[postgis-users] 3D support in PostGIS

[Ben Jubb]

1. yes
2. indexes are 2D only, Z is ignored.
3. your example would be true. Z is ignored.


Olivier Tournaire wrote:
> Hi all,
>
> I a currently studying 3D GIS and I have a few questions about 
> PostGIS. I can find any recent or full answer on the web, so, I try 
> the mailing list.
>
> 1. As far as I know, PostGIS is ale to store 3D data. Am I right ?
> 2. If I create a spatial index on a table which contains 3D 
> geometries, is it a real 3D index, or the objects are projected onto 
> the ground and the the index is built with this projection ?
> 3. Last, but not least, is it possible to have operations on 
> geometries in a 3D framework. For example, it I test if the point 
> (0,0,50) is within the polygon ( (-10,-10,0) (-10,10,0) (10,10,0) 
> (10,-10,0) ), what is the answer ? In other words, is the result 
> obtained with taking into account the Z coordinate or not ?
>
> Best regards,
>
> Olivier
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