[GRASS5] Trouble with r.watershed -m

[Helena Mitasova]

have you tried r.terraflow to see whether it will do the job?
Currently the SFD is not working so the flowtracing is done using
multiple flow direction but you should still be able to get pretty good 
stream network. I just ran it for entire Panama at 90m resolution 
(something around 7000x3000 grid) in impressive 2 hours, see the related 
links at
http://skagit.meas.ncsu.edu/~helena/measwork/panama/panama.html
r.watershed can give more accurate results but as far as I remember the 
segmented version never worked properly and I am not sure whether there 
is an easy fix (as there are probably more problems than the temp file). 
You can still get it done
with r.wtaershed if you split your DEM but it is a lot more work and time.

Helena

Ludwig M Brinckmann wrote:
> I am trying to calculate rivers for a rather larger geographic area in 
> SW China, so my machine runs out of memory if I use the in-memory 
> r.watershed.
> However, r.watershed -m (using disk memory) fails with the following 
> error message:
> 
> WARNING: segment_pagein: No such file or directory
> WARNING: cseg_put(): could not write segment file
> 
> Having a quick look through the (rather old -- nothing wrong with that) 
> code it looks like the temporary file used to store the data is lost 
> somewhere.
> 
> This happens with both grass-61 lastest cvs released version on 
> windows/cygwin as well as with grass 6.1 on suse linux, but not with 
> grass 6.01 on suse, so something has changed.
> 
> 
> Any ideas?
> 
> Ludwig
> 
> 
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