[postgis-devel] #1898: ST_DelaunayTriangles option to output as TIN

[pcreso at pcreso.com]

Note that there is nothing stopping users loading the tin polygons (triangles) into a topology.

Brent Wood

From: Sandro Santilli <strk at keybit.net>
Subject: Re: [postgis-devel] #1898: ST_DelaunayTriangles option to output as TIN
To: "PostGIS Development Discussion" <postgis-devel at postgis.refractions.net>
Date: Saturday, September 15, 2012, 2:15 AM

On Fri, Sep 14, 2012 at 03:32:09PM +0200, Tom van Tilburg wrote:
> On 14-9-2012 11:52, Sandro Santilli wrote:
> >
> >>Is there any prospects on the making of this?
> >Interested in helping or co-funding ?
> I'm afraid only on the level of testing/documenting, I'm lacking the
> skills and budget.
> Is there already work done on the topic or is it waiting for funding?

I think the next step for it would be reviewing and improving the TIN
support in the underlying lwgeom library. All is known about it is in
the ticket: http://trac.osgeo.org/postgis/ticket/1898

> I know a topology need not be a TIN, but isn't a TIN describing a topology?

Theoretically, but the way it is stored in PostGIS full topological
definition (is just a bunch of polygons, tagged as a TIN). 

> Could a poor man's TIN be a topology with some strict rules on the
> number of points?

There's no such data structure in postgis (C level) representing a topology.

--strk;

 http://www.cartodb.com - Map, analyze and build applications with your data

                                       ~~ http://strk.keybit.net 

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