After repeated queries about how to make a raster mask, I created a script several months back that simplifies this operation. It works pretty much like r.mask for GRASS 5, and so I named it r.mask (for GRASS 6).
Although it’s been in the cvs for quite a while (and is even in the menu), I just realized yesterday that it was not compiled by default and so is not appearing in most binaries. I just changed this so that it is automatically compiled now.
Michael
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics and Complexity
Arizona State University
phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton