A question was posted asking for a method for generating contours from
rasters, this will be solved with the release of 4.1. There is a program
called r.contour included in the beta release. Hope you can wait until
then.
Good Luck!
Susan Stitt
National Park Service
Geographic Information Systems Division
PO Box 25287 12795 W. Alameda Parkway
Denver Colorado 80225-0287 Lakewood Colorado 80228
(303) 969-2596
susan%nps@cerl.cecer.army.mil