On Mon, Jun 25, 2012 at 09:15:21AM -0700, Bob and Deb wrote: > People should be cautioned that some polygons might disappear when using a > buffer of 0. Does Postgis 2.0 have this problem with makevalid? No, ST_MakeValid retains all vertices. --strk; Sent from our free software http://www.gnu.org/philosophy/free-sw.html