[postgis-users] Cross sectional slice of 3d features

[strk at refractions.net]

David, I suggest you get a CVS snapshot of postgis and get
used with the new API. I'll be happy to help.
--strk;

On Wed, Oct 06, 2004 at 12:51:10PM -0500, David Bitner wrote:
> Does anyone know how best to go about creating some functions to work with
> creating a cross-sectional slice of a 3d feature set.  I have a set of 3d
> lines that I would like to draw an intersecting line over.  Using
> Intersection() I can get the geometry of the points where the lines
> intersect. What I would like is a result geometry with the Y-coord as the
> elevation of the points of intersection and the X-coord as the distance
> along the line where the intersection was (to make a penetration diagram).
> I would also like to be able to get the average z value of the intersection
> set.  As always, any help is greatly appreciated.
> 
> David
> 
> 
> 
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