[postgis-users] TIN from point coverage

Pierre Racine Pierre.Racine at sbf.ulaval.ca
Thu Mar 24 14:52:36 PDT 2011

My goal is to define the way leading from a point coverage to a raster. Something like ST_Interpolate("pointgeomtable", "rastercolumn") -> raster. What would be the step leading to that?

I guess we have everything now to store a Delaunay Triangulation as polyhedral surfaces right?

Then from this polyhedral surface we can derive a raster...

Maybe a first ST_AsDelaunayTriangulation(geom) could be an aggregate SET function returning a set of triangle...

and maybe ST_Interpolate(polyhedral surfaces) could be an aggregate function that would aggregate those triangle into a raster?

What do you think?

>-----Original Message-----
>From: postgis-users-bounces at postgis.refractions.net [mailto:postgis-users-
>bounces at postgis.refractions.net] On Behalf Of Olivier Courtin
>Sent: 24 mars 2011 17:25
>To: PostGIS Users Discussion
>Subject: Re: [postgis-users] TIN from point coverage
>On Mar 24, 2011, at 9:33 PM, Pierre Racine wrote:
>Hi Pierre,
>> Is there a way now to produce a TIN (or Polyhedral surface I guess)
>> from a table of point geometry?
>Nope, as the (initial) use case for TIN is not coverage, but rather
>City Model
>(so small precomputed volumes)
>If we want such a thing we have to be able to triangulate the point
>and to split the resulted TIN in several small subpart.
>postgis-users mailing list
>postgis-users at postgis.refractions.net

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