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

6       r.median   -  Finds  the  median  of values in a cover map within areas
7       assigned the same category value in a user-specified base map.
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KEYWORDS

10       raster
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SYNOPSIS

13       r.median
14       r.median help
15       r.median base=string cover=string output=string  [--overwrite]
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17   Flags:
18       --overwrite
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20   Parameters:
21       base=string
22           Base raster map
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24       cover=string
25           Cover raster map
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27       output=string
28           Resultant raster map
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DESCRIPTION

31       r.median calculates the median category of data contained  in  a  cover
32       raster  map  layer  for  areas  assigned the same category value in the
33       user-specified base raster map layer.  These median values  are  stored
34       in the new output map layer.
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36       The output map is actually a reclass of the base map.  The base  map is
37       an existing raster map layer in the user's current mapset search  path.
38       For  each  group  of cells assigned the same category value in the base
39       map, the median of the values assigned these cells  in  the  cover  map
40       will be computed.
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42       The  cover map is an existing raster map layer containing the values to
43       be used to compute the median within each category of the base map.
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NOTES

46       The user should use the results of  r.median  with  care.   Since  this
47       utility  assigns a value to each cell which is based on global informa‐
48       tion (i.e., information at spatial locations other than just the  loca‐
49       tion  of the cell itself), the resultant map layer is only valid if the
50       geographic region and mask settings are the same as they  were  at  the
51       time that the result map was created.
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53       Results are affected by the current region settings and mask.
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SEE ALSO

56       g.region, r.average, r.cats, r.clump, r.describe, r.mapcalc, r.mfilter,
57       r.mode, r.neighbors, r.reclass, r.stats
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AUTHOR

60       Michael Shapiro, U.S.Army Construction Engineering Research Laboratory
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62       Last changed: $Date: 2006/04/13 19:01:37 $
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64       Full index
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68GRASS 6.2.2                                                        r.median(1)
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