Hi all, I am a little bit puzzled about the actual number of lines/categories of a specific vector map (river network). As discussed yesterday, the output of v.category with the report option provides a column 'count' which is a feature count. Running v.category option=report on my vector provides me following:
v.category input=Ebro_river_vector_poly_clean_tmp@Ebro2_alien_spread option=report Layer/table: 1/Ebro_river_vector_poly_clean_tmp type count min max point 0 0 0 line 804 1 1053 .... This would indicate that I have 804 line features. However, using the tool v.info on the same vector I get following different result regarding the number of lines: v.info map=Ebro_river_vector_poly_clean_tmp@Ebro2_alien_spread +----------------------------------------------------------------------------+ | Name: Ebro_river_vector_poly_clean_tmp | ... | Number of points: 0 Number of centroids: 0 | | Number of lines: 799 Number of boundaries: 0 | ... And even more puzzling, I then added a table to this vector map and the output of v.db.addtable is: v.db.addtable map=Ebro_river_vector_poly_clean_tmp@Ebro2_alien_spread Reading features... Updating database... 803 categories read from vector map (layer 1) 803 categories read from vector map don't exist in selection from table 803 records updated/inserted (layer 1) So, is it 804,799 or 803?? The map I am using is a polyline river network (cat=first) that has gone trough the tool v.clean with the options: break,rmdupl,rmline,rmsa,rmdangle. The number of lines and cats before the cleaning tool is 805 (consistent output among all tools). So I am wondering what happens during cleaning and how to get a clean map with a corresponding table that has entries for each cat, and were each cat represents one line feature (i.e. that the number of cats/line features is consistent over the multiple tools). Please let me know if I should share the vector map (and how, which format). Cheers, Johannes
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