the data correctly with 3D coordinates.  

Firstly the DescribeFeatureType request identifies that GML3.2 is being used and that the geometry field is of type curve:

       name="geom" nillable="true" type="gml:CurvePropertyType"

GML3.2 specifies that a CurvePropertyType can be one of the following:

• AbstractCurve
• LineString
• Curve
• OrientableCurve
• CompositeCurve

And in the GetFeature request below we see that the geometry is indeed a LineString with dimension=3

The following is a test WFS GetFeature request response showing srsDimension="3" and the correct coordinates in the list.

<?xml version="1.0" encoding="UTF-8"?>
<wfs:FeatureCollection xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:test="https://augview.net/test" xmlns:wfs="...">
</wfs:FeatureCollection>
<wfs:member>
<test:Conduit gml:id="Conduit.2">
<test:Id>2</test:Id>
<test:Diameter>100</test:Diameter>
<test:nominal_depth>0.7</test:nominal_depth>
<test:geom>
<gml:LineString srsName="urn:ogc:def:crs:EPSG::7856" srsDimension="3" gml:id="Conduit.2.geom">
<gml:posList>545065 6891857 1 545075 6891857 1.2 545079 6891865 1 545095 6891827 1.2</gml:posList>
</gml:LineString>
</test:geom>
</test:Conduit>
</wfs:member>
</wfs:FeatureCollection>

So I believe that GeoServer is publishing the data correctly but that when adding the layer to QGIS it is dropping the z values (although correctly interpreting the sequence of values).

Any & all help gratefully accepted

regards

Mike