Message title says it all, but seriously, I've been using
'r.water.outlet' for a few months now. You give it an aspect map (ours
are generated by 'r.watershed'), an easting & northing and it outputs a
raster map of the catchment (with category 1 in the catchment, category 0
outside).
I'm sure I got the source code from 'moon.cecer.army.mil /incoming' -
if not then I try and put it there, if that'll help.
Steve Culshaw
NRA North West
e-mail : nra@cix.compulink.co.uk (use this for general usage)
or sculshaw@cix.compulink.co.uk (Private - only checked at best
biweekly)