r.rescale.eq(1)

1r.rescale.eq(1)               Grass User's Manual              r.rescale.eq(1)
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NAME

6       r.rescale.eq  - Rescales histogram equalized the range of category val‐
7       ues in a raster map layer.
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KEYWORDS

10       raster
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SYNOPSIS

13       r.rescale.eq
14       r.rescale.eq help
15       r.rescale.eq   [-q]   input=string     [from=min,max]     output=string
16       to=min,max  [title="phrase"]   [--overwrite]
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18   Flags:
19       -q  Quiet
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21       --overwrite
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23   Parameters:
24       input=string
25           The name of the raster map to be rescaled
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27       from=min,max
28           The  input  data range to be rescaled (default: full range of input
29           map)
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31       output=string
32           The resulting raster map name
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34       to=min,max
35           The output data range
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37       title=
38           Title for new raster map
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DESCRIPTION

41       The r.rescale.eq program rescales the range of category values  appear‐
42       ing  in  a raster map layer with equalized histogram.  A new raster map
43       layer, and an appropriate category file and color table based upon  the
44       original  raster  map  layer,  are  generated with category labels that
45       reflect the original category values that produced each category.  This
46       command  is  useful for producing representations with a reduced number
47       of categories from a raster map layer with a large  range  of  category
48       values  (e.g., elevation).  Rescaled map layers are appropriate for use
49       in such GRASS programs as r.stats, r.report, and r.coin.
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EXAMPLE

52       To rescale an elevation raster map layer with category  values  ranging
53       from  1090  meters  to  1800 meters into the range 0-255, the following
54       command line could be used: r.rescale.eq input=elevation from=1090,1800
55       output=elevation.255 to=0,255
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NOTES

58       Category  values  that  fall  beyond  the input range will become NULL.
59       This allows the user to select a subset  of  the  full  category  value
60       range  for  rescaling if desired.  This also means that the user should
61       know the category value range for the input raster map layer.  The user
62       can  request  the  r.rescale.eq program to determine this range, or can
63       obtain it using the r.describe or  r.info  command.   If  the  category
64       value  range  is  determined  using  r.rescale.eq, the input raster map
65       layer is examined, and the minimum and maximum non-NULL category values
66       are selected as the input range.
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AUTHOR

73       Michael Shapiro, U.S.Army Construction Engineering Research Laboratory
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75       Last changed: $Date: 2003/05/06 15:26:05 $
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77       Full index
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81GRASS 6.2.2                                                    r.rescale.eq(1)