On Thu, 28 Jun 2012, Alexander Muriy wrote: > GRASS don't work with 3D-topology. If your "drillholes" map is 3D, try to > make its 2D copy using <v.to.3d> module with the flag "-r" and then try to > select "drillholes" in "catchments". It's not 3d. Don't know why you thought it was. > Try module <v.distance> I'll look at that. Rich