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

GRASS 6.4.3                                                                                        i.cca(1grass)