1i.cca(1)                      Grass User's Manual                     i.cca(1)
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NAME

6       i.cca  - Canonical components analysis (cca) program for image process‐
7       ing.
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KEYWORDS

10       imagery
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SYNOPSIS

13       i.cca
14       i.cca help
15       i.cca group=name subgroup=name signature=string  output=name   [--over‐
16       write]  [--verbose]  [--quiet]
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18   Flags:
19       --overwrite
20           Allow output files to overwrite existing files
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22       --verbose
23           Verbose module output
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25       --quiet
26           Quiet module output
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28   Parameters:
29       group=name
30           Name of input imagery group
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32       subgroup=name
33           Name of input imagery subgroup
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35       signature=string
36           Ascii file containing spectral signatures
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38       output=name
39           Output raster map prefix name
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DESCRIPTION

42       i.cca  is  an  image  processing  program  that takes from two to eight
43       (raster) band files and a signature file, and outputs the  same  number
44       of raster band files transformed to provide maximum separability of the
45       categories indicated by the signatures.   This  implementation  of  the
46       canonical components transformation is based on the algorithm contained
47       in the LAS image processing system. CCA is  also  known  as  "Canonical
48       components transformation".
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50       Typically  the  user  will  use the i.class program to collect a set of
51       signatures and then pass those signatures along with  the  raster  band
52       files  to  i.cca.  The raster band file names are specified on the com‐
53       mand line by giving the group and subgroup that were  used  to  collect
54       the signatures.
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56       The  output  raster map names are built by appending a ".1", ".2", etc.
57       to the output raster map name specified on the command line.
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59   Parameters:
60       group=name
61              Name of the imagery group to which the 2 to 8 raster band  files
62              used belong.
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64       subgroup=name
65              Name  of  the  imagery  subgroup to which the 2 to 8 raster band
66              files used belong.
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68       signature=name
69              Name of an ASCII file containing spectral signatures.
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71       output=name
72              Output raster map prefix name.   The  output  raster  map  layer
73              names  are built by appending a ".1", ".2", etc. onto the output
74              name specified by the user.
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NOTES

77       i.cca respects the current geographic region definition and the current
78       mask setting while performing the transformation.
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SEE ALSO

81       Schowengerdt,  Robert A.  Techniques for Image Processing and Classifi‐
82       cation in Remote Sensing,  Academic Press, 1983.
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84       i.class
85       i.pca
86       r.covar
87       r.mapcalc
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AUTHORS

90       David Satnik, GIS Laboratory, Central Washington University
91       Ali R. Vali, University of Texas
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93       Last changed: $Date: 2006-12-13 15:21:43 +0100 (Wed, 13 Dec 2006) $
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95       Full index
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97       © 2003-2008 GRASS Development Team
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101GRASS 6.3.0                                                           i.cca(1)