Thanks Regina & Fred. That did the trick all right!
Regards On Thu, Aug 7, 2008 at 3:46 PM, Fred Lehodey <[EMAIL PROTECTED]> wrote: > 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 >> >> > > _______________________________________________ > postgis-users mailing list > [email protected] > http://postgis.refractions.net/mailman/listinfo/postgis-users > >
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