[GRASS-user] unable to reproduce r.water.outlet example of GRASS book

Moritz Lennert mlennert at club.worldonline.be
Tue Sep 6 12:50:23 EDT 2011


I'm trying to reproduce an exercise of the GRASS book, third edition, 
pp. 145-146, which demonstrates the usage of r.water.outlet. Using 
exactly the same commands as listed in the book, I get a basin which is 
hardly visible unless zooming very closely to it. r.report reports a 
size of 0.0002 ha. Is this normal ?

The relevant commands in the book are (for the NC dataset):

g.region rural_1m -p (or g.region rast=elev_lid792_1m)
r.watershed elev_lid792_1m thresh=5000 accum=accum_5K \
             drain=draindir_5K basin=basin_5K
r.water.outlet drainage=draindir_5K basin=basin_A30 \
                east=638872.6 north=220042.6

Can anybody else reproduce this ?

If yes, could changes in r.watershed have had an influence on these 
results ?


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