
NAME
d.correlate - Prints a graph of the correlation between data layers (in pairs).
KEYWORDS
display, diagram
SYNOPSIS
d.correlate
d.correlate help
d.correlate [-t] layer1=string layer2=string [layer3=string] [layer4=string] [--verbose] [--quiet]
Flags:
- -t
- Draw a trend line
- --verbose
- Verbose module output
- --quiet
- Quiet module output
Parameters:
- layer1=string
- raster input map
- layer2=string
- raster input map
- layer3=string
- raster input map
- layer4=string
- raster input map
DESCRIPTION
d.correlate is a shell (sh(1)) script that
graphically displays the results of an
r.stats
run on two raster map layers. This shell script is useful
for highlighting 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.
OPTIONS
Parameters:
- layer1 layer2 [layer3 [layer4]]
- The names of from two to four existing raster map layers
to be included in the correlation.
NOTES
This is a shell script that uses
r.stats
and the UNIX awk command
to calculate the correlation among data layers,
and uses
d.text and
d.graph to display the results.
If three or four map layers are specified, the correlation
among each combination of two data layers is displayed.
EXAMPLE
North Carolina sample dataset:
d.correlate -t layer1=lsat7_2002_10 layer2=lsat7_2002_20
FILES
This program is simply a shell script. Users are
encouraged to make their own shell script programs using
similar techniques. See $GISBASE/scripts/d.correlate.
SEE ALSO
d.text,
d.graph,
r.coin,
r.regression.line,
r.stats
AUTHOR
Michael Shapiro,
U.S.Army Construction Engineering
Research Laboratory
Rewritten to GRASS 6 (from csh to sh) by Markus Neteler
Trend line and model fix option added by Hamish Bowman
Last changed: $Date: 2010-06-08 16:58:08 -0700 (Tue, 08 Jun 2010) $
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