[GRASS-user] r.watershed

[Alex Schulze]

Hi,

I got an similar error message like Wes Kent (Janurary 2008). 

http://img361.imageshack.us/my.php?image=rwatershedvl0.jpg

I use the SRTM-Data (90m) and merge with r.patch 6 tiles. So I have ca 180.000.000 cells.
Without the -m flag the process crashed immediatly. So I set this and get the error message above.

The threshold-value I set to 400000.
My laptop has an 2,5GHz processor and 4 GB Ram. When I start the process the CPU is nearly 50% and the memory usage is never higher than 50Mbyte. With the -m flag only 2 MB. Is this normal. Why grass doesn't use more memory for calculating.
This is under windows. I installed a virtual machine with ubuntu and get the same result.

What can I do to process the data. Is the raster to big?
the same with r.fill.dir or how long time takes the calculation for this.

best regards
Alex
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