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 12:29:50 +0100 (Tue, 08 Nov 2011) $
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