problem importing 1 degree DEMs

GRASS GRASS user
1

Hello,

First of all, thanks for considering my question. I am not subscribed to the
list, so please send your response to my email address, as well as to the list:
ashton@geog.ucsb.edu

I am trying to import DEM data (which I obtained by downloading via ftp from
the EROS geodata center site) into GRASS 4.1.

The result of the following chain of commands was a GRASS raster file with the
proper dimensions but with no elevation data, according to r.report.

The steps I used to import this are as follows:
1. ran m.dmaUSGSread (within the UNIX command dd). I used ibs= 4096
2. ran m.rot90
3. ran r.in.ll with bpc set to 2, the appropriate corner coords, and as either
signed or unsigned.

My region appears to be set to the same dimensions as the 1 degree DEM I am
trying to import. My region is defined as UTM in the proper zone. If you see
what my problem is, or what questions I need to ask myself, I would be
eternally grateful!

Thanks very much,

/\shton Shortridge
ashton@geog.ucsb.edu

2

Hi Ashton,
  I was able to import a Spearfish example using the following after setting
the region like you did:

dd if=rapid_city-w ibs=4096 | m.dmaUSGSread top=1 bottom=1201 left=1 right=1201
output=spear250.dem logfile=spear250.logfile

m.rot90 input=spear250.dem output=spear250.dem.rot rows=1201 cols=1201 bpc=2

r.in.ll input=spear250.dem.rot output=spear250.dem dimension=1201,1201 bpc=2 re
s
=3,3 corner=sw,44N,104W spheroid=clark66

Good luck! Rick

On Sun, 3 Dec 1995, Ashton Shortridge wrote:

I am trying to import DEM data (which I obtained by downloading via ftp from
the EROS geodata center site) into GRASS 4.1.

The result of the following chain of commands was a GRASS raster file with th

e

proper dimensions but with no elevation data, according to r.report.

The steps I used to import this are as follows:
1. ran m.dmaUSGSread (within the UNIX command dd). I used ibs= 4096
2. ran m.rot90
3. ran r.in.ll with bpc set to 2, the appropriate corner coords, and as eithe

r

signed or unsigned.

My region appears to be set to the same dimensions as the 1 degree DEM I am
trying to import. My region is defined as UTM in the proper zone. If you see
what my problem is, or what questions I need to ask myself, I would be
eternally grateful!

------------------------------------------------------------------------
Rick Thompson- Research Specialist E-mail: rick@cast.uark.edu
Center for Advanced Spatial Technologies Telephone: (501) 575-8498
Ozark Hall Rm. 12 Fax: (501) 575-5218
University of Arkansas
Fayetteville, AR 72701
DISCLAIMER: Any opinions or comments about any product, organization,
            or individual expressed in the above text are my own.