[winGRASS] Re: [GRASS-user] Importing GLOBE DEM data

[Moritz Lennert]

gotnidea! Business Development Centre wrote:
> Yes, it should. But I fail to find any documentation as to how it is 
> done. Even on the page you have mentioned, in example it is given like this:
>  
> "To import GLOBE DEM tiles 
> <http://www.ngdc.noaa.gov/seg/topo/gltiles.shtml> (approx 1km 
> resolution, better than GTOPO30 DEM data), the user has to download 
> additionally the related HDR file(s) 
> <ftp://ftp.ngdc.noaa.gov/GLOBE_DEM/data/elev/esri/hdr/>. Finally, e.g. 
> the 'terrain' color table can be assigned to the imported map with 
> /r.colors/. "
>  
> How am I supposed to do it?

In general, please don't ask questions like "How am I supposed to it", 
but rather questions like: "After having read the manual I tried the 
following command, but I got the following error message" or (if this is 
your only problem) "How do I run r.in.gdal from the GUI ?"

If the man page is not clear, please tell us what information you are 
missing exactly.

In order to access r.in.gdal from the GUI, go to File->Import->Raster 
Map->"Multiple formats using GDAL".

Your data already contains the hdr and clr files.
But if I understand correctly, the data file actually does not contain 
the projection information, so if you use r.in.gdal with the location= 
option, it will just create an xy (unprojected) location.

So you have to create a location with the relevant projection first (see 
http://www.ngdc.noaa.gov/mgg/topo/report/s11/s11H.html).

However, I agree that this is currently a bit difficult in winGRASS...

A solution at this stage might be to use g.proj to create the new 
location (but I don't have access to wingrass right now to test).

In an existing location (for example spearfish) go to Config->Manage 
Projections->"Show projection information..." and enter the following 
parameters:

- check "Create new projection file" flag
- PROJ.4 projection description: +proj=longlat +datum=wgs84
- Name of new location to create: GUJARAT (or whatever you like)

Click on Run.

Now open GRASS in the new location and run r.in.gdal from there. You 
will have to check the "Override projection" flag.

Moritz


>  
> Abhinav
> 
>  
> On 10/28/06, *Markus Neteler* <neteler at itc.it <mailto:neteler at itc.it>> 
> wrote:
> 
>     Hi,
> 
>     r.in.gdal should import it, see
> 
>     http://grass.itc.it/grass63/manuals/html63_user/r.in.gdal.html
> 
>     Markus
> 
>     On Sat, Oct 28, 2006 at 11:14:34AM +0530, gotnidea! Business
>     Development Centre wrote:
>      >    Hi,
>      >
>      >    I have been trying to import GLOBE DEM file from:
>      >
>      >    [1]http://www.ngdc.noaa.gov/cgi-bin/seg/ff/nph-newform.pl/seg/topo/customdatacd?disp=one&sid=peak.140.172.184.251.0610272224463912
>      >
>      >    I don't know what to do next. I have downloaded the file and
>     unzipped it
>      >    to get three files .bil, .hdr and one color file. How should I
>     go about
>      >    using it?
>      >
>      >    Can anyone please guide me? I am using WinGRASS6.3 CVS Native
>     on Windows
>      >    XP,
>      >
>      >    thanks in advance,
>      >
>      >    Abhinav
>      >
>      > References
>      >
>      >    Visible links
>      >    1.
>     http://www.ngdc.noaa.gov/cgi-bin/seg/ff/nph-newform.pl/seg/topo/customdatacd?disp=one&sid=peak.140.172.184.251.0610272224463912
>     <http://www.ngdc.noaa.gov/cgi-bin/seg/ff/nph-newform.pl/seg/topo/customdatacd?disp=one&sid=peak.140.172.184.251.0610272224463912>
> 
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> 
>     --
>     Markus Neteler  <neteler itc it>   http://mpa.itc.it/markus/
>     ITC-irst -  Centro per la Ricerca Scientifica e Tecnologica
>     MPBA - Predictive Models for Biol. & Environ. Data Analysis
>     Via Sommarive, 18        -       38050 Povo (Trento), Italy
> 
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