On Sat, Feb 12, 2011 at 5:11 AM, Milton Cezar Ribeiro <[email protected]> wrote: > 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 > > _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
