Hi list,Trying to get 3D coordinates out of the GeoServer WFS. We're using GeoServer 2.1.3. What I've learned:
* Geographic 3D CRSes aren't supported yet because they can't be encoded in WKT. They can't be encoded in WKT because there's only one spot for a unit of measure in the syntax, whereas a Geographic 3D CRS can have two different units (e.g. degrees and meters).
* Because of this, EPSG:4979, the CRS used in the systems we interact with, isn't supported.
* GeoServer/GeoTools support EPSG:4327 (how?), but that appears to be in DMS instead of degrees.
* Using PostGIS, GeoServer can answer WFS 1.0 queries with 3D coordinates if EPSG:4327 is chosen.
* GeoServer encounters this error when trying to answer WFS 1.1 queries:java.lang.ClassCastException: org.geotools.referencing.operation.transform.ProjectiveTransform cannot be cast to org.opengis.referencing.operation.MathTransform2D at org.geotools.data.crs.ReprojectFeatureIterator.<init>(ReprojectFeatureIterator.java:80)
* ...but if you add srsname=EPSG:4327, GeoServer gives the following somewhat funny answer:
<gml:Point srsDimension="3" srsName="http://www.opengis.net/gml/srs/epsg.xml#4327";><gml:pos>0.0 0.0</gml:pos></gml:Point>
So my questions are: 1. What's the current state of 3D coordinate support?2. If it's supported, how do I do it correctly? If it's not there yet, is there any way I can hack it? I can provide patches if need be.
3. Is there a CRS with lat/lon in degrees and height above ellipsoid in meters that GeoServer supports out of the box?
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