How about ST_Boundary? http://postgis.refractions.net/documentation/manual-svn/ST_Boundary.html
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Travis Kirstine Sent: Friday, November 21, 2008 10:18 AM To: PostGIS Users Discussion Subject: [postgis-users] return boundary I have a multipolygon that has consists mainland and island polygons. I need to generate a single polygon / line that represent the boundary of the multipolygon as a whole, something like a convex hull but keeping the detail of the outer rings and joining the islands to the mainland. I have been try different combos of convex hull, buffer and difference but can't get what I'm looking for. Any thoughts would be greatly appreciated Regards -- Travis K. Toronto, Canada ------------------------------------------------------------ "She knows there's no success like failure And that failure's no success at all." -Bob Dylan- ------------------------------------------------------------ _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users ----------------------------------------- The substance of this message, including any attachments, may be confidential, legally privileged and/or exempt from disclosure pursuant to Massachusetts law. It is intended solely for the addressee. If you received this in error, please contact the sender and delete the material from any computer. _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
