1i.oif(1) Grass User's Manual i.oif(1)
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6 i.oif - Calculates Optimum-Index-Factor table for LANDSAT TM bands
7 1-5, & 7
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10 raster, imagery, statistics
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13 i.oif
14 i.oif help
15 i.oif image1=string image2=string image3=string image4=string
16 image5=string image7=string [--verbose] [--quiet]
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18 Parameters:
19 image1=string
20 LANDSAT TM band 1.
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22 image2=string
23 LANDSAT TM band 2.
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25 image3=string
26 LANDSAT TM band 3.
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28 image4=string
29 LANDSAT TM band 4.
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31 image5=string
32 LANDSAT TM band 5.
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34 image7=string
35 LANDSAT TM band 7.
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38 i.oif calculates the Optimum Index Factor for LANDSAT TM bands
39 1,2,3,4,5 and 7.
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41 The Optimum Index Factor is calculated to determine the band combina‐
42 tion which shows the maximum information when combined into a composite
43 image. The bands comprising the highest scoring combination from i.oif
44 are used as the three color channels required for d.rgb or r.composite.
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46 The analysis is saved to a file in the current directory called
47 "i.oif.result".
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50 Colour Composits in BGR order: important band combinations (example:
51 234 in BGR order means: B=2, G=3, R=4):
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53 123: near natural ("true") colour; however, because of
54 correlation of the 3 bands in visible spectrum, this com‐
55 bination contains not much more info than is contained in
56 single band.
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58 234: sensitive to green vegetation (portrayed as red),
59 coniferous as distinctly darker red than deciduous
60 forests. Roads and water bodies are clear.
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62 243: green vegetation is green but coniferous forests
63 aren't as clear as in the 234 combination
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65 247: one of the best for info pertaining to forestry.
66 Good for operation scale mapping of recent harvest areas
67 and road construction.
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69 345: contains one band from each of the main reflective
70 units (vis, nir, shortwave infra). Green vegetation is
71 green and the shortwave band shows vegetational stress
72 and mortality. Roads are less evident as band 3 is blue.
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74 347: similar to 345 but depicts burned areas better.
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76 354: appears more like a colour infrared photo.
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78 374: similar to 354.
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80 457: shows soil texture classes (clay, loam, sandy).
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83 Jensen, 1996. Introductory digital image processing, p.98. ISBN
84 0-13-205840-5
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87 d.rgb
88 r.composite
89 r.covar
90 r.univar
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93 Markus Neteler, ITC-Irst, Trento, Italy
94 Updated to GRASS 5.7 by Michael Barton, Arizona State University
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96 Last changed: $Date: 2007-11-13 12:09:02 +0100 (Tue, 13 Nov 2007) $
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98 Full index
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100 © 2003-2008 GRASS Development Team
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104GRASS 6.3.0 i.oif(1)