[GRASSLIST:573] Re:

[lponti at infinito.it]

Dear Maciek,

Yes! That was it. I actually wanted to write "reverse map" 
but I thought the term did not exist.

Thank you,

Luigi


On Tue, 4 Apr 2006 20:14:14 +0200
  Maciek Sieczka <werchowyna at epf.pl> wrote:
> On Tue, 04 Apr 2006 19:50:34 +0200
> lponti at infinito.it wrote:
> 
>> Dear list,
>> 
>> so far, I have been masking either via MASK or 
>>r.mapcalc. 
>> This way, only cells corresponding to MASK would display 
>> in the masked raster.
>> 
>> In contrast, now I would like cells corresponding to a 
>> "mask" NOT to display* in the main raster layer. Is 
>>there 
>> a way to do it?
> 
> Not sure if I really got you right. But if all you need 
>is to revert
> mask, why not:
> 
> g.rename rast=MASK,mask_orig
> g.region rast=mask_orig
> r.mapcalc 'mask_rev=if(isnull(mask_orig),1,null())'
> g.copy rast=mask_rev,MASK
> 
> (Assuming that your valid area in MASK is 1).
> 
> <snip>
> 
> Maciek
> 
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