Ge, What do you mean by outline of all objects? You mean if you have a bunch of polygons you just want one record with all boundaries dissolved?
Maybe you are looking for ST_Union SELECT ST_Union(the_geom) FROM sometable That will dissolve boundaries. http://postgis.refractions.net/documentation/manual-svn/ST_Union.html or you mean you have a polygon and you want the linestring outline. For that use ST_Boundary(the_geom) or ST_ExteriorRing http://postgis.refractions.net/documentation/manual-svn/ST_Boundary.html http://postgis.refractions.net/documentation/manual-svn/ST_ExteriorRing.html Leo -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of G. van Es Sent: Thursday, August 13, 2009 2:48 PM To: PostGIS Users Discussion Subject: [postgis-users] how to create ouline of multiple objects Hi All, Maybe a stupid question but I have a shape imported in PG of wich I want to determine the outline of all objects. The result should be a LINE or just one POLYGON. Does anyone know if this is possible in PG. Thanks, Ge _______________________________________________ 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
