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=string subgroup=string signature=string output=string
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17   Parameters:
18       group=string
19           Imagery files group
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21       subgroup=string
22           Imagery files subgroup
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24       signature=string
25           Ascii file containing spectral signatures
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27       output=string
28           Output raster file prefix name
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DESCRIPTION

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

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

70       Schowengerdt, Robert A.  Techniques for Image Processing and  Classifi‐
71       cation in Remote Sensing,  Academic Press, 1983.
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73       i.class
74       i.pca
75       r.covar
76       r.mapcalc
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AUTHORS

79       David Satnik, GIS Laboratory, Central Washington University
80       Ali R. Vali, University of Texas
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82       Last changed: $Date: 2003/04/17 14:48:15 $
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84       Full index
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88GRASS 6.2.2                                                           i.cca(1)