[GRASS-user] r.watershed

[Alexander Schulze]

Hi.

is there nobody who has experience with r.watershed. And could me say if 
something is wrong or wathever.
Now the process runs more than 2 days and nothing

r.watershed -m elevation=dem.senkenloseHoehenkarte4 threshold=400000  	 
                accumulation=dem.Akkumulation400000 

	       drainage=dem.Fliessrichtung_Drainage400000             			 
  basin=Wassereinzugsgebiete400000
	       stream=dem.Fliesswassersegmente400000

SECTION 1 beginning: Initiating Variables. 5 sections total.
SECTION 1b (of 5): Determining Offmap Flow.
WARNING: segment_pagein: read EOF
WARNING: seg_put(): could not write segment file

After 20 minutes these warnings appear and then ....

Does somebody know what these warnings means?

Crashes the process or should I wait?

thanks in advance
Alex

Alex Schulze schrieb:
> 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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