[postgis-users] 3D support in PostGIS

[Bruce Rindahl]

I believe the affine() functions support 3D if the z parameters are
included.
Bruce Rindahl

-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of Paul
Ramsey
Sent: Monday, January 28, 2008 11:12 AM
To: PostGIS Users Discussion
Subject: Re: [postgis-users] 3D support in PostGIS


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

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