[postgis-users] 3D support in PostGIS

[Paul Ramsey]

On Jan 28, 2008, at 9:35 AM, Olivier Tournaire wrote:

> Thanks Paul and Ben for your answers.
>
>> Z-values are ignored in tests, and occasionally used in building  
>> resultants for things like intersections.
>
> Is it possible to know which "things" ?

Intersection.  I intersect two lines that have Z components, what is  
the Z component of the resultant point?

> Does PostGIS uses GEOS for spatial computations ?

Yes

> GEOS does not support 3D operations ?

No, except for the exception above.

P