I'm having nothing but trouble trying to import USGS DEM's, either 7.5 type or 1 degree versions, into my GRASS5 using m.dem.extract. Errors include "data not found in correct file" and m.rot90 subroutine not finding file to work on. Anyone out there who uses this command regularly I could talk to in an effort to get it to work for me? Many thanks, tom at bluesky.org