.TH d.correlate 1grass "" "GRASS 8.3.1" "GRASS GIS User's Manual"
.SH NAME
\fI\fBd.correlate\fR\fR  \- Prints a graph of the correlation between raster maps (in pairs).
.SH KEYWORDS
display, statistics, raster, diagram, correlation
.SH SYNOPSIS
\fBd.correlate\fR
.br
\fBd.correlate \-\-help\fR
.br
\fBd.correlate\fR \fBmap\fR=\fIname\fR[,\fIname\fR,...]  [\-\-\fBhelp\fR]  [\-\-\fBverbose\fR]  [\-\-\fBquiet\fR]  [\-\-\fBui\fR]
.SS Flags:
.IP "\fB\-\-help\fR" 4m
.br
Print usage summary
.IP "\fB\-\-verbose\fR" 4m
.br
Verbose module output
.IP "\fB\-\-quiet\fR" 4m
.br
Quiet module output
.IP "\fB\-\-ui\fR" 4m
.br
Force launching GUI dialog
.SS Parameters:
.IP "\fBmap\fR=\fIname[,\fIname\fR,...]\fR \fB[required]\fR" 4m
.br
Name of raster map(s)
.SH DESCRIPTION
\fId.correlate\fR displays graphically the results of a
\fIr.stats\fR analysis run on two raster map layers. This module
highlights the correlation (or lack of it) among data
layers (scattergram).
.PP
The results are displayed in the active display frame on
the user\(cqs graphics monitor. \fId.correlate\fR erases
the active frame before displaying results. If no graphics monitor
is open, a file map.png is generated in the current directory.
.SH NOTES
If three or four map layers are specified, the correlation
among each combination of two data layers is displayed.
.SH EXAMPLE
Scatterplot of two LANDSAT TM7 channels (North Carolina sample dataset):
.PP
.br
.nf
\fC
g.region raster=lsat7_2002_30 \-p
d.correlate map=lsat7_2002_30,lsat7_2002_40
\fR
.fi
.br
Scatterplot of two LANDSAT TM7 channels
.SH SEE ALSO
\fI
d.text,
d.graph,
r.coin,
r.regression.line,
r.stats
\fR
.SH AUTHORS
Michael Shapiro,
U.S.Army Construction Engineering Research Laboratory
.PP
Rewritten to GRASS 6 (from csh to sh) by Markus Neteler; from sh to Python by Glynn Clements
.SH SOURCE CODE
.PP
Available at:
d.correlate source code
(history)
.PP
Accessed: Sunday Dec 17 17:22:49 2023
.PP
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.PP
© 2003\-2023
GRASS Development Team,
GRASS GIS 8.3.1 Reference Manual