bionic (1) g.gui.iclass.1grass.gz

NAME

       g.gui.iclass  - Tool for supervised classification of imagery data.
       Generates spectral signatures for an image by allowing the user to outline regions of interest.

KEYWORDS

       general, GUI, classification, supervised classification, signatures

SYNOPSIS

       g.gui.iclass
       g.gui.iclass --help
       g.gui.iclass   [-m]    [group=name]     [subgroup=name]     [map=name]     [trainingmap=name]    [--help]
       [--verbose]  [--quiet]  [--ui]

   Flags:
       -m
           Maximize window

       --help
           Print usage summary

       --verbose
           Verbose module output

       --quiet
           Quiet module output

       --ui
           Force launching GUI dialog

   Parameters:
       group=name
           Name of input imagery group

       subgroup=name
           Name of input imagery subgroup

       map=name
           Name of raster map to load

       trainingmap=name
           Ground truth training map to load

DESCRIPTION

       Supervised Classification Tool (wxIClass) is a wxGUI compoment which allows the user to  create  training
       areas  and  generate spectral signatures.  The resulting signature file can be used as input for i.maxlik
       or as a seed signature file for i.cluster.  WxIClass can be launched from the Layer Manager menu  Imagery
       →  Classify  image  →  Interactive input for supervised classification or via command line as
       g.gui.iclass.

       wxIClass currently allows you to:

           •   create training areas (using customized vector digitizer)

           •   show histograms for each band and class (category)

           •   show coincidence plots for each band

           •   show raster cells that match training areas (within the number of standard deviations specified)

           •   specify color of class

           •   write signature file

           •   import vector map

           •   export vector map with attribute table

       wxIClass performs the first pass in the GRASS two-pass supervised image classification process; the GRASS
       module  i.maxlik  executes  the  second  pass.  Both programs must be run to generate a classified map in
       GRASS raster format.

       wxIClass is an interactive program that allows the user to create multiple training  areas  for  multiple
       classes  and  calculate  the  spectral  signatures based on the cells that are within the training areas.
       During this process the user will be shown histograms for each image band.  The user can also display the
       cells  of the image bands which fall within a user-specified number of standard deviations from the means
       in the spectral signature.  By doing this, the user can see how much of the image is  likely  to  be  put
       into the class associated with the signature.

       The  spectral  signatures  are  composed of region means and covariance matrices.  These region means and
       covariance matrices are used in the second pass (i.maxlik) to classify the image.

       Alternatively, the spectral signatures generated by wxIClass can be used for seed means for the  clusters
       in i.cluster.

SEE ALSO

        wxGUI
       wxGUI components, Interactive Scatter Plot Tool

       See also user wiki page and development page.

AUTHOR

       Anna Kratochvilova, Czech Technical University in Prague, Czech Republic
       Vaclav Petras, Czech Technical University in Prague, Czech Republic

       $Date: 2014-04-20 15:20:39 +0200 (Sun, 20 Apr 2014) $

SOURCE CODE

       Available at: wxGUI Supervised Classification Tool source code (history)

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       © 2003-2018 GRASS Development Team, GRASS GIS 7.4.0 Reference Manual