r.circle(1)

NAME
r.circle - Creates a raster map containing concentric rings around a given point.

KEYWORDS
raster, buffer, geometry, circle

SYNOPSIS
r.circle
r.circle --help
r.circle [-b] output=name coordinates=east,north [min=float] [max=float] [multiplier=float] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

  Flags:

-b
    Generate binary raster map

--overwrite
    Allow output files to overwrite existing files

--help
    Print usage summary

--verbose
    Verbose module output

--quiet
    Quiet module output

--ui
    Force launching GUI dialog

  Parameters:

output=name [required]
    Name for output raster map

coordinates=east,north [required]
    The coordinate of the center (east,north)

min=float
    Minimum radius for ring/circle map (in meters)

max=float
    Maximum radius for ring/circle map (in meters)

multiplier=float
    Data value multiplier

DESCRIPTION
This module creates an output raster map centered on the x,y values specified with the coordinate parameter, out to the edge of the current region. The output cell values increase linearly from the specified center. The min and max parameters control the inner and outer output raster map radii, respectively.

The mult parameter can be used to multiply the output raster cells by a common factor. Note that this parameter does not affect the output raster position or size; only the z-values are changed with this parameter.

Binary-output raster maps (solid circles of one value) can be created with the -b flag. Raster maps so created can be used to create binary filters for use in i.ifft (inverse Fourier transformations; apply filter with r.mask).

EXAMPLES
Generate a raster circle at current map center with a radius of 300m and outwardly increasing raster values:

EASTCENTER=`g.region -c |  awk ’ /center easting:/ { print $3 }’`
NORTHCENTER=`g.region -c | awk ’ /center northing:/ { print $3 }’`
r.circle output=circle coordinate=${EASTCENTER},${NORTHCENTER} max=300

Generate a binary raster ring around current map center with an inner radius of 500m and an outer radius of 1000m:

EASTCENTER=`g.region -c |  awk ’ /center easting:/ { print $3 }’`
NORTHCENTER=`g.region -c | awk ’ /center northing:/ { print $3 }’`
r.circle -b output=circle coordinate=${EASTCENTER},${NORTHCENTER} min=500 max=1000

SEE ALSO
g.region, g.remove, g.rename, i.fft, i.ifft, r.mask

AUTHOR
Bill Brown, U.S. Army Construction Engineering Research Laboratory
Additional flag/min/max parameter by Markus Neteler, University of Hannover

SOURCE CODE

Available at: r.circle source code (history)

Accessed: Wednesday Jun 11 21:28:08 2025

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