Quoting Markus Metz <[email protected]>:
On Thu, Sep 1, 2011 at 4:07 PM, Arno Gerretsen <[email protected]> wrote:
I did another attempt to use r.watershed on my big file. This time I
compiled GRASS 6.4.1 from source code and made sure it was configured for
largefiles (--enable-largefile). However I still get errors from r.watershed
and it seems related to the segment file:
GRASS 6.4.1 (ML):~/grass/bin > r.watershed elevation=ML_elev
stream=stream_total accumulation=accumulation_total threshold=10000 --o -m
memory=2000
SECTION 1 beginning: Initiating Variables. 5 sections total.
WARNING: No such file or directory
WARNING: dseg_open(): could not write segment file
WARNING: Subprocess failed with exit code 136
Can anybody tell me what is causing this (and how I could solve it)? In this
case I was using a region of 19800x16200 pixels.
I think the reason is that GRASS could not initialize a temporary
segment file, maybe because of insufficient free disk space?
dseg_open() s called relative late in the initialization process when
a number of other segment files have already been successfully
created. You could try to create a new GRASS database on a different
partition with more free disk space and try r.watershed again.
If possible, you could also try GRASS7 and run r.watershed --verbose,
this will print out estimated disk and memory requirements (and is
much faster than r.watershed -m in GRASS 6).
I am already using the partition with most disk space, there is about
170 GB left.
I think I will give GRASS 7 a go and see if that helps.
Thanks,
Arno
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