[..] Markus M: > > >> I assume the global mangroves map should not have overlapping > > >> polygons, therefore as long as there are overlapping areas and/or the > > >> number of centroids is not equal to the number of input polygons, more > > >> cleaning is needed.
Nikos A: > > > Unfortunately it seems there are overlapping polygons. Markus M: > > Obviously so, and fairly large overlapping areas according to your > > output even for snap=1e-6: Overlapping area: 5.32085E+09 (41538 areas) > > Therefore there are probably logical errors in the input data, for > > example the same mangrove polygon might be present more than once. > > This can not be cleaned automatically with v.in.ogr or v.clean. You > > can investigate overlapping areas in the imported vector with d.vect > > type=area layer=2 (only overlapping areas have a category in layer 2). Nikos A: > It looks _not_ good at all. Layer 2 over layer 1 uploaded at: > <http://picpaste.com/global_mangroves_usgs_2011_imported_snap_1e-6_layer2_ov > er_layer1-EWItDQK6.png>. Sorry, more details: # drawn in G7 d.vect global_mangroves_usgs_2011_06 layer=1 fcolor=red color=red d.vect global_mangroves_usgs_2011_06 layer=2 fcolor=blue color=blue [..] Nikos _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
