1r.circle(1)                   Grass User's Manual                  r.circle(1)
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NAME

6       r.circle   -  Creates a raster map containing concentric rings around a
7       given point
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KEYWORDS

10       raster
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SYNOPSIS

13       r.circle
14       r.circle help
15       r.circle [-b]  output=name  coordinate=x,y   [min=float]    [max=float]
16       [mult=float]   [--overwrite]
17
18   Flags:
19       -b  Generate binary raster map
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21       --overwrite
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23   Parameters:
24       output=name
25           Name for output raster map
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27       coordinate=x,y
28           The coordinate of the center (east,north)
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30       min=float
31           Minimum radius for ring/circle map (in meters)
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33       max=float
34           Maximum radius for ring/circle map (in meters)
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36       mult=float
37           Multiplier
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DESCRIPTION

40       This  module  creates a raster map containing concentric rings around a
41       given point.  The cell values are increasing  linear  from  the  center
42       point  to  outer  rings.  Minimum  and  maximum radius can be selected.
43       Optionally a "donut" ring can be created to use as (binary) filter  for
44       i.ifft inverse Fourier transform (apply filter with r.mask).
45

EXAMPLES

47       Generate a circle at current map center with a radius of 300m:
48             EASTCENTER=`g.region -c |  awk ' /region center easting:/ { print
49       $4 }'`
50             NORTHCENTER=`g.region -c | awk  '  /region  center  northing:/  {
51       print $4 }'`
52             r.circle    -b   out=circle   coordinate=$EASTCENTER,$NORTHCENTER
53       max=300
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SEE ALSO

57       g.remove, g.rename, i.fft, i.ifft
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AUTHOR

60       Bill Brown, U.S. Army Construction Engineering Research Laboratory
61       Additional flag/min/max parameter by Markus Neteler, University of Han‐
62       nover
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64       Last changed: $Date: 2006/04/13 19:01:37 $
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66       Full index
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70GRASS 6.2.2                                                        r.circle(1)