i.cca(1grass) GRASS GIS User's Manual i.cca(1grass)
NAME
i.cca - Canonical components analysis (CCA) program for image process-
ing.
KEYWORDS
imagery, statistics, CCA, canonical components analysis
SYNOPSIS
i.cca
i.cca --help
i.cca group=name subgroup=name signature=name output=name [--over-
write] [--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 cate-
gories indicated by the signatures. This implementation of the canoni-
cal components transformation is based on the algorithm contained in
the LAS image processing system. CCA is also known as "Canonical compo-
nents 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 com-
mand 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 be-
long.
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 Classifi-
cation in Remote Sensing, Academic Press, 1983.
AUTHORS
David Satnik, GIS Laboratory, Central Washington University
Ali R. Vali, University of Texas
SOURCE CODE
Available at: i.cca source code (history)
Accessed: unknown
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