You may want to investigate the ST_Intersection functionality in PostGIS. This
allows you to create a new geometry from the intersection of the EEA regions
and the countries.
http://postgis.refractions.net/docs/ST_Intersection.html
Regards,
Edward
Date: Thu, 7 Jul 2011 11:44:29 +0200
From: jci...@ulb.ac.be
To: mapserver-users@lists.osgeo.org
Subject: [mapserver-users] merging shapefiles
Hello,
I have an (OpenLayers) map with two layers:
- Country (as a base layer)
- EEA
You can see the output here:
http://home.bebif.be/~jcigar/map.jpg
The Country layer contains just the borders of the countries, and the
EEA layer (the colorized areas) contains environmental areas.
What I'd like to do is to select a polygon within a country for a
specific zone. For example I would like to select part of Belgium with
the Atlantic EEA (in blue), which is the north of Belgium. I also need
to save some information in the database for the polygon (I'm using
Mapserver/PostGIS).
What would be the best way to do this? Would you merge the two layers
into one (be creating new polygons)?
thanks,
Julien
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