1g.gui.iclass(1)             GRASS GIS User's Manual            g.gui.iclass(1)
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NAME

6       g.gui.iclass  - Tool for supervised classification of imagery data.
7       Generates spectral signatures for an image by allowing the user to out‐
8       line regions of interest.
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KEYWORDS

11       general, GUI, classification, supervised classification, signatures
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SYNOPSIS

14       g.gui.iclass
15       g.gui.iclass --help
16       g.gui.iclass   [-m]    [group=name]     [subgroup=name]      [map=name]
17       [trainingmap=name]   [--help]  [--verbose]  [--quiet]  [--ui]
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19   Flags:
20       -m
21           Maximize window
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23       --help
24           Print usage summary
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26       --verbose
27           Verbose module output
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29       --quiet
30           Quiet module output
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32       --ui
33           Force launching GUI dialog
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35   Parameters:
36       group=name
37           Name of input imagery group
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39       subgroup=name
40           Name of input imagery subgroup
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42       map=name
43           Name of raster map to load
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45       trainingmap=name
46           Ground truth training map to load
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KEYWORDS

49       display, GUI, imagery, classification, supervised classification
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DESCRIPTION

52       Supervised  Classification  Tool  (wxIClass) is a wxGUI compoment which
53       allows the user to create training areas and generate  spectral  signa‐
54       tures.   The resulting signature file can be used as input for i.maxlik
55       or as a seed signature file for i.cluster.  WxIClass  can  be  launched
56       from  the Layer Manager menu Imagery → Classify image → Interactive
57       input  for  supervised  classification   or   via   command   line   as
58       g.gui.iclass.
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60       wxIClass currently allows you to:
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62           ·   create training areas (using customized vector digitizer)
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64           ·   show histograms for each band and class (category)
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66           ·   show coincidence plots for each band
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68           ·   show  raster cells that match training areas (within the number
69               of standard deviations specified)
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71           ·   specify color of class
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73           ·   write signature file
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75           ·   import vector map
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77           ·   export vector map with attribute table
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79       wxIClass performs the first pass in the GRASS two-pass supervised image
80       classification  process;  the GRASS module i.maxlik executes the second
81       pass.  Both programs must be run to generate a classified map in  GRASS
82       raster format.
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84       wxIClass  is an interactive program that allows the user to create mul‐
85       tiple training areas for multiple classes and  calculate  the  spectral
86       signatures based on the cells that are within the training areas.  Dur‐
87       ing this process the user will be shown histograms for each image band.
88       The  user  can  also  display  the  cells of the image bands which fall
89       within a user-specified number of standard deviations from the means in
90       the  spectral  signature.   By doing this, the user can see how much of
91       the image is likely to be put into the class associated with the signa‐
92       ture.
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94       The  spectral  signatures  are  composed of region means and covariance
95       matrices.  These region means and covariance matrices are used  in  the
96       second pass (i.maxlik) to classify the image.
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98       Alternatively,  the  spectral  signatures  generated by wxIClass can be
99       used for seed means for the clusters in i.cluster.
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SEE ALSO

102        wxGUI
103       wxGUI components, Interactive Scatter Plot Tool
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105       See also user wiki page and development page.
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AUTHOR

108       Anna Kratochvilova, Czech Technical University in Prague, Czech  Repub‐
109       lic
110       Vaclav Petras, Czech Technical University in Prague, Czech Republic
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SOURCE CODE

113       Available  at:  wxGUI  Supervised Classification Tool source code (his‐
114       tory)
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116       Main index | GUI index | Topics index  |  Keywords  index  |  Graphical
117       index | Full index
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119       © 2003-2020 GRASS Development Team, GRASS GIS 7.8.5 Reference Manual
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123GRASS 7.8.5                                                    g.gui.iclass(1)
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