r.region - GRASS GIS manual

Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.

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
NOTES
EXAMPLES
SEE ALSO
AUTHOR

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

AUTHOR

Glynn Clements
Based upon g.region

SOURCE CODE

Available at: r.region source code (history)

Latest change: Thu Aug 27 14:09:44 2020 in commit: ecf4e84bd68ce6067953e5a403cefb698b29db14