man r.circle () - Creates a raster map containing concentric rings around a given point.
NAME
r.circle - Creates a raster map containing concentric rings around a given point.
SYNOPSIS
r.circle
r.circle help
r.circle [-b] output=string coordinate=x,y [min=float] [max=float] [mult=float]
Flags:
- "-b
- Generate binary raster map
Parameters:
- "output=string
- Name for new raster file
- "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, r.mask
AUTHOR
Bill Brown, U.S. Army Construction Engineering Research Laboratory
Additional flag/min/max parameter by Markus Neteler, University of Hannover
Last changed: $Date: 2003/05/06 12:50:53 $
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