d.correlate(1grass)

NAME
d.correlate - Prints a graph of the correlation between raster maps (in pairs).

KEYWORDS
display, statistics, raster, diagram, correlation

SYNOPSIS
d.correlate
d.correlate --help
d.correlate map=name[,name,...] [--help] [--verbose] [--quiet] [--ui]

  Flags:

--help
    Print usage summary

--verbose
    Verbose module output

--quiet
    Quiet module output

--ui
    Force launching GUI dialog

  Parameters:

map=name[,name,...] [required]
    Name of raster map(s)

DESCRIPTION
d.correlate displays graphically the results of a r.stats analysis run on two raster map layers. This module highlights the correlation (or lack of it) among data layers (scattergram).

The results are displayed in the active display frame on the user’s graphics monitor. d.correlate erases the active frame before displaying results. If no graphics monitor is open, a file map.png is generated in the current directory.

NOTES
If three or four map layers are specified, the correlation among each combination of two data layers is displayed.

EXAMPLE
Scatterplot of two LANDSAT TM7 channels (North Carolina sample dataset):

g.region raster=lsat7_2002_30 -p
d.correlate map=lsat7_2002_30,lsat7_2002_40

Scatterplot of two LANDSAT TM7 channels

SEE ALSO
d.text, d.graph, r.coin, r.regression.line, r.stats

AUTHORS
Michael Shapiro, U.S.Army Construction Engineering Research Laboratory

Rewritten to GRASS 6 (from csh to sh) by Markus Neteler; from sh to Python by Glynn Clements

SOURCE CODE

Available at: d.correlate source code (history)

Accessed: Thursday Oct 30 22:18:55 2025

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