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<b>i.cca</b> is an image processing program that takes from two to eight
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(raster) band files and a signature file, and outputs the same number of
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raster band files transformed to provide maximum separability of the
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categories indicated by the signatures. This implementation of the
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canonical components transformation is based on the algorithm contained in
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the <a href="http://dbwww.essc.psu.edu/lasdoc/user/canal.html">LAS image
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processing system</a>. CCA is also known as "Canonical components
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Typically the user will use the
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<em><a href="g.gui.iclass.html">g.gui.iclass</a></em>
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program to collect a set of signatures and then pass those
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signatures along with the raster band files to
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<em>i.cca</em>. The raster band file names are specified
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on the command line by giving the group and subgroup that
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were used to collect the signatures.
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The output raster map names are built by appending a ".1",
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".2", etc. to the output raster map name specified on the
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<dt><b>group=</b><em>name</em>
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<dd>Name of the <a href="i.group.html">imagery</a> group
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to which the 2 to 8 raster band files used belong.
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<dt><b>subgroup=</b><em>name</em>
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<dd>Name of the <a href="i.group.html">imagery</a>
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subgroup to which the 2 to 8 raster band files used
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<dt><b>signature=</b><em>name</em>
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<dd>Name of an ASCII file containing spectral signatures.
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<dt><b>output=</b><em>name</em>
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<dd>Output raster map prefix name. The output raster map
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layer names are built by appending a ".1", ".2", etc. onto
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the <em>output</em> name specified by the user.
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<em>i.cca</em> respects the current geographic region definition
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and the current mask setting while performing the transformation.
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<a href="g.gui.iclass.html">g.gui.iclass</a>,
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<a href="i.pca.html">i.pca</a>,
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<a href="r.covar.html">r.covar</a>,
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<a href="r.mapcalc.html">r.mapcalc</a>
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Schowengerdt, Robert A. <b>Techniques for Image Processing and
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Classification in Remote Sensing</b>, Academic Press, 1983.
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David Satnik, GIS Laboratory,
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Central Washington University
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<p><i>Last changed: $Date: 2014-12-03 09:40:27 +0100 (Wed, 03 Dec 2014) $</i>