[gdal-dev] Topological Union?

[Mateusz Loskot]

Craig Miller wrote:
> Are there any gdal/geos based utility out there that do a topological union
> between two sets of geometry (shape files)?

AFAIR, GEOSUnion is a topological union

// C API
g3 = GEOSUnion(g1, g2);

GEOS does not provide any Shapefile I/O features, but you can use OGR 
[1] to read Shapefile and access geomtry objects.

[1] http://www.gdal.org/ogr/

Best regards,
-- 
Mateusz Loskot, http://mateusz.loskot.net
Charter Member of OSGeo, http://osgeo.org