NAME

       i.cca  - Canonical components analysis (cca) program for image processing.

KEYWORDS

       imagery, statistics

SYNOPSIS

       i.cca
       i.cca help
       i.cca  group=name  subgroup=name  signature=string output=name  [--overwrite]  [--verbose]
       [--quiet]

   Flags:
       --overwrite
           Allow output files to overwrite existing files

       --verbose
           Verbose module output

       --quiet
           Quiet module output

   Parameters:
       group=name
           Name of input imagery group

       subgroup=name
           Name of input imagery subgroup

       signature=string
           File containing spectral signatures

       output=name
           Output raster map prefix name

DESCRIPTION

       i.cca is an image processing program that takes from two to eight (raster) band files  and
       a  signature file, and outputs the same number of raster band files transformed to provide
       maximum separability of the categories indicated by the signatures.   This  implementation
       of  the canonical components transformation is based on the algorithm contained in the LAS
       image processing system. CCA is also known as "Canonical components transformation".

       Typically the user will use the i.class program to collect a set of  signatures  and  then
       pass  those  signatures  along  with the raster band files to i.cca.  The raster band file
       names are specified on the command line by giving the group and subgroup that were used to
       collect the signatures.

       The output raster map names are built by appending a ".1", ".2", etc. to the output raster
       map name specified on the command line.

   Parameters:
       group=name
              Name of the imagery group to which the 2 to 8 raster band files used belong.

       subgroup=name
              Name of the imagery subgroup to which the 2 to 8 raster band files used belong.

       signature=name
              Name of an ASCII file containing spectral signatures.

       output=name
              Output raster map prefix name.  The output raster map  layer  names  are  built  by
              appending a ".1", ".2", etc. onto the output name specified by the user.

NOTES

       i.cca respects the current geographic region definition and the current mask setting while
       performing the transformation.

SEE ALSO

       Schowengerdt, Robert A.  Techniques for Image  Processing  and  Classification  in  Remote
       Sensing,  Academic Press, 1983.

       i.class
       i.pca
       r.covar
       r.mapcalc

AUTHORS

       David Satnik, GIS Laboratory, Central Washington University
       Ali R. Vali, University of Texas

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

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       © 2003-2013 GRASS Development Team