Uwe, It wouldn't be easy to tell what your problem is without seeing your dataset. If you don't want to share your dataset, maybe create a small subset of it so others can try it.
Regards, Huidae On Fri, Feb 10, 2017 at 11:44 AM, Uwe Fischer <[email protected]> wrote: > Hello list, > > > > I have a question about dealing with duplicate polygons (dp) coming into > GRASS from a polygon shapefile. The polygons are not overlapping or having > gaps, but there are a number of real duplicate ones (polygons show parcels > with owners, and if one parcel has two or more owners, e. g. wife and > husband, this situation in the shapefile is represented by two identical > polys with two database rows that only differ in the owners name). > > > > My goal is to get rid of duplicates, having a result with only one > polygon/centroid at a given location with only one owner name. The name > does not matter, it can be chosen arbitrary by the system. This works fine > when using ESRI "clean"-command. The structure of the database table is > maintained while one (or many) of the dp is/are lost, leaving only one > valid polygon. > > > > Now, I found an older thread called "unable to get rid of duplicate > polygons". Obviously, the problem/question is the same but I could not find > a solution for GRASS there. So I tried: > > > > v.clean -c input=input@mapset output=output_clean tool=snap,rmdac,bpol > threshold=0.01,0,0 > > > > and > > > > v.clean -c input=input@mapset output=output_clean > tool=break,snap,rmdupl,rmdac,bpol > > > > Nothing did work. I get a map with tree layers, one showing the islands > only (layer 0), one showing the complete polygon set with duplicates (1), > and one showing only the duplicates (2). I also tried to delete layer 2, > assuming that this might remove the dp, but it only messed up the dataset. > > > > What am I doing wrong? > > > > Regards, Uwe > > > > _______________________________________________ > grass-user mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/grass-user >
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