[GRASS-user] Re: problem using r.watershed

[Markus Metz]

On Sun, Mar 25, 2012 at 12:57 PM, Daniel Lee <lee at isi-solutions.org> wrote:
> Does GRASS 7 use a different algorithm, or why is it only possible on 7?
> Doesn't the -m option work in 6.4 too?

Yes, the -m option works in 6.4 too. But I guess that for the curent
region some of the temporary files will be larger than 2 GB and Large
File Support is needed, which is for wingrass only available in GRASS
7, not in 6.x.

Markus M

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> Am 25. März 2012 12:49 schrieb Markus Metz
> <markus.metz.giswork at googlemail.com>:
>>
>> On Sun, Mar 25, 2012 at 12:30 PM, Filipe Silva Dias
>> <filipesdias at gmail.com> wrote:
>> > I switched the resolution from 30x30 to 100x100 and now it works.
>> > Problem
>> > solved.
>> >
>> >
>> > On Sun, Mar 25, 2012 at 11:12 AM, Filipe Silva Dias
>> > <filipesdias at gmail.com>
>> > wrote:
>> >>
>> >> I'm using GRASS 6.4.2 and I'm on Windows 7
>> >>
>> >>
>> >> On Sun, Mar 25, 2012 at 11:11 AM, Filipe Silva Dias
>> >> <filipesdias at gmail.com> wrote:
>> >>>
>> >>> Dear all
>> >>>
>> >>> I'm trying to run r.watershed on a ASTER DEM (with the size of
>> >>> Portugal)
>> >>> but I'm getting this error:
>> >>>
>> >>> r.watershed elevation=DemPt at ETRS89 stream=stream
>> >>> threshold=10000
>> >>> SECTION 1a (of 5): Initiating Memory.
>> >>> ERROR: G_malloc: unable to allocate 1515173064 bytes at
>> >>> init_vars.c:134
>> >>> Subprocess failed with exit code 1
>> >>> category information for [stream] in [ETRS89] missing or invalid
>> >>>
>> >>> What am I doing wrong?
>> >>>
>> As you figured out already, the region, i.e. number of cells was too
>> large. In order to run r.watershed with that region (Portugal at 30m
>> resolution) on Windows, you would need GRASS 7 and run r.watershed
>> with the -m option.
>>
>> Markus M
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