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   i.oif calculates the Optimum Index Factor for LANDSAT TM bands
   1,2,3,4,5 and 7.

   The Optimum Index Factor is calculated to determine the band
   combination which shows the maximum information when combined into a
   composite image. The bands comprising the highest scoring combination
   from i.oif are used as the three color channels required for [1]d.rgb
   or [2]r.composite.

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

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   Colour Composits in BGR order: important band combinations (example:
   234 in BGR order means: B=2, G=3, R=4):
     * 123: near natural ("true") colour; however, because of correlation
       of the 3 bands in visible spectrum, this combination contains not
       much more info than is contained in single band.
     * 234: sensitive to green vegetation (portrayed as red), coniferous
       as distinctly darker red than deciduous forests. Roads and water
       bodies are clear.
     * 243: green vegetation is green but coniferous forests aren't as
       clear as in the 234 combination
     * 247: one of the best for info pertaining to forestry. Good for
       operation scale mapping of recent harvest areas and road
       construction.
     * 345: contains one band from each of the main reflective units (vis,
       nir, shortwave infra). Green vegetation is green and the shortwave
       band shows vegetational stress and mortality. Roads are less
       evident as band 3 is blue.
     * 347: similar to 345 but depicts burned areas better.
     * 354: appears more like a colour infrared photo.
     * 374: similar to 354.
     * 457: shows soil texture classes (clay, loam, sandy).

ССЫÐÐÐ

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

СÐ. ТÐÐÐÐ

   [3]d.rgb
   [4]r.composite
   [5]r.covar
   [6]r.univar

ÐÐТÐÐ

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

   Last changed: $Date: 2007-11-13 05:09:02 -0600 (ÐÑ, 13 Ð½Ð¾Ñ 2007) $

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References

   1. file://localhost/root/tmp/2/fin/d.rgb.html
   2. file://localhost/root/tmp/2/fin/r.composite.html
   3. file://localhost/root/tmp/2/fin/d.rgb.html
   4. file://localhost/root/tmp/2/fin/r.composite.html
   5. file://localhost/root/tmp/2/fin/r.covar.html
   6. file://localhost/root/tmp/2/fin/r.univar.html