On Mon, Jan 28, 2013 at 7:33 PM, Surendran Neelakantan <surendra...@gmail.com> wrote: > Hi > > I am a new user of GRASS > > I have been working on a python Geo-processing tool in ESRI ARCGIS desktop. > This is basically a DEM data processing which involves "Extract by Mask" > "Flow Direction", "Flow Accumulation","Slope" ,"Watershed" ,"Zonal > statistics " > > I would like to rewrite the tool to make it work with GRASS so that > later everyone can use this. I have gone through the documentation but I > really not able to figure out the equivalent commands in Grass.
First of all, set the region to the DEM with g.region -p rast=DEM Create a MASK with r.mask or r.mapcalc or r.to.vect Zoom to the masked area g.region -p zoom=DEM Note that there is no need to clip or extract a subregion of the DEM if the region is set properly Flow direction, flow accumulation, watershed can be calculated with r.watershed Slope can be calculated with r.slope.aspect Zonal statistics can be calculated with r.univar or r.statistics or r.statistics2 or r.statistics3, depending on the desired output. HTH, Markus M _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
