On Fri, Aug 3, 2012 at 11:55 PM, Andrea Aime
<andrea.a...@geo-solutions.it>wrote:
> Take also into consideration the data sources, that has implication as
> well.
> In PostGIS you can declare a 2D CRS and then specify the number of
> dimensions
> is 3 or 4, that's perfectly fine with the database, and I guess we should
> be able to
> support 3D bboxes against that case too. How is that going to play if the
> plan
> is to only use the CRS to figure out the dimensions?
> Would having some information in the GeometryDescriptor user
> data section that provides the true dimension regardless of the chosen CRS
> work better in general?
>
This went a bit off the tangent, but here is the part that affects the
filtering code.
Say I have a layer in postgis that is declared as EPSG:4326 with dimension=3
(perfectly legit in postgis), how am I going to filter it using BBOX3D?
It seems whatever I do I might be in some issue from some point of view:
* if I state the crs is EPSG:4326 then the dimensionality check in
ReferencedEnvelope3D.checkCoordinateReferenceSystemDimension()
will make it impossible to build the filter
* as a user I could know that I have to use EPSG:4327 instead, but this
will make the CRS inconsistent with the one on the DBMS.. besides that,
I don't see an immediate way for automated code to build the "3d
equivalent"
of a 2d system, and the layer will be declared in the feature type as
having
EPSG:4326 (since that's what we reflect out of the database)
Cheers
Andrea
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