Hey there

i was wondering how 3D referencing systems will be handled in the future in 
PostGIS? When 3D-Datatypes, -Indexes, -Functions are introduced to the 
PostGIS-World why are no 3D-srids delivered in the spatial_ref_sys by default? 

I know that there are insert-stmts out there (spatialreference.org), but it 
seems to me, as there hasn't been much of a discussion around it yet, nobody 
knows what to do with it. I myself don't know much about 3d-crs. I could 
imagine they are more precise etc.

The reason I'm asking is because I have recently ported a CityGML-Database with 
Import/Export-tool from Oracle to PostGIS (in the context of my Master Thesis), 
and on the oracle-side, the use of 3D-datatypes and 3D-indexes is restricted to 
3d-srids. A bit of a pain but it also makes sense to me. So back to my first 
question: What is the PostGIS-team (or other users) thinking about the 
implementation and usage of 3D-crs?

Cheers

Felix

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