g.gui.iclass(1grass) GRASS GIS User's Manual g.gui.iclass(1grass)
NAME
g.gui.iclass - Tool for supervised classification of imagery data.
Generates spectral signatures for an image by allowing the user to out-
line 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
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 signa-
tures. 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 in-
put 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 mul-
tiple training areas for multiple classes and calculate the spectral
signatures based on the cells that are within the training areas. Dur-
ing 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 signa-
ture.
The spectral signatures are composed of region means and covariance ma-
trices. 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 Repub-
lic
Vaclav Petras, Czech Technical University in Prague, Czech Republic
SOURCE CODE
Available at: wxGUI Supervised Classification Tool source code (his-
tory)
Accessed: unknown
Main index | GUI index | Topics index | Keywords index | Graphical in-
dex | Full index
© 2003-2022 GRASS Development Team, GRASS GIS 7.8.7 Reference Manual
GRASS 7.8.7 g.gui.iclass(1grass)
Generated by dwww version 1.14 on Sun Dec 29 18:23:48 CET 2024.