[GRASS-user] Problem with display of Raster file.

[Michael Barton]

On Feb 20, 2008, at 11:48 PM, grass-user-request at lists.osgeo.org wrote:

> Date: Thu, 21 Feb 2008 12:09:52 +0530
> From: "Kunal Malik" <kunal.malik81 at gmail.com>
> Subject: Re: [GRASS-user] Problem with display of Raster file.
> To: "Glynn Clements" <glynn at gclements.plus.com>,
> 	jachym.cepicky at gmail.com
> Cc: grass-user at lists.osgeo.org
> Message-ID:
> 	<b7bad6650802202239i4a5a912fh956af66d67a9f2ec at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> HI!
> I am  trying to display the tif file ,,
>
> by first importing  the tif file by
> r.in.gdal -e in=nf42_geo.tif out=tm
> WARNING: Datum 'unknown' not recognised by GRASS and no parameters  
> found.
>          Datum transformation will not be possible using this  
> projection
>          information.
>  Projection of input dataset and current location appear to match.
> Proceeding with import...
>  100%
> CREATING SUPPORT FILES FOR tm.red
> SETTING GREY COLOR TABLE FOR tm.red (8bit, full range)
>  100%
> CREATING SUPPORT FILES FOR tm.green
> SETTING GREY COLOR TABLE FOR tm.green (8bit, full range)
>  100%
> CREATING SUPPORT FILES FOR tm.blue
> SETTING GREY COLOR TABLE FOR tm.blue (8bit, full range)
>  r.in.gdal complete.
>
> now i am trying to display the imported file..
> i got the error
>
>  g.region rast=tm
> ERROR: raster map <tm> not found.

GDAL imports multband files (including multiband tifs) by creating a  
raster map/image for each band. GRASS does not store files in a  
multiband format. It also imports RGB files in the same way,  
splitting them into their red, green, and blue components. You can  
display them as an RGB color-fused image by using d.rgb (not the  
brightness setting too) or by recombining them into a single RGB  
using r.composite.

Michael


>
> when i observe three files are created in PERMANENT/cats
> tm.red,tm.blue,tm.green.
> but it is not the actual file that i want to see..
>  Please tell how could i display it.
> Thanks in Advance
>