[GRASS-user] Region Definition in GRASS

[Pedro Roma]

Ok but for instance. If my region is defined with a Spatial Resolution of
1kilometer and, if I do some r.mapcalc with two LANDSAT images, the output
image will have which one of the resolutions? the Region or the 2 landsat
images?

Thank you Glynn for the overview. And thank you Hamish for the weblinks

On Thu, Feb 4, 2010 at 7:14 PM, Glynn Clements <glynn at gclements.plus.com>wrote:

>
> Pedro Roma wrote:
>
> > I'm a kind of a new GRASS user and I'm a bit lost on regarding something.
> > REGION (or spatial extent).
> > For instance the Location North-Carolina. When the location was created a
> > certain extent, projkection a Spatial Resolution was defined. But, inside
> > this location there is a lot of data with different extent and regional
> > cover. And, inside GRASS I can re-define region properties (g.region) and
> > use a certain data to define region. And, it's possible to have a region
> > with a small extent than a vectorial that exists in the Location.
> > My question is, what is the region and what is its purpose? Because I
> don't
> > see any impact of region over my image/data processing or image
> > visualization. Or is it?
>
> The region is mostly used for raster processing and graphical display.
>
> Most commands which read or write raster maps will use the bounds and
> resolution from the current region. Any input maps will be cropped,
> padded and/or resampled according to the region settings.
>
> Display commands translate geographic or cartographic coordinates to
> display coordinates such that the current region just fits inside the
> display window.
>
> Vector commands are normally unaffected by the current region.
>
> --
> Glynn Clements <glynn at gclements.plus.com>
>
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