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r.circle

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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.

KEYWORDS

raster

SYNOPSIS

r.circle r.circle help r.circle [-b] output=name coordinate=x,y [min=float] [max=float] [mult=float] [--overwrite] [--verbose] [--quiet] Flags: -b Generate binary raster map --overwrite Allow output files to overwrite existing files --verbose Verbose module output --quiet Quiet module output 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 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
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 Hannover Last changed: $Date: 2009-01-05 23:08:26 +0100 (Mon, 05 Jan 2009) $ Full index (C) 2003-2010 GRASS Development Team R.CIRCLE(1)
 
 
 

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