Thanks for the help Chuck.
It would seem that the 'aspect' map of 'r.watershed' is in the right
format for 'r.water.outlet' - well the basin it derived certainly looks
right, especially when compared to our hand drawn ones - in fact the test
run highlighted some errors in our comparison catchment 8-(
I see what you mean by the only selecting a small 'catchment' - not too
sure that our digital rivers and DEM have been registered with each other.
Cheers,
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)