Hi Markus, I will try that. The GRASS_VECTOR_LOWMEM=1 works only for G7?
best milton 2011/2/12 Markus Metz <[email protected]> > On Sat, Feb 12, 2011 at 11:58 AM, Milton Cezar Ribeiro > <[email protected]> wrote: > > Hi Markus, > > > > Thanks for the reply. In fact a vector-based should solve this. > > But, unfortulatelly, as I am working with a very large raster map > > (48,000 x 60,000 pixels; 250,000 clumps), and GRASS fail when > > I try r.to.vect under Windows/Vista. Is there any other options > > of convert large raster maps to vector, instead of r.to.vect? > > > No, but you could try a recent version of GRASS 7 and after starting > GRASS, set at the commandline > > export GRASS_VECTOR_LOWMEM=1 > > then try r.to.vect > > It will take some time, but it should finish eventually. > > Markus M > > > > > Markus Metz: > >> > >> Milton Cezar Ribeiro: > >> > Dear all, > >> > > >> > I have a raster map where each patch (i.e. forest fragment) have > >> > different > >> > ID. > >> > I need to estimate the perimeter per patch, but R.le.patch can't do > the > >> > job. > >> > >> Have you tried a vector approach? Then the perimeter can be simply > >> uploaded with > >> v.to.db option=perimeter. > >> > >> (Watch out for the fractal problem, both r.le.patch and v.to.db) > >> > >> Markus M > >> > >> > ------------ > >> > GRASS 6.4> r.le.patch map=fragments sam=w per=p1 siz=s1 out=STATS.txt > >> > > >> > PARAMETER CHOICES: > >> > MAP: fragments > >> > SAMPLE: whole map TRACING: 8 neighbor > >> > SIZE MEASURES: > >> > mean patch size > >> > PERIMETER MEASURES: > >> > sum of perims > >> > > >> > R.LE.PATCH IS WORKING....; > >> > > >> > ERROR: G_calloc: unable to allocate 24806 * 8 bytes at alloc_cell.c:83 > >> > ------------ > >> > > >> > Any hint? > >> > > >> > bests > >> > > >> > milton > >> > > >> > _______________________________________________ > >> > grass-user mailing list > >> > [email protected] > >> > http://lists.osgeo.org/mailman/listinfo/grass-user > >> > > >> > > > > > >
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