>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?
Hi, I think you are speaking of the topology. There is available a topology extension for postgis in the svn. -- ----------------- Andrea Peri . . . . . . . . . qwerty àèìòù -----------------
_______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
