r.colors.stddev.1grass - Man Page

Sets color rules based on stddev from a raster map’s mean value.


raster, color table


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



Color using standard deviation bands


Force center at zero


Print usage summary


Verbose module output


Quiet module output


Force launching GUI dialog


map=name [required]

Name of raster map


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.


North Carolina sample dataset location:

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

Figure: Standard deviations from mean elevation

See Also

r.colors, r.univar, v.colors


Hamish Bowman, Dunedin, New Zealand

Source Code

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

Accessed: Wednesday Nov 15 17:41:21 2023

Main index | Raster index | Topics index | Keywords index | Graphical index | Full index

© 2003-2023 GRASS Development Team, GRASS GIS 8.3.1 Reference Manual


GRASS 8.3.1 GRASS GIS User's Manual