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 layer1=string layer2=string  [layer3=string]   [layer4=string]   [--verbose]  [--quiet]

   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.

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

       The UNIX awk command.

        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

       Last changed: $Date: 2011-11-08 03:29:50 -0800 (Tue, 08 Nov 2011) $

       Full index

       © 2003-2013 GRASS Development Team