[GRASS-user] Mosaic

[Nikos Alexandris]

On Fri, 2008-08-08 at 09:53 -0300, Raphael Saldanha wrote:
> Hi Nikos!
> 
> Thanks for the advice!
> 
> So, I use this:
> 
> Set null values: > r.nul
> Set region: > g.region
> Create mosaic: > r.patch
> 
> 
> Thanks!!!
> 
> 
> 
> 
> On Fri, Aug 8, 2008 at 9:26 AM, Nikos Alexandris
> <nikos.alexandris at felis.uni-freiburg.de> wrote:
>         
>         On Fri, 2008-08-08 at 08:57 -0300, Raphael Saldanha wrote:
>         > Hi!
>         >
>         > A newbie doubt: I have to make a mosaic with 2 satellite
>         images
>         > (CBERS). The border values are "0". What is the procedure?
>         (the images
>         > are already on grass).
>         >
>         > Raphael Saldanha
>         > BRAZIL
>         
>         
>         Hi Raphael.
>         
>         If your images are correctly georeferenced then you only need
>         to use
>         r.patch or r.mapcalc.
>         
>         Set the extent of the computational region with g.region
>         first, for
>         example:
>         g.region rast=satimage1,satimage2 -pa
>         
>         Then patch:
>         r.patch in=satimage1,satimage2 out=mosaic
>         
>         Kind regards, Nikos.
>         
[cc-ing to the list]

Raphael, it is not required to set any NULL values I think, except if
you need it for your own reasons to set NULL values.

Cheers, Nikos