[postgis-users] intersect operation in 3d?

Ralf Suhr Ralf.Suhr at itc-halle.de
Mon Jul 19 01:51:52 PDT 2010

Hi Hugh,

all functions in PostGIS will work on 2.5D data. So you have to add an extra 
condition for your z-range.


Am Freitag 16 Juli 2010, 23:32:03 schrieb Hugh Stimson:
> Hi PostGIS folks,
> I'm trying to find a way to read two 3-dimensional polygons and test if
> they intersect. It's for a radar-bird-tracking application. I'm hoping
> that PostGIS is a solution.
> I've been scanning the Mailing list archives, and I gather that at least
> some of the spatial operations which PostGIS provides are 3d-enabled.
> Which surprises me, as my understanding was that PostGIS spatial
> operations descend from the Java Topological Suite via GEOS, and JTS
> advertises itself as being specifically for 2-d linear modelling.
> Could I count on the ST_Intersects function to work with 3d data? Would
> there likely be any special considerations for 3d?
> http://postgis.refractions.net/documentation/manual-1.5/ST_Intersects.html
> cheers,
> Hugh

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