1r.rescale.eq(1) GRASS GIS User's Manual r.rescale.eq(1)
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6 r.rescale.eq - Rescales histogram equalized the range of category val‐
7 ues in a raster map layer.
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10 raster, rescale
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13 r.rescale.eq
14 r.rescale.eq --help
15 r.rescale.eq input=name [from=min,max] output=name to=min,max [ti‐
16 tle=phrase] [--overwrite] [--help] [--verbose] [--quiet] [--ui]
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18 Flags:
19 --overwrite
20 Allow output files to overwrite existing files
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22 --help
23 Print usage summary
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25 --verbose
26 Verbose module output
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28 --quiet
29 Quiet module output
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31 --ui
32 Force launching GUI dialog
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34 Parameters:
35 input=name [required]
36 The name of the raster map to be rescaled
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38 from=min,max
39 The input data range to be rescaled (default: full range of input
40 map)
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42 output=name [required]
43 The resulting raster map name
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45 to=min,max [required]
46 The output data range
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48 title=phrase
49 Title for new raster map
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52 The r.rescale.eq program rescales the range of category values appear‐
53 ing in a raster map layer with equalized histogram. A new raster map
54 layer, and an appropriate category file and color table based upon the
55 original raster map layer, are generated with category labels that re‐
56 flect the original category values that produced each category. This
57 command is useful for producing representations with a reduced number
58 of categories from a raster map layer with a large range of category
59 values (e.g., elevation). Rescaled map layers are appropriate for use
60 in such GRASS GIS commands as r.stats, r.report, and r.coin.
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63 To rescale an elevation raster map layer with category values ranging
64 from 1090 meters to 1800 meters into the range 0-255, the following
65 command line could be used (without the from parameter, the full value
66 range will be used):
67 r.rescale.eq input=elevation from=1090,1800 output=elevation.255 to=0,255
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70 Category values that fall beyond the input range will become NULL.
71 This allows the user to select a subset of the full category value
72 range for rescaling if desired. This also means that the user should
73 know the category value range for the input raster map layer. The user
74 can request the r.rescale.eq program to determine this range, or can
75 obtain it using the r.describe or r.info command. If the category
76 value range is determined using r.rescale.eq, the input raster map
77 layer is examined, and the minimum and maximum non-NULL category values
78 are selected as the input range.
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81 r.coin, r.describe, r.info, r.mapcalc, r.reclass, r.rescale, r.report,
82 r.resample, r.stats
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85 Michael Shapiro, U.S.Army Construction Engineering Research Laboratory
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88 Available at: r.rescale.eq source code (history)
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90 Accessed: Saturday Oct 28 18:17:55 2023
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95 © 2003-2023 GRASS Development Team, GRASS GIS 8.3.1 Reference Manual
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99GRASS 8.3.1 r.rescale.eq(1)