On 22/11/12 16:59, Aldo Clerici wrote:
So, if I need to assign different attributes to the objects in the vector file I need to assign new categories to the objects and store them in a new layer to be connected to a different table. But how can I add a new layer to a vector? v.category seems to produce a new vector map with new category values but doesn't add a new layer in the input map.
Sure it does. v.category op=add layer=2 ... will create a new map with the old category values preserved in layer 1 and with new category values in layer 2. And as mentioned in a previous mail, in GRASS7 you can simply copy the category values of layer 1 to layer 2 with op=transfer.
But I suppose there is another simpler way to add and fill a new layer as, for example, to reclass the category numbers of a map and put the reclassed categories in a new layer to be connected to a new table with new attributes. Or not?
AFAIK, v.reclass does not allow you to chose the layer of categories in the new map, only which layer to use in the old map.
Moritz _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
