So, Do you need to iterate through the sub-polygons in your multi and get a boundary of each?
r.b. Robert W. Burgholzer Surface Water Modeler Office of Water Supply and Planning Virginia Department of Environmental Quality [EMAIL PROTECTED] 804-698-4405 Open Source Modeling Tools: http://sourceforge.net/projects/npsource/ -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Travis Kirstine Sent: Friday, November 21, 2008 10:51 AM To: PostGIS Users Discussion Subject: Re: [postgis-users] return boundary Thanks Obe But I'm looking for something that returns the boundary of all the selected features combined and attached. Something that has the abilty to take the group the features together like convex hull but keep the detail of the of the edge like boundary. 2008/11/21 Obe, Regina <[EMAIL PROTECTED]>: > 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 > [email protected] > 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 > [email protected] > http://postgis.refractions.net/mailman/listinfo/postgis-users > -- 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 [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
