[GRASS-user] project units vs. imported image units ?

[Ricardo Oliveira]

Thanks for the quick replies.
I have been testing the solutions:

I can use g.region to create different regions (with specific grid size) so they can match the resolution of the tifs i am importing (this will be useful because the tifs have different resolutions). After that r.region -c will recompute the image to the extents of the current region. This seems to be what i needed :D

Again, thank you
Ricardo

On Tue, 20 Mar 2007 13:19:23 -0700, "Amaginary Studios"
<amagine at telus.net> said:
> Hmmm,
> 
> I believe you will need to specify the correct "resolution" in your  
> "g.region" settings which will ... match the resolution of your .tiff  
> files
> 
> .tfw files are simply Text files so I suppose you could create your  
> own within a text editor.
> 
> for example a .twf file with the following
> 
> ****
> 
> 1         nresolution
> 0         x-pixel position reference point
> 0         y-pixel position reference point
> -1        sresolution
> 0         x-postion reference
> 0         y-position reference
> 
> ****
> 
> says,  that each pixel in the tiff image is equal to 1x1 (in your  
> case probably meters).  and the Top left corner is referenced at 0m x  
> 0m.
> 
> So, it is a matter of matching your image resolution size to the  
> correct resolution region settings in GRASS.
> 
> I hope this helps a bit...
> 
> Mars
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