[Qgis-user] Projections of Landsat

[Roi Granot]

Hi Micha,

Thanks for your answer.

Can you please specify how I should implement your suggestions? I'm  
new to QGIS and only used the GUI interface.
Do you a execute a script in the unix terminal to do these?

Roi

On Sep 18, 2009, at 6:57 AM, Micha Silver wrote:

> Roi Granot wrote:
>> Hi All,
>>
>> I'm loading Landsat raster image (.tif) and trying to combine it  
>> with maps I created using GMT (.grd). What's the best way to do this?
>> I tried to first change the Landsat projection to mercator (the  
>> projection I used in GMT) - but the conversion didn't work fine.
> You might find better results using GRASS for this. In general the  
> steps would be:
> 1- create two GRASS locations, one defined in the source CRS  
> (matching the Landsat images) and a second in the target CRS,
> 2- import the Landsat imagery into the first location with r.in.gdal.
> 3- change to the target location and run r.proj to pull in and  
> reproject the Landsat image bands.
>> Also, how can I get rid of the black area surrounding the oblique  
>> Landsat scene (which is filling the image where no data exist) so  
>> that I'll be able to see the background?
> Again with GRASS
> 4- use the r.null model setting the '0' values (black) to NULL.  
> Worked for me...
> 5- and finally merge the bands back together with r.composite, and  
> export back out to a tiff with r.out.tiff
> All the above can be done with the GRASS plugin from within QGIS.
> -- 
> Micha
>>
>> Many questions indeed!
>>
>> Thanks,
>> Roi
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