1i.cca(1) GRASS GIS User's Manual i.cca(1)
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6 i.cca - Canonical components analysis (CCA) program for image process‐
7 ing.
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10 imagery, statistics, CCA, canonical components analysis
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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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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 be‐
68 long.
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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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83 i.cca respects the current geographic region definition and the current
84 mask setting while performing the transformation.
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87 Schowengerdt, Robert A. Techniques for Image Processing and Classifi‐
88 cation in Remote Sensing, Academic Press, 1983.
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91 g.gui.iclass, i.gensig, i.cluster, i.pca, r.covar, r.mapcalc
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94 David Satnik, GIS Laboratory, Central Washington University
95 Ali R. Vali, University of Texas
96 Semantic label support: Maris Nartiss, University of Latvia
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99 Available at: i.cca source code (history)
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101 Accessed: Saturday Oct 28 18:18:59 2023
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103 Main index | Imagery index | Topics index | Keywords index | Graphical
104 index | Full index
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106 © 2003-2023 GRASS Development Team, GRASS GIS 8.3.1 Reference Manual
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110GRASS 8.3.1 i.cca(1)