NAME
i.cca - Canonical components analysis (cca)
program for image processing.
(GRASS Image Processsing Program)
SYNOPSIS
i.cca
i.cca help
i.cca
group=name
subgroup=name
signature=name
output=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.
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 file 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