r.region(1)

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

KEYWORDS
raster, metadata, geometry

SYNOPSIS
r.region
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]

  Flags:

-c
    Set from current region

-d
    Set from default region

-a
    Auto-adjustment for lat/lon
    Attempt to fix small precision errors in resolution and extents

--help
    Print usage summary

--verbose
    Verbose module output

--quiet
    Quiet module output

--ui
    Force launching GUI dialog

  Parameters:

map=name [required]
    Name of raster map to change

region=name
    Set region from named region

raster=name
    Set region to match this raster map

vector=name
    Name of vector map
    Set region to match this vector map

n=value
    Value for the northern edge

s=value
    Value for the southern edge

e=value
    Value for the eastern edge

w=value
    Value for the western edge

align=name
    Raster map to align to

DESCRIPTION
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.

NOTES
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.

EXAMPLES

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 the NS direction, -50 in the EW direction):

r.region map=mymap n=n+100 e=e-50 w=w-50 s=s+100

SEE ALSO
r.support, g.region, v.transform

AUTHOR
Glynn Clements
Based upon g.region

SOURCE CODE

Available at: r.region source code (history)

Accessed: Saturday May 09 12:58:59 2026

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