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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: 2008-01-25 11:33:11 +0100 (Fri, 25 Jan 2008) $

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       © 2003-2010 GRASS Development Team