[postgis-users] Intersection Problem

[Frank Koormann]

Hi,

* Christian Niemitz-Rossant <cnr at m-click.de> [080122 22:33]:
> we are dealing with a similar problem "The intersection of a 3D line and a 
> 2D polygon returns a 3D line with some problems":
>
> So far we got these results:
> 1. Points of the line inside the polygon (Z-projection) have the correct 
> z-value which is simply unmodified.
> 2. The calculated intersection points of the line with the polygon have a 
> z-value which is half of the expected result.
> 3. If the calculated intersection point has the same xy-coordinates as one 
> point of the polygon then returned z-value is zero!
>
> We would appreciate hints, ideas or answers. Thanks!

Could you provide more information, e.g. the GEOS version you use and a
simple example showing the problem?

Regards,

        Frank

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