Isn't a Union supposed to merge all polygons in one? The only thing I get to do this in ArcView is the "Merge" and that's also the functionality I get from ST_Union.
Btw, for ST_Union'ing many complex polygons I'm using CascadedUnion as written here: http://postgis.refractions.net/pipermail/postgis-users/2007-December/017995.html. On Mon, Aug 18, 2008 at 4:12 PM, Bresnahan, Mike <[EMAIL PROTECTED] > wrote: > > How the hell do you get it to do a real union? > > Heh. Intuitive ArcMap is not. It took me forever to figure it out as well. > You can do a union a couple different ways. The way that seemed to work the > best for this is to: > > 1) Run ArcMap > 2) Add the shapefile to your map > 3) Open the edit toolbar. > 4) Click on Start Editing. > 5) Select the entire dataset by left clicking and then dragging a rectangle > around the geometry. > 6) Select Union from the menu on the edit toolbar. > > You should see the union happen right before your eyes. > > I think I tried the Union Tool like you did and didn't get what I expected. > I think it just did a union on each individual feature instead of doing an > aggregate union. > > > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users > >
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