On 1/24/2013 11:13 AM, Jan Hartmann wrote:
Does anyone know a trick to do this:
I'm making geographical indexes for the map series in our map library.
Each map sheets is displayed as a polygonal linestring, based on its
corner coordinates. Lots of sheets have exactly the same boundaries, so
it's not clear where a polygon indicates just one map sheet of several.
It's easy, of course, to write a PostGIS query to return a different
color code when map boundaries exactly coincide, but I was wondering
whether something like that could be done by mapserver on its own, like
XOR-ing a line with what is already there. Any ideas?
Hi Jan,
For polygons you could use a small negative buffer to shrink the polygon
slightly. You can do this in postgis, and you might be able to do it
with mapserver if geos is compiled in. See:
http://mapserver.org/development/rfc/ms-rfc-48.html
Steve W
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