bionic (1) wxGUI.iclass.1grass.gz

wxGUI Supervised Classification Tool

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