Hi, I am trying to punch holes into a polygon - can someone tell me how to achieve this?
I have a large database of polygon geometries. I am now trying to "invert" these polygons area to receive a big polygon, that covers everything that is *not* covered in my existing polygons. The result should be a polygon covering the whole world but with holes in the areas which are already covered by my source polygons. I successfully created a "positive" using geomunion() on all my geoms. Now I need to invert the result to get a "negative". Hope I got the idea across... Thanks for any advice, Kevin _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
