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

[Daniel Lee]

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?

Daniel

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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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