Hi again, I'm trying to ST_Union multipolygons from the Zillow neighborhood data. When I do this I occasionally see:
NOTICE: TopologyException: found non-noded intersection between -73.812.... This appears to be due to invalid geometries, as the following query returns over a hundred rows: select * from neighborhoods where not ST_IsValid(the_geom) Can anyone suggest a workaround here? The resulting geometry needs to be a multipolygon. Also, what is ST_Is_valid actually testing for? The documentation isn't very explicity about the definition of validity. Thanks, David _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
