r.rescale(1grass) GRASS GIS User's Manual r.rescale(1grass)
NAME
r.rescale - Rescales the range of category values in a raster map
layer.
KEYWORDS
raster, rescale
SYNOPSIS
r.rescale
r.rescale --help
r.rescale input=name [from=min,max] output=name to=min,max [ti-
tle=phrase] [--overwrite] [--help] [--verbose] [--quiet] [--ui]
Flags:
--overwrite
Allow output files to overwrite existing files
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--ui
Force launching GUI dialog
Parameters:
input=name [required]
The name of the raster map to be rescaled
from=min,max
The input data range to be rescaled (default: full range of input
map)
output=name [required]
The resulting raster map name
to=min,max [required]
The output data range
title=phrase
Title for new raster map
DESCRIPTION
The r.rescale program rescales the range of category values appearing
in a raster map layer. A new raster map layer, and an appropriate cate-
gory file and color table based upon the original raster map layer, are
generated with category labels that reflect the original category val-
ues that produced each category. This command is useful for producing
representations with a reduced number of categories from a raster map
layer with a large range of category values (e.g., elevation).
Rescaled map layers are appropriate for use in such GRASS GIS commands
as r.stats, r.report, and r.coin.
EXAMPLE
To rescale an elevation raster map layer with category values ranging
from 1090 meters to 1800 meters into the range 0-255, the following
command line could be used (without the from parameter, the full value
range will be used):
r.rescale input=elevation from=1090,1800 output=elevation.255 to=0,255
NOTES
Category values that fall beyond the input range will become NULL.
This allows the user to select a subset of the full category value
range for rescaling if desired. This also means that the user should
know the category value range for the input raster map layer. The user
can request the r.rescale program to determine this range, or can ob-
tain it using the r.describe or r.info command. If the category value
range is determined using r.rescale, the input raster map layer is ex-
amined, and the minimum and maximum non-NULL category values are se-
lected as the input range.
SEE ALSO
r.coin, r.describe, r.info, r.mapcalc, r.reclass, r.rescale.eq, r.re-
port, r.resample, r.stats, r.univar
AUTHOR
Michael Shapiro, U.S.Army Construction Engineering Research Laboratory
SOURCE CODE
Available at: r.rescale source code (history)
Accessed: unknown
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GRASS 7.8.7 r.rescale(1grass)
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