On Mon, Jul 27, 2015 at 9:41 AM, Ing. Pierluigi De Rosa <pierluigi.der...@gfosservices.it> wrote: > Dear All, > > I have shapefile with many topology errors. Most of there are > overlapping area. > When I'm import in GRASS It create, for all overlapped areas a link in > layer 2 and in layer 1 it create two category for each centroid.
You mean something like this: http://grasswiki.osgeo.org/wiki/Vector_topology_cleaning#Polygon_import_from_SHAPE_file > It is possible extract only areas where each centroid are linked to only > one category or extract only areas where no link to layer 2 exist? I see http://grasswiki.osgeo.org/wiki/Vector_Database_Management#The_concept_of_categories http://grass.osgeo.org/grass70/manuals/v.in.ogr.html#overlapping-polygons and darkly remember that this has been discussed but cannot find it. Perhaps use v.category with option=sum and then v.to.db to transfer it to the attribute table for filtering? Please let us know if that works for you (and how). Could be added to the Wiki then. best Markus _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user