That seems like it would make a big performance difference in this case. Stephen Mather Geographic Information Systems (GIS) Manager (216) 635-3243 s...@clevelandmetroparks.com clevelandmetroparks.com
-----Original Message----- From: Sandro Santilli [mailto:sandro.santi...@gmail.com] On Behalf Of 'Sandro Santilli' Sent: Tuesday, April 17, 2012 4:50 AM To: Stephen V. Mather Cc: 'PostGIS Users Discussion' Subject: Re: [postgis-users] ST_MakeValid On Mon, Apr 16, 2012 at 03:05:21PM -0400, Stephen V. Mather wrote: > > IIRC there's a difference with a multipolygon composed by two > > overlapping rectangles. > > Rereading, does ST_MakeValid also test for overlapping polygons? It handles those too, yes. Basically it nodes and polygonizes all boundaries of input polygons and then maximizes the vertices retained in output by toggling between interior and exterior at every boundary. When impossible, the line is retained as a linestring. --strk; ,------o-. | __/ | Delivering high quality PostGIS 2.0 ! | / 2.0 | http://strk.keybit.net - http://vizzuality.com `-o------' _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
