Hi App-Schema experts,
I've yet another issue. I'm trying to map a PostGIS column
which contains a POLYGON geometry:
polygon GEOMETRY NOT NULL
to a gml:Surface. The relevant part of the schema is:
<element name="mySurface" type="gml:SurfacePropertyType"/>
I'm expecting the following output:
<myns:MyFeature gml:id="...">
<myns:mySurface>
<gml:Surface gml:id="..."
srsName="http://www.opengis.net/gml/srs/epsg.xml#4326";>
<gml:patches>
<gml:PolygonPatch>
<gml:exterior>
<gml:LinearRing>
<gml:posList>11.5 23.4 12.2 13.43 ...</gml:posList>
</gml:LinearRing>
</gml:exterior>
</gml:PolygonPatch>
</gml:patches>
</gml:Surface>
</myns:mySurface>
</myns:MyFeature>
This is my mapping:
<AttributeMapping>
<targetAttribute>myns:mySurface</targetAttribute>
<sourceExpression>
<OCQL>polygon</OCQL>
</sourceExpression>
</AttributeMapping>
However, I get an error message stating that GeoServer can't perform the
following conversion:
gml:Polygon -> gml:Surface
So I tried to work around this limitation by using an own surface type
like this:
<complexType name="MySurfaceType">
<sequence>
<element ref="gml:patches"/>
</sequence>
</complexType>
Then I used the following mapping:
<AttributeMapping>
<targetAttribute>myns:mySurface/myns:MySurface/gml:patches</targetAttribute>
<targetAttributeNode>gml:SurfacePatchArrayPropertyType</targetAttributeNode>
<sourceExpression>
<OCQL>polygon</OCQL>
</sourceExpression>
</AttributeMapping>
But I got another error message that GeoServer also can't perform this
conversion:
gml:Polygon -> gml:PolygonPatch
This sounds very strange, because both conversions are almost trivial:
gml:Polygon -> gml:PolygonPatch
gml:Polygon -> gml:Surface
Is there a way to perform that conversion in GeoServer, or do I have to
wait until PostGIS has native support for the POLYHEDRALSURFACE type?
Also, would GeoServer then be able to perform that conversion automatically,
or is there no way but to store the geometry as a POLYHEDRALSURFACE in the
first place?
Greets,
Volker
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