Steven Mullins wrote: > I have a large set of contoured data which has a z value in > an attribute field. I would like to copy this value to the > spatial z. I think this is going to require a bit of > python. Any pointers? this will do it: (hcolumn=) http://grass.osgeo.org/grass64/manuals/html64_user/v.extrude.html Hamish