GRASS GIS manual: r.colors.stddev

Note: This document is for an older version of GRASS GIS that is outdated.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

NAME

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

KEYWORDS

raster, color table

SYNOPSIS

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

Flags:

-b: Color using standard deviation bands
-z: Force center at zero
--verbose: Verbose module output
--quiet: Quiet module output

Parameters:

input=name: Name of input raster map

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 rast=elevation -p
r.colors.stddev elevation

AUTHOR

Hamish Bowman, Dunedin, New Zealand

Last changed: $Date: 2011-09-04 06:23:01 -0700 (Sun, 04 Sep 2011) $

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