[gdal-dev] Topological Union?

[Craig Miller]

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

 

 

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/gdal-dev/attachments/20080828/b0ed0268/attachment.html