[postgis-users] Trying to figure out topology

[Dylan Beaudette]

wouldn't a simple implementation be found in the GRASS vector library?

dylan

On Tuesday 05 June 2007 14:36, Paul Ramsey wrote:
> No, it's not that far along. There is a model and some support
> functions, but the "big money" is in building a topology from non-
> topological data, and that is not there yet.
>
> P
>
> On 5-Jun-07, at 1:40 PM, William Kyngesburye wrote:
> > On Jun 5, 2007, at 12:38 PM, William Kyngesburye wrote:
> >> Now I get to generating topology for each line in the layer.  The
> >> wiki has:
> >>
> >> select topology.CreateTopoGeom(topology_name, feature_type,
> >> layer_id [as returned from AddTopoGeometryColumn], TopoElementArray);
> >>
> >> but the link to TopoElementArray doesn't really tell me where to
> >> get those element type/element id pairs for the array.  Would
> >> those be the geom types and feature IDs of the layer?  Would I use
> >> a SQL select to pipe in all the rows of the layer?  Examples would
> >> be much appreciated.
> >
> > After poking around in the topology tests in the postgis source,
> > I'm wondering if there are topology *building* functions yet.  It
> > seems to handle only *adding* topology from existing data that has
> > topology, like importing from an ArcGIS coverage.
> >
> > I guess development is not as far along as I hoped.
> >
> > -----
> > William Kyngesburye <kyngchaos*at*kyngchaos*dot*com>
> > http://www.kyngchaos.com/
> >
> > Earth: "Mostly harmless"
> >
> > - revised entry in the HitchHiker's Guide to the Galaxy
> >
> >
> > _______________________________________________
> > postgis-users mailing list
> > postgis-users at postgis.refractions.net
> > http://postgis.refractions.net/mailman/listinfo/postgis-users
>
> _______________________________________________
> postgis-users mailing list
> postgis-users at postgis.refractions.net
> http://postgis.refractions.net/mailman/listinfo/postgis-users

-- 
Dylan Beaudette
Soils and Biogeochemistry Graduate Group
University of California at Davis
530.754.7341