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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