I have a shapefile with overlapping polygons. After importing I thus end up with a vector layer with for each unique polygon (feature) one or more category values (i.e., one to many relationship).
Now I want to create a second attribute table linked to layer 2 with a cat column with for each polygon (for each internal feature id) an unique category. Next, I want to use this to count the number of categories linked to each unique feature id. I know this has been asked and answered before, but the solutions (copied below) do not work for me. This worked, I think, in GRASS 6, but it doesn't in G7 because a new vector map needs to be defined >* v.category op=add layer=2 type=centroid* >* v.to.db type=centroid option=cat* The below does not create an attribute table with unique attributes for each unique feature. *> v.in.ogr dsn=test_polygones.shp out=polygons > v.db.addtable polygons layer=2 > v.category polygons option=add layer=2 type=centroid out=polygons_tmp > v.to.db polygons_tmp type=centroid option=cat layer=2 col=cat*
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