This is the command r.circlegrass that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
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
Use r.circlegrass online using onworks.net services