where
Elevation map need not to be rectangular if study basin was already determined. Non-interesting region may have NULL values. Study basin map can be taken from r.water.outlet then the following r.mapcalc statements will create study basin extracted elevation map.
r.stats -Anc prints out averaged statistics for topographic index.
GRASS port by Huidae Cho
Hydro Laboratory, Kyungpook National University, South Korea
Last changed: $Date: 2005/03/01 06:58:58 $