r.circle(1grass) GRASS GIS User's Manual r.circle(1grass)
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 param-
eter.
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 fil-
ter 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 Han-
nover
SOURCE CODE
Available at: r.circle source code (history)
Accessed: unknown
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GRASS 7.8.7 r.circle(1grass)
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