Dear list, I am managing a bulk cleaning of pseudo-network data, where nodes "more o less" overlap links, but never break links itself (usually links have no vertex near those nodes)
I am using v.distance between pseudo-nodes and links, followed by parsing db.select output and then piping it to v.edit, tool=break when trying to update links length, I realized something was wrong because of identical CATs of links just edited rebuilding theme was useless, because this way I lost attributes on new elements, while I need to inherit all of them, except for length same problem adding new cat on a different layer (this way I get a unique cat field, but I lost all attributes ) to update my length field I do really need a UNIQUE_value CAT, but I found no other way to get a UNIQUE value CATÂ than brutally exporting theme in shp and reloading it using v.in.ogr this post [1] suggest a similar issue on v.split reading this paper [2] about v.edit, break and split seem different tools (different record management?) on the other hand, grass manuals of v.edit (6.4, 7.0) tell "break: Break/split vector lines" like synonyms is there a better/smarter way to solve this problem? perhaps (but really complex): 1. parsing ids from v.edit where cat = old cat, 2. get last category in use 3. modify one item setting cat = last category +1, 4. insert new record on attribute table copying data where cat = old category and setting cat = last category +1 5. re-connect data or I am missing something about grass vector editing and categories management? thank you Enrico [1] http://www.mail-archive.com/[email protected]/msg01509.html [2] http://gislab.dirap.unipa.it/grass_meeting/articoli/grass-digit.pdf _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
