NAME
r.circle - Creates a raster map containing concentric rings around a given point
KEYWORDS
raster
SYNOPSIS
r.circle
r.circle help
r.circle [-b] output=name coordinate=x,y [min=float] [max=float] [mult=float] [--overwrite]
Flags:
- -b
- Generate binary raster map
- --overwrite
- Force overwrite of output files
Parameters:
- output=name
- Name for output raster map
- coordinate=x,y
- 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)
- mult=float
- Multiplier
DESCRIPTION
This module creates a raster map containing concentric rings around a given
point. The cell values are increasing linear from the center point to outer
rings. Minimum and maximum radius can be selected. Optionally a "donut" ring
can be created to use as (binary) filter for i.ifft inverse Fourier
transform (apply filter with r.mask).
EXAMPLES
Generate a circle at current map center with a radius of 300m:
EASTCENTER=`g.region -c | awk ' /region center easting:/ { print $4 }'`
NORTHCENTER=`g.region -c | awk ' /region center northing:/ { print $4 }'`
r.circle -b out=circle coordinate=$EASTCENTER,$NORTHCENTER max=300
SEE ALSO
g.remove,
g.rename,
i.fft,
i.ifft
AUTHOR
Bill Brown, U.S. Army Construction Engineering Research Laboratory
Additional flag/min/max parameter by Markus Neteler, University of Hannover
Last changed: $Date: 2006/04/13 19:01:37 $
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