[GRASS-user] accumulation map from directions map

[Markus Neteler]

2009/11/19 Achim Kisseler <ak7 at jupiter.uni-freiburg.de>:
> Thanks, Jaroslaw for response,
>
>> there shoud be no problem if you have oryginal DEM
> I know, but I do NOT have the DEM. Thats the problem.


Ah, now I understand "is there a way in GRASS to build an
accumulation map from a directions map without a dem map?"

So: If you are on earth, you can get it here (mars/moon should be also
available somewhere :-):

http://grass.osgeo.org/wiki/Global_datasets
- SRTM
- ASTER GDEM

especially
http://grass.osgeo.org/wiki/ASTER_topography

If you need to start from the accumulation map and no way to
use a DEM, then I have no idea (but see the other comments)

Hope this helps,
Markus