[postgis-users] Intersection problems with complex polygons
neumann at karto.baug.ethz.ch
Thu Jan 6 03:47:26 PST 2005
I regularly run into intersection problems when using intersection
between a rectangle (defined as a POLYGON) and a very complex polygon
After intersection I expect to get back a MULTIPOLYGON, however, it
results in a GEOMETRYCOLLECTION not only containing POLYGON or
MULTIPOLYGON elements, but also LINESTRINGs.
I can't understand why? is there a limit in complexity or a bug in the
To reproduce my problem I have a SQL query online, containing the two
geometries: http://www.carto.net/neumann/temp/intersection_test.sql.gz -
the first geometry is fairly complex, but a realworld example from the
Yosemite National Park.
I am using the latest GEOS library (2.1.1) and the latest postgis
Any hints would be welcome.
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