r.colors.stddev - GRASS GIS manual

Note: This document is for an older version of GRASS GIS that has been discontinued. You should upgrade, and read the current manual page.

NAME

r.colors.stddev - Sets color rules based on stddev from a raster map's mean value.

KEYWORDS

raster, color table

SYNOPSIS

r.colors.stddev

r.colors.stddev --help

r.colors.stddev [-bz] map=name [--help] [--verbose] [--quiet] [--ui]

Flags:

-b: Color using standard deviation bands
-z: Force center at zero
--help: Print usage summary
--verbose: Verbose module output
--quiet: Quiet module output
--ui: Force launching GUI dialog

Parameters:

map=name [required]: Name of raster map

DESCRIPTION
EXAMPLE
SEE ALSO
AUTHOR

DESCRIPTION

r.colors.stddev set raster map color rules based on standard deviations from a map's mean value, either as a continuous color gradient or in color bands per standard deviation (S.D.) from the mean.

With the color band option values less that 1 S.D. from the mean are colored green, within 1-2 S.D. are colored yellow, within 2-3 S.D. are colored red, and beyond 3 S.D. are colored black.

For a differences map there is an option to lock the center of the color table at zero. Values more than two S.D. below the mean will be colored blue; values below the mean but less than 2 S.D. away will transition to white, and above the mean the colors will simularly transition to full red at +2 S.D.

EXAMPLE

North Carolina sample dataset location:

g.region raster=elevation -p
r.colors.stddev elevation

Figure: Standard deviations from mean elevation

AUTHOR

Hamish Bowman, Dunedin, New Zealand

SOURCE CODE

Available at: r.colors.stddev source code (history)

Latest change: Saturday Jun 10 01:17:51 2023 in commit: b8b6a61a54a7d37e20d6abc002f9283ed09653d4