i.oif.1grass man page

i.oif — Calculates Optimum-Index-Factor table for spectral bands

Keywords

imagery, multispectral, statistics

Synopsis

i.oif
i.oif --help
i.oif [-gs] input=name[,name,...]  [output=name]   [--overwrite]  [--help]  [--verbose]  [--quiet]  [--ui]

Flags

-g

Print in shell script style

-s

Process bands serially (default: run in parallel)

--overwrite

Allow output files to overwrite existing files

--help

Print usage summary

--verbose

Verbose module output

--quiet

Quiet module output

--ui

Force launching GUI dialog

Parameters

input=name[,name,...] [required]

Name of input raster map(s)

output=name

Name for output file (if omitted or "-" output to stdout)

Description

i.oif calculates the Optimum Index Factor for multi-spectral satellite imagery.

The Optimum Index Factor (OIF) determines the three-band combination that maximizes the variability (information) in a multi-spectral scene. The index is a ratio of the total variance (standard deviation) within and the correlation between all possible band combinations. The bands that comprise the highest scoring combination from i.oif are used as the three color channels required for d.rgb or r.composite.

The analysis is saved to a file in the current directory called "i.oif.result".

Notes

Landsat 1-7 TM: Colour Composites in BGR order as important Landsat TM band combinations (example: 234 in BGR order means: B=2, G=3, R=4):

By default the module will calculate standard deviations for all bands in parallel. To run serially use the -s flag. If the WORKERS environment variable is set, the number of concurrent processes will be limited to that number of jobs.

Example

North Carolina sample dataset:

g.region raster=lsat7_2002_10 -p
i.oif input=lsat7_2002_10,lsat7_2002_20,lsat7_2002_30,lsat7_2002_40,lsat7_2002_50,lsat7_2002_70

References

Jensen, 1996. Introductory digital image processing. Prentice Hall, p.98. ISBN 0-13-205840-5

See Also

d.rgb, r.composite, r.covar, r.univar

Authors

Markus Neteler, ITC-Irst, Trento, Italy
Updated to GRASS 5.7 by Michael Barton, Arizona State University

Last changed: $Date: 2015-07-20 10:45:41 +0200 (Mon, 20 Jul 2015) $

Source Code

Available at: i.oif source code (history)

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© 2003-2017 GRASS Development Team, GRASS GIS 7.2.1 Reference Manual

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