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NAME

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

KEYWORDS

       imagery, statistics, CCA, canonical components analysis

SYNOPSIS

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

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

       --help
           Print usage summary

       --verbose
           Verbose module output

       --quiet
           Quiet module output

       --ui
           Force launching GUI dialog

   Parameters:
       group=name [required]
           Name of input imagery group

       subgroup=name [required]
           Name of input imagery subgroup

       signature=name [required]
           File containing spectral signatures

       output=name [required]
           Output raster map prefix name

DESCRIPTION

       i.cca is an image processing program that takes any number of (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 g.gui.iclass 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 raster band files used belong.

       subgroup=name
           Name of the imagery subgroup to which the 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

        g.gui.iclass, i.pca, r.covar, r.mapcalc

REFERENCES

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

AUTHORS

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

       Last changed: $Date: 2017-02-16 13:48:50 +0100 (Thu, 16 Feb 2017) $

SOURCE CODE

       Available at: i.cca source code (history)

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       © 2003-2019 GRASS Development Team, GRASS GIS 7.6.1 Reference Manual