> I downloaded some AVHRR files from <NOAA Satellite & Information>, > (some thing like this A3164585.L4908097). ... > > How could I import AVHRR into GRASS? You might try r.in.gdal, see: http://grass.ibiblio.org/gdp/html_grass5/html/r.in.gdal.html http://www.remotesensing.org/gdal/frmt_l1b.html Hamish