1g.gui.iclass(1) GRASS GIS User's Manual g.gui.iclass(1)
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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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11 general, GUI, classification, supervised classification, signatures
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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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49 display, GUI, imagery, classification, supervised classification
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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 â Classify image â 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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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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108 Anna Kratochvilova, Czech Technical University in Prague, Czech Repub‐
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110 Vaclav Petras, Czech Technical University in Prague, Czech Republic
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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)