[GRASS-user] Re: Region definition

Marcello Gorini gorini at gmail.com
Sat Mar 26 09:10:38 EDT 2011

Luisa Peña wrote:
> Greetings
> I have a raster map with a size like 25000 x 30000 with valid values on
> all
> its extent. With another raster, I defined a sub-extent of this raster,
> much
> smaller where only a small area is valid and the rest it NULL() like this:
> r.mapcalc output = if(regional_area at PERMANENT>0,2004 at Reg,null())
> In this case, regional_area is a smaller area and I want to select only a
> portion of 2004 at Reg that falls inside regional_area.
> So I obtained output as a raster map with only some values (4000x3000)
> If I define g.region rast=output I still obtain a 25000 x30000 region
> which
> does not make sense since I only have a small valid area.
> How can I define a region, using g.region for only output valid pixels?
> Thanks
> Luisa
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g.region zoom=output ?

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