Hi,
I'm playing with some 3d data with a compound CRS (EPSG:7415), built
coupling a 2D flat CRS with
a vertical one.
Trying to render it fails in streaming renderer, because it's not possible
to go from the 2D envelope
of a WMS request to a 3D one... here is what's going on:
1. The code receives a request to render a map, the bbox is obviously
expressed in a flat CRS (by WMS spec, in this case), say EPSG:4326
2. StreamingRenderer needs to filter on this bbox to get the data, sees
it does not match the native CRS and tries a transformation to setup the
filter
3. ReferencedEnvelope attempts a 2d to 3d transformation using
JTS.transformTo3D... which blows up because it's trying to pivot
though DefaultGeographicCRS WGS84_3D, but there is no transformation
between that and EPSG:7415
Now, leaving aside the notion of supporting vertical CRS transformations
(which we don't have good support for), the main issue here is that the
request wants to filter on a 2D area, so the reasonable approach would be
to transform the requested envelope to the 2D component of the 3D CRS, and
then set the z part of the query envelope to go from -INF to +INF (in other
terms, unspecified).
The current code, in the few cases where it works, goes from a 2D envelope
to a 3D one with Z that are zero, e.g., the
ReferencedEnvelopeTest.testTransformToWGS84 does the following one:
Source: ReferencedEnvelope[130.875825803896 : 130.898939990319,
-16.4491956225999 : -16.4338185791628]
Target: ReferencedEnvelope3D[130.875825803896 : 130.898939990319,
-16.4491956225999 : -16.4338185791628, 0.0 : 0.0]
Filtering wise this is not useful, if really applied it would only catch
objects that are intersecting the sea level...
Cheers
Andrea
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