Hi,
I'm a new grass user and would like to import some USGS DEM data.
This is what I have done:
downloaded las_vegas-e.gz from edcftp.cr.usgs.gov/pub/data/DEM/250/L
decompressed with gzip
dd if=las_vegas-e ibs=10240 | m.dmaUSGSread top=1 bottom=1201 \
left=1 right=1201 output=las_vegas-e.dat logfile=las_vegas-e.log
m.rot input=las_vegas-e.dat output=las_vegas-e.dem \
rows=1201 cols=1201 bpc=2
r.in.ll input=las_vegas-e.dem output=dem.utm dimension=1201,1201 \
bpc=2 res=3,3 corner=sw,34N,119W spheroid=wgs72
g.region rast=dem.utm
d.rast dem.utm
All that is displayed is a single very narrow strip.
I'd appreciate some pointers to where I am going wrong. I've tried
get information from moon but can't seem to download any of the archive
material or help docs.
Thanks.
*******************************************************************
James Curry
Lawrence Livermore National Laboratory
P.O. Box 808, MS: L-183
Livermore, California 94550
(510) 423-1106
*******************************************************************
"James" == James Curry <jcurry@llnl.gov> writes:
James> Hi,
James> I'm a new grass user and would like to import some USGS DEM
James> data. This is what I have done:
James> downloaded las_vegas-e.gz from
James> edcftp.cr.usgs.gov/pub/data/DEM/250/L decompressed with
James> gzip
James> dd if=las_vegas-e ibs=10240 | m.dmaUSGSread top=1 bottom=1201 \
James> left=1 right=1201 output=las_vegas-e.dat logfile=las_vegas-e.log
These are not the options I use with dd. From
<ftp://edcftp.cr.usgs.gov/pub/data/DEM/250/00README>:
RECORD DELIMITERS:
The DEM files do not contain record delimiters. You can add delimiters by
using the following UNIX command:
dd if=inputfilename of=outputfilename ibs=4096 cbs=1024 conv=unblock
I'm not sure that would explain your results, though. Is the strip
about 1/10th the correct size (1024/10240)?
James> [deleted stuff looks OK ...]
James> All that is displayed is a single very narrow strip.
James> I'd appreciate some pointers to where I am going wrong. I've tried
James> get information from moon but can't seem to download any of the arch
ive
James> material or help docs.
James> Thanks.
James> *******************************************************************
James> James Curry
James> Lawrence Livermore National Laboratory
James> P.O. Box 808, MS: L-183
James> Livermore, California 94550
James> (510) 423-1106
James> *******************************************************************
--
Bill Perkins
Battelle Pacific Northwest Laboratories
Environmental Technologies Division, Subsurface Flow and Transport
P.O. Box 999 MSIN K9-36
Richland, Washington, USA 99352
voice: (509) 372-6131 fax: (509) 372-6328 email: wa_perkins@pnl.gov
On Tue, 19 Mar 1996, James Curry wrote:
I'd appreciate some pointers to where I am going wrong. I've tried
get information from moon but can't seem to download any of the archive
material or help docs.
I have encountered problems in the past importing USGS DEM data. You
might want to check:
http://www.cecer.army.mil/grass/faq.html
--G
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