[postgis-users] Extract boundary from multipoint

[Nicklas Avén]

Hallo

What is not working?

ST_ConvexHull only calculates in 2D but since it passes the z-values to
the result it should work if your plane is coplanar and not vertical.

If it is a vertical plane only one point per 2d point will be
considered.

But as long as each point has its own representaion in 2D xy plane it
should work as I understand it.


/Nicklas



On Tue, 2011-06-07 at 12:25 +0200, sdellyta at hsr.ch wrote:
> Hi,
> 
> I would like to ask a question :
> I have set of point clouds and managed to do the segmentation. From the segmentation I have set of points that define a plane. Anyone know how to get the boundary of the plane?
> It seems that convex hull does not really work in my case.
> 
> Thanks.
> sdellyta
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