<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>GRASS GIS: i.cca</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <link rel="stylesheet" href="grassdocs.css" type="text/css"> </head> <body bgcolor="white"> <img src="grass_logo.png" alt="GRASS logo"><hr align=center size=6 noshade> <h2>NAME</h2> <em><b>i.cca</b></em> - Canonical components analysis (cca) program for image processing. <h2>KEYWORDS</h2> imagery <h2>SYNOPSIS</h2> <b>i.cca</b><br> <b>i.cca help</b><br> <b>i.cca</b> <b>group</b>=<em>name</em> <b>subgroup</b>=<em>name</em> <b>signature</b>=<em>string</em> <b>output</b>=<em>name</em> [--<b>overwrite</b>] [--<b>verbose</b>] [--<b>quiet</b>] <h3>Flags:</h3> <DL> <DT><b>--overwrite</b></DT> <DD>Allow output files to overwrite existing files</DD> <DT><b>--verbose</b></DT> <DD>Verbose module output</DD> <DT><b>--quiet</b></DT> <DD>Quiet module output</DD> </DL> <h3>Parameters:</h3> <DL> <DT><b>group</b>=<em>name</em></DT> <DD>Name of input imagery group</DD> <DT><b>subgroup</b>=<em>name</em></DT> <DD>Name of input imagery subgroup</DD> <DT><b>signature</b>=<em>string</em></DT> <DD>Ascii file containing spectral signatures</DD> <DT><b>output</b>=<em>name</em></DT> <DD>Output raster map prefix name</DD> </DL> <H2>DESCRIPTION</H2> <B>i.cca</B> 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 <a href=http://dbwww.essc.psu.edu/lasdoc/user/canal.html>LAS image processing system</a>. CCA is also known as "Canonical components transformation". <P> Typically the user will use the <EM><A HREF="i.class.html">i.class</A></EM> program to collect a set of signatures and then pass those signatures along with the raster band files to <EM>i.cca</EM>. The raster band file names are specified on the command line by giving the group and subgroup that were used to collect the signatures. <P> The output raster map names are built by appending a ".1", ".2", etc. to the output raster map name specified on the command line. <H3>Parameters:</H3> <DL> <DT><B>group=</B><EM>name</EM> <DD>Name of the <A HREF="i.group.html">imagery</A> group to which the 2 to 8 raster band files used belong. <DT><B>subgroup=</B><EM>name</EM> <DD>Name of the <A HREF="i.group.html">imagery</A> subgroup to which the 2 to 8 raster band files used belong. <DT><B>signature=</B><EM>name</EM> <DD>Name of an ASCII file containing spectral signatures. <DT><B>output=</B><EM>name</EM> <DD>Output raster map prefix name. The output raster map layer names are built by appending a ".1", ".2", etc. onto the <EM>output</EM> name specified by the user. </DL> <H2>NOTES</H2> <EM>i.cca</EM> respects the current geographic region definition and the current mask setting while performing the transformation. <H2>SEE ALSO</H2> Schowengerdt, Robert A. <B>Techniques for Image Processing and Classification in Remote Sensing</B>, Academic Press, 1983. <P> <EM><A HREF="i.class.html">i.class</A></EM><br> <EM><A HREF="i.pca.html">i.pca</A></EM><br> <EM><A HREF="r.covar.html">r.covar</A></EM><br> <EM><A HREF="r.mapcalc.html">r.mapcalc</A></EM> <H2>AUTHORS</H2> David Satnik, GIS Laboratory, Central Washington University <BR> Ali R. Vali, University of Texas <p><i>Last changed: $Date: 2006-12-13 15:21:43 +0100 (Wed, 13 Dec 2006) $</i> <HR> <P><a href="index.html">Main index</a> - <a href="imagery.html">imagery index</a> - <a href="full_index.html">Full index</a></P> <P>© 2003-2008 <a href="http://grass.osgeo.org">GRASS Development Team</a></p> </body> </html>
