wiki:TopologyExceptions

Version 1 (modified by pramsey, 11 years ago) (diff)

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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 a TopologyException?, 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.