1wxGUI.iclass(1)             GRASS GIS User's Manual            wxGUI.iclass(1)
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wxGUI Supervised Classification Tool

KEYWORDS
7       display, GUI, imagery, classification, supervised classification
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DESCRIPTION
10       Supervised  Classification  Tool  (wxIClass) is a wxGUI compoment which
11       allows the user to create training areas and generate  spectral  signa‐
12       tures.   The resulting signature file can be used as input for i.maxlik
13       or as a seed signature file for i.cluster.  WxIClass  can  be  launched
14       from  the Layer Manager menu Imagery → Classify image → Interactive
15       input  for  supervised  classification   or   via   command   line   as
16       g.gui.iclass.
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18       wxIClass currently allows you to:
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20           •   create training areas (using customized vector digitizer)
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22           •   show histograms for each band and class (category)
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24           •   show coincidence plots for each band
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26           •   show  raster cells that match training areas (within the number
27               of standard deviations specified)
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29           •   specify color of class
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31           •   write signature file
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33           •   import vector map
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35           •   export vector map with attribute table
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37       wxIClass performs the first pass in the GRASS two-pass supervised image
38       classification  process;  the GRASS module i.maxlik executes the second
39       pass.  Both programs must be run to generate a classified map in  GRASS
40       raster format.
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42       wxIClass  is an interactive program that allows the user to create mul‐
43       tiple training areas for multiple classes and  calculate  the  spectral
44       signatures based on the cells that are within the training areas.  Dur‐
45       ing this process the user will be shown histograms for each image band.
46       The  user  can  also  display  the  cells of the image bands which fall
47       within a user-specified number of standard deviations from the means in
48       the  spectral  signature.   By doing this, the user can see how much of
49       the image is likely to be put into the class associated with the signa‐
50       ture.
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52       The spectral signatures are composed of region means and covariance ma‐
53       trices.  These region means and covariance matrices  are  used  in  the
54       second pass (i.maxlik) to classify the image.
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56       Alternatively,  the  spectral  signatures  generated by wxIClass can be
57       used for seed means for the clusters in i.cluster.
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SEE ALSO
60        wxGUI
61       wxGUI components, Interactive Scatter Plot Tool
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63       See also user wiki page and development page.
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AUTHORS
66       Anna Kratochvilova, Czech Technical University in Prague, Czech  Repub‐
67       lic
68       Vaclav Petras, Czech Technical University in Prague, Czech Republic
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SOURCE CODE
71       Available  at:  wxGUI  Supervised Classification Tool source code (his‐
72       tory)
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74       Accessed: Saturday Jan 21 21:17:59 2023
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76       Main index | GUI index | Topics index | Keywords index | Graphical  in‐
77       dex | Full index
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79       © 2003-2023 GRASS Development Team, GRASS GIS 8.2.1 Reference Manual
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83GRASS 8.2.1                                                    wxGUI.iclass(1)



        

    


            
        

        

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