[GRASS-user] import satellite data in Grass

[Martina Schaefer]

Hi,

I'm new with Grass and I don't have somebody around me knowing well 
Grass and besides all the documentation and tutorials that I've found, I 
have some beginner questions...

I have several satellite data sets, that I would like to import in Grass.

These sets are:
- devpan_2000_mos.tif, .rrd, .aux, .tif.aux
- S4_07935_7537_20070828_p10_1_lcc00.tif, .xml with files 
selected_zone-zone_selectionnee.dbf, prj, shp and shx as well as
spot_footprint-empreinte_spot.dbf, prj, shp and shx
- oa16787_087.img


What I am doing is:
- enter Grass with the spearfish60 tutorials
- then trying to create a new location
in the first case this is:
r.in.gdal -e devpan_2000_mos.tif location=DevonNew output=testfile
and I get this error
ERROR 4: `devpan_2000_mos.tif.aux' not recognised as a supported file 
format.
A datum name wgs84 (WGS_1984) was specified without transformation 
parameters.
Note that the GRASS default for wgs84 is towgs84=0.000,0.000,0.000.
  100%
CREATING SUPPORT FILES FOR testfile
SETTING GREY COLOR TABLE FOR testfile (8bit, full range)
r.in.gdal complete.

in the second case this is:
  r.in.gdal -e 
../Geobase/s4_07935_7537_20070828_p10_lcc00/S4_07935_7537_20070828_p10_1_lcc00.tif 
location=DevonGeo output=testfile2
and I get once more somme warnings
WARNING: Datum 'Not_specified_based_on_GRS_1980_ellipsoid' not recognised
          by GRASS and no parameters found. Datum transformation will not be
          possible using this projection information.
  100%
CREATING SUPPORT FILES FOR testfile2
SETTING GREY COLOR TABLE FOR testfile2 (8bit, full range)
r.in.gdal complete.


in the third cas this is:
r.in.gdal -e oa16787_087.img location=DevonIMG output=test3
with the following error
ERROR 4: `oa16787_087.img' not recognised as a supported file format.


In the first two cases I can visualize my data then by exiting and 
starting GRASS again.
But I'm not sure about the warnings and errors that I got. And in the 
third case I can't access my data.

Can somebody help me with these questions?

And, is there a way to open several files in the same time? In fact, I 
don't have only these 3 types of data, but also several maps of these 
type that I would like to put together or at least to visualize together 
without leaving and starting Grass every time!


I'll have some more questions about the analaysis  that I want to do 
later, but hopefully these problems could be solved first!

Thanks a lot for your help,

Martina