[postgis-users] How to Subtract Polygon From Polygon

Jan Saalbach fire at dubmosphere.de
Tue Nov 2 05:48:32 PDT 2010

Dear All,
is there a function to easily subtract a polygon from a polygon. Both 
are rectangles.

The scenario:
Two overlapping polygons identified by ST_INTERSECTS.
Creating a third one from the overlapping area via ST_INTERSECTION.
Subtract the overlap from the two initial polygons. Which function?

Any suggestions?


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