[GRASS-user] Flowaccumulation calculation with modified flowdirection

[Manuel Seeger]

Hello all,

I'm trying to implement anthopogenic structures like paths and forest roads 
into DEM to get modified flow directions.
One option is to modify the flowdirection grid by itself, but now, I dont know 
how to generat a new flow-accumulation model using the modified flowdirection 
grid.
all modules in GRASS use the DEM as input variable and I dont know how to 
force them to use my own flow-direction grid.

Some ideas?

Thank you!

Manuel

-- 
Dr. Manuel Seeger
Wiss. Assistent						Scientific Assistant
Physische Geographie					Dpt. of Physical Geography
FB VI - Geographie/Geowissenschaften		Geography/Geosciences
Universität Trier						University of Trier
D - 54286 Trier
Tel.:		+49-651-201 4557
Fax:		+49-651-201 3976
Web:	http://www.uni-trier.de/uni/fb6/geographie/mitarbeiter/Seeger/