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.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
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).
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
g.region,
g.remove,
g.rename,
i.fft,
i.ifft,
r.mask
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)
Latest change: Thursday Jan 26 14:10:26 2023 in commit: cdd84c130cea04b204479e2efdc75c742efc4843
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© 2003-2024
GRASS Development Team,
GRASS GIS 8.3.3dev Reference Manual