[GRASS-user] RE : RE : Merge polygone with same attribut of a shapefile

[Vincent Bain]

Le jeudi 16 mai 2013 à 23:38 +0300, Nikos Alexandris a écrit :
> Funny, I am "stuck" as on how to (re-)define in layer 2 the "cat"
> column with 
> unique categories for each (internal) feature id.  There is nothing
> that 
> helps-out towards this (simple?) task in the manuals (v.to.db). 

this should do the job:
v.category op=add layer=2 type=centroid
then
v.to.db type=centroid option=cat

VB