I would like to add my wholehearted support to Greg Koerper's call for floating point and null values in GRASS. Tom Hobbs N. T. Hobbs phone: 303-484-2836 ext360 Mammals Research Section fax: 303-490-2621 Colorado Division of Wildlife email: nthobbs at ariel.dowfc.colostate.edu 317 W. Prospect Fort Collins CO 80526