USGS dems into grass

[Wang Song]

	Have you tryed to use command "m.dem.extract" to extract your DEMS ?

	The command don't have to read from a tape drive, it could read from a
disk file. Usually, you could try blocksize of 4096 or 10240 when the GRASS
command ask for it. Your DEMS are 7.5 minute USGS DEMs, right ?

Song Wang
CAST/NCRI


> I have one of the ever-popular USGS dems here.  It came from the Reston ftp site, and I want to bring it into Grass.  I am specifically interested in hearing from someone who has already done this SUCCESSFULLY.  I know that there must be someone out there who has.  
> 
> My attempts so far have been to use the commands m.dmaUSGSread and m.rot90 and r.in.ll.  These have lead to unreadable, smeared DEMs.  I have only been able to view the DEM after some row-col calculations, a new header, and the use of r.in.ascii.  However, the file still needs to be rotated 90 degrees counter-clockwise.  So I'm still stuck.
> 
> Please lend a hand and I'll summarize the info I get.
> 
> Thanks.  I'll give out any additional info I can if it's needed.
> 
> -Eric