On 18 August 2010 21:05, salas <[email protected]> wrote: > Hi, i have the parcels table , and select various polygon > > ¿ how i can obtain the boundary of this group? > > best regards, salas >
Hi, Or using the st_extent aggregate function (http://postgis.refractions.net/docs/reference.html), eventually with the group by operator to isolate sets of polygons. Performing a union on the geometries to extract the bouding box may take a lot of time. Nicolas _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
