Thanks, it took a while but it worked. On Mon, Mar 26, 2012 at 3:11 PM, Markus Metz < [email protected]> wrote:
> On Sun, Mar 25, 2012 at 2:59 PM, Filipe Silva Dias > <[email protected]> wrote: > > 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) > > Apparently no basins were determined, probably because the threshold > of 10000 for flow accumulation was never reached. Maybe the current > region was either too small or did not cover parts of the DEM DemPT2? > > BTW, if you want to try out GRASS 7 in a separate mapset, you don't > need to copy over the DEM if you just want to read it. Within the > mapset Grass7, the following commands should work: > g.region -p rast=DemPt@ETRS89 > r.watershed elevation=DemPt@ETRS89 stream=stream threshold=10000 -m > > Markus M > > > > > 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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