Are there any gdal/geos based utility out there that do a topological union between two sets of geometry (shape files)?
A topological union results in existing geometry being split into multiple pieces and each new resulting polygon having all of the attributes of both source polygongs. For example in a Venn diagram, 2 overlapping circles would result in 3 polygons. A non-topological union results in all geometry being in the same set, but w/o any new areas being created where there is overlap. For example, in a Venn diagram, even though two circles are overlapping, the overlapped portion would not result in a new polygon; there would only be the two original circles as polygons. Thanks for the help, Craig
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