wxGUI Supervised Classification Tool

KEYWORDS

       display, GUI, imagery, classification, supervised classification

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

SOURCE CODE

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

       Main index | GUI index | Topics index | Keywords index | Graphical index | Full index

       © 2003-2019 GRASS Development Team, GRASS GIS 7.8.2 Reference Manual