1i.cca(1)                    GRASS GIS 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, statistics, CCA, canonical components analysis
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SYNOPSIS

13       i.cca
14       i.cca --help
15       i.cca group=name  subgroup=name  signature=name  output=name   [--over‐
16       write]  [--help]  [--verbose]  [--quiet]  [--ui]
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18   Flags:
19       --overwrite
20           Allow output files to overwrite existing files
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22       --help
23           Print usage summary
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25       --verbose
26           Verbose module output
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28       --quiet
29           Quiet module output
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31       --ui
32           Force launching GUI dialog
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34   Parameters:
35       group=name [required]
36           Name of input imagery group
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38       subgroup=name [required]
39           Name of input imagery subgroup
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41       signature=name [required]
42           File containing spectral signatures
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44       output=name [required]
45           Output raster map prefix name
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DESCRIPTION

48       i.cca  is an image processing program that takes any number of (raster)
49       band files and a signature file, and outputs the same number of  raster
50       band  files  transformed  to  provide maximum separability of the cate‐
51       gories indicated by the signatures.  This implementation of the canoni‐
52       cal  components  transformation  is based on the algorithm contained in
53       the LAS image processing system. CCA is also known as "Canonical compo‐
54       nents transformation".
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56       Typically  the  user will use the g.gui.iclass program to collect a set
57       of signatures and then pass those signatures along with the raster band
58       files  to  i.cca.  The raster band file names are specified on the com‐
59       mand line by giving the group and subgroup that were  used  to  collect
60       the signatures.
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62       The  output  raster map names are built by appending a ".1", ".2", etc.
63       to the output raster map name specified on the command line.
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65   Parameters:
66       group=name
67           Name of the imagery group to  which  the  raster  band  files  used
68           belong.
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70       subgroup=name
71           Name  of  the  imagery subgroup to which the raster band files used
72           belong.
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74       signature=name
75           Name of an ASCII file containing spectral signatures.
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77       output=name
78           Output raster map prefix name.  The output raster map  layer  names
79           are  built  by  appending  a  ".1", ".2", etc. onto the output name
80           specified by the user.
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NOTES

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

87        g.gui.iclass, i.pca, r.covar, r.mapcalc
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REFERENCES

90       Schowengerdt,  Robert A.  Techniques for Image Processing and Classifi‐
91       cation in Remote Sensing,  Academic Press, 1983.
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AUTHORS

94       David Satnik, GIS Laboratory, Central Washington University
95       Ali R. Vali, University of Texas
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SOURCE CODE

98       Available at: i.cca source code (history)
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100       Main index | Imagery index | Topics index | Keywords index |  Graphical
101       index | Full index
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103       © 2003-2020 GRASS Development Team, GRASS GIS 7.8.5 Reference Manual
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107GRASS 7.8.5                                                           i.cca(1)
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