Am Dienstag, den 15.06.2010, 06:39 -0700 schrieb varunvarma: > Hi, I am a new user to GRASS and have run into a problem while processing > rasters > > I have 2 raster files (TIFFs) which I have loaded with GRASS in QGIS 1.0.2 > Kore. The rasters contain values of 0 and 1 and represent 2 time steps. What > I wanted to do is either a simple addition of the 2 rasters or apply an OR > operator between them. For this I used the r.mapcalc and r.mapcalculator > tool. However, the cell size of the resulting raster is increased from 250m > to 2500m which leads to loss of fine scale information. > > Does anyone know why this is happening and what I could do to maintain the > fine scale information? > > Thank you
Hi however, please check the actual resolution with g.region -p. Is the result res=2500? If so, set region with g.region -ap res=250 or with g.region rast=inputrasterfile. You can controll it again with g.region -p. After this settings run r.mapcalc again. Regards, Manfred _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user