The problem was solved (at least visually removed the fishnet) using *-r cubic* in gdalwarp. Thank you for your information! -- View this message in context: http://osgeo-org.1560.n6.nabble.com/Strange-r-slope-aspect-output-of-Aster-dem-tp4571755p4623064.html Sent from the Grass - Users mailing list archive at Nabble.com.