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Note: A new GRASS GIS stable version has been released: GRASS GIS 7.8, available here.
Updated manual page: here


r.region - Sets the boundary definitions for a raster map.


raster, metadata


r.region --help
r.region [-cda] map=name [region=name] [raster=name] [vector=name] [n=value] [s=value] [e=value] [w=value] [align=name] [--help] [--verbose] [--quiet] [--ui]


Set from current region
Set from default region
Auto-adjustment for lat/lon
Attempt to fix small precision errors in resolution and extents
Print usage summary
Verbose module output
Quiet module output
Force launching GUI dialog


map=name [required]
Name of raster map to change
Set region from named region
Set region to match this raster map
Name of vector map
Set region to match this vector map
Value for the northern edge
Value for the southern edge
Value for the eastern edge
Value for the western edge
Raster map to align to

Table of contents


The r.region program allows the user to manage the boundaries of a raster map. These boundaries can be set by the user directly and/or set from a region definition file (stored under the windows directory in the user's current mapset), a raster or vector map, or a 3dview file.

The align parameter sets the current resolution equal to that of the named raster map, and align the boundaries to a row and column edge in the named map. Alignment only moves the existing boundaries outward to the edges of the next nearest cell in the named raster map -- not to the named map's edges. To perform the latter function, use the raster=name option.


After all updates have been applied, the raster map's resolution settings are recomputed from the boundaries and the number of rows and columns in the raster map.

The n=value may also be specified as a function of its current value: n=n+value increases the current northing, while n=n-value decreases it. This is also true for s=value, e=value, and w=value.


Assign absolute coordinates to map:
r.region map=mymap n=220750 s=220000 w=638300 e=639000
Shift map (using offset, here by 100 map units in two directions):
r.region map=mymap n=n+100 e=e+100 w=w+100 s=s+100

SEE ALSO, g.region, v.transform


Glynn Clements
Based upon g.region

Last changed: $Date$


Available at: r.region source code (history)

Note: A new GRASS GIS stable version has been released: GRASS GIS 7.8, available here.
Updated manual page: here

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© 2003-2020 GRASS Development Team, GRASS GIS 7.6.2dev Reference Manual