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
16 [title=phrase] [--overwrite] [--help] [--verbose] [--quiet]
17 [--ui]
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19 Flags:
20 --overwrite
21 Allow output files to overwrite existing files
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23 --help
24 Print usage summary
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26 --verbose
27 Verbose module output
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29 --quiet
30 Quiet module output
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32 --ui
33 Force launching GUI dialog
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35 Parameters:
36 input=name [required]
37 The name of the raster map to be rescaled
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39 from=min,max
40 The input data range to be rescaled (default: full range of input
41 map)
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43 output=name [required]
44 The resulting raster map name
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46 to=min,max [required]
47 The output data range
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49 title=phrase
50 Title for new raster map
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53 The r.rescale.eq program rescales the range of category values appear‐
54 ing in a raster map layer with equalized histogram. A new raster map
55 layer, and an appropriate category file and color table based upon the
56 original raster map layer, are generated with category labels that
57 reflect the original category values that produced each category. This
58 command is useful for producing representations with a reduced number
59 of categories from a raster map layer with a large range of category
60 values (e.g., elevation). Rescaled map layers are appropriate for use
61 in such GRASS GIS commands as r.stats, r.report, and r.coin.
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64 To rescale an elevation raster map layer with category values ranging
65 from 1090 meters to 1800 meters into the range 0-255, the following
66 command line could be used (without the from parameter, the full value
67 range will be used):
68 r.rescale.eq input=elevation from=1090,1800 output=elevation.255 to=0,255
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71 Category values that fall beyond the input range will become NULL.
72 This allows the user to select a subset of the full category value
73 range for rescaling if desired. This also means that the user should
74 know the category value range for the input raster map layer. The user
75 can request the r.rescale.eq program to determine this range, or can
76 obtain it using the r.describe or r.info command. If the category
77 value range is determined using r.rescale.eq, the input raster map
78 layer is examined, and the minimum and maximum non-NULL category values
79 are selected as the input range.
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82 r.coin, r.describe, r.info, r.mapcalc, r.reclass, r.rescale, r.report,
83 r.resample, r.stats
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86 Michael Shapiro, U.S.Army Construction Engineering Research Laboratory
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89 Available at: r.rescale.eq source code (history)
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91 Main index | Raster index | Topics index | Keywords index | Graphical
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94 © 2003-2020 GRASS Development Team, GRASS GIS 7.8.5 Reference Manual
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98GRASS 7.8.5 r.rescale.eq(1)