[postgis-users] Simplify borders
aperi2007 at gmail.com
Thu Dec 9 23:33:18 PST 2010
>I'm sure this is a common problem, but I haven't been able to figure out how to do it in PostGIS.
>I want to simplify a representation of borders. Specifically, we have divided an area into "zones", and
>we currently have a polygon* for each zone. The zones cover 100% of the "region", i.e. they divide the "region."
>The whole region is divided into zones.
>The polygons are stored independently, as a polygon geometry. My first question is how to ensure the border
>of one polygon matches the border of the adjacent polygon? That is, there should be no overlap
>or underlap (slivers). I think there's a system with buffering (to remove underlap a.k.a. slivers) and
>then ST_Intersection (to remove overlap). But I'm not sure of the right sequence or if there's a better system.
>Isn't there a geometry class (or something) that stores the border once instead of for each polygon separately?
I think you are speaking of the topology.
There is available a topology extension for postgis in the svn.
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