Hi Erik, you can try something like that: (?) select st_difference(ST_envelope(the_geom),the_geom) from mytable
Fred On Thu, Aug 7, 2008 at 2:11 PM, erik <[EMAIL PROTECTED]> wrote: > Hello, > > I don't know if the terminology I use is correct but I would like to create > a mask of layer I have. > For example, from the shape of the world I would like to keep only the > oceans, the negative of the initial shape. > I haven't found any info or documentation about this. Can this be done in > PostGIS? > > Many thanks! > > Erik > > _______________________________________________ > postgis-users mailing list > [email protected] > http://postgis.refractions.net/mailman/listinfo/postgis-users > >
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