Pedro, If you run a r.mapcalc, the extent and resolution will follow the current region. So, check g.region -p before run r.mapcalc. You can use g.region rast=MapLandsat to set the current region to use MapLandsat dimensions as reference. After you can reset your extention and resolution using g.region -d . By the way, read g.region --help.
best milton 2010/2/5 Pedro Roma <pedroroma1...@gmail.com> > > 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 > <gl...@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 <gl...@gclements.plus.com> >> > > > _______________________________________________ > grass-user mailing list > grass-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/grass-user > >
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