Thanks. Out of curiosity and tried with Grass 7 with -m (and 30 m resolution) and I obtained this error message:
r.watershed -m elevation=DemPT2@Grass7 threshold=10000 stream=streams SECTION 1 beginning: Initiating Variables. 5 sections total. SECTION 1a: Mark masked and NULL cells SECTION 1b: Determining Offmap Flow. SECTION 2: A* Search. SECTION 3: Accumulating Surface Flow with MFD. SECTION 4: Watershed determination. SECTION 5: Closing Maps. ERROR: Rast_make_random_colors: min (1) > max (0) Subprocess failed with exit code 1 category information for [streams] in [Grass7] missing or invalid On Sun, Mar 25, 2012 at 11:49 AM, Markus Metz < [email protected]> wrote: > On Sun, Mar 25, 2012 at 12:30 PM, Filipe Silva Dias > <[email protected]> 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 < > [email protected]> > > 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 > >> <[email protected]> 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@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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