Thank you for your answers! I did g.region rast=aster_dem_ggrs and then I run again r.slope.aspect but the problem still remains.
Here is the whole process. 1. I download the tiles from http://www.gdem.aster.ersdac.or.jp/search.jsp 2. Merge them: *gdalwarp ASTG* mosaic.tif* 3. Reproject the raster to greek grid: *gdalwarp -s_srs EPSG:4326 -t_srs EPSG:2100 mosaic.tif dem_temp.tif* 4. Cut out the raster in my area of interest: *gdal_translate -projwin 89749 4490072 296874 4303842 dem_temp.tif dem_GGRS.tif* 5. Import in Grass:* r.in.gdal -o -e input=dem_GGRS.tif output=aster_dem_ggrs* 6. Set the region resolution: *g.region rast=aster_dem_ggrs* 7. Finally I run *r.slope.aspect elevation=aster_dem_ggrs@data slope=slope aspect=aspect* -- View this message in context: http://osgeo-org.1560.n6.nabble.com/Strange-r-slope-aspect-output-of-Aster-dem-tp4571755p4573989.html Sent from the Grass - Users mailing list archive at Nabble.com. _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
