Rather than geometry processing, work on your rendering engine. You can usually achieve an interior band (the classic National Geographic political boundary, yes?) with a half-brush (rather than a full circle, use a half-circle), and just ensuring your polygons are consistently oriented.
P. On Tue, Feb 28, 2012 at 10:04 AM, Robert Buckley <robertdbuck...@yahoo.com> wrote: > Hi, > > I am trying to create an inner buffer of a polygon geometry table. > Unfortunately this is the only way I can think of which will enable me to > make a certain symbol for a polyon layer. The SLD Filter "difference" might > do it, but it needs to be nested and i´m not sure if this is possible. > > anyway....My polygons need to be symbolized with a thin outline AND an > inside Buffer of 3 mm(150m at a scale of 1:50 000)....in essence just an > inside ring. > > This means I need to first buffer my polygon geometry and then substract the > buffer from the original polygon. = ST_Difference (i think!?!) > > my attempt created some geometries but not what I was expecting... > > create view rrop08.rrop_01_13_innerbuffer AS > > SELECT ST_Difference(a.st_buffer, b.the_geom) > > FROM rrop08.rrop_01_13_buffer a, rrop08.rrop_01_f b; > > > rrop08.rrop_01_f = the original polyon > > rrop08.rrop_01_13_buffer = the inner buffer > > > > > > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users > _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
