TopologyExceptions are thrown when the topological graph GEOS uses to compute relationships enters an invalid or impossible state. There are two reasons for TopologyExceptions to be thrown:
- GEOS is handling a valid geometry case incorrectly. That is, a bug.
- GEOS is handling an invalid geometry case correctly.
Before submitting a bug ticket based on TopologyExceptions, ensure your geometries are valid, by running the IsValid method on them. In PostGIS, the ST_IsValid() function calls the appropriate GEOS test. If your geometries are invalid, the problem is with your geometry, not with GEOS.
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Last modified on Dec 12, 2007, 10:00:47 AM
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