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@@ -1,168 +1,168 @@
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-<H2>DESCRIPTION</H2>
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-
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-<EM>i.vi</EM> calculates vegetation indices based on biophysical
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-parameters.
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-
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-<ul>
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- <li>ARVI: atmospherically resistant vegetation indices</li>
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- <li>DVI: Difference Vegetation Index</li>
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- <li>EVI: Enhanced Vegetation Index</li>
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- <li>GARI: Green atmospherically resistant vegetation index</li>
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- <li>GEMI: Global Environmental Monitoring Index</li>
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- <li>GVI: Green Vegetation Index</li>
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- <li>IPVI: Infrared Percentage Vegetation Index</li>
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- <li>MSAVI2: second Modified Soil Adjusted Vegetation Index</li>
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- <li>MSAVI: Modified Soil Adjusted Vegetation Index</li>
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- <li>NDVI: Normalized Difference Vegetation Index</li>
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- <li>PVI: Perpendicular Vegetation Index</li>
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- <li>RVI: ratio vegetation index</li>
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- <li>SAVI: Soil Adjusted Vegetation Index</li>
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- <li>SR: Simple Vegetation ratio</li>
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- <li>WDVI: Weighted Difference Vegetation Index</li>
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-</ul>
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-
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-<pre>
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-ARVI: Atmospheric Resistant Vegetation Index
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-ARVI is resistant to atmospheric effects (in comparison to
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-the NDVI) and is accomplished by a self correcting process
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-for the atmospheric effect in the red channel, using the
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-difference in the radiance between the blue and the red
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-channels.(Kaufman and Tanre 1996).
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-ARVI = (nirchan - (2.0*redchan - bluechan)) /
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-( nirchan + (2.0*redchan - bluechan))
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-arvi( redchan, nirchan, bluechan )
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-</pre>
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-
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-<pre>
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-DVI: Difference Vegetation Index
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-DVI = ( nirchan - redchan )
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-dvi( redchan, nirchan )
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-</pre>
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-
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-<pre>
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-EVI: Enhanced Vegetation Index
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-Huete A.R., Liu H.Q., Batchily K., vanLeeuwen W. (1997).
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-A comparison of vegetation indices global set of TM images for
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-EOS-MODIS. Remote Sensing of Environment, 59:440-451.
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-EVI = 2.5 * ( nirchan - redchan ) /
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-( nirchan + 6.0 * redchan - 7.5 * bluechan + 1.0 )
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-evi( bluechan, redchan, nirchan )
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-</pre>
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-
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-<pre>
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-GARI: green atmospherically resistant vegetation index
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-GARI = ( nirchan - (greenchan-(bluechan - redchan))) /
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-( nirchan- (greenchan-(bluechan - redchan)))
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-gari( redchan, nirchan, bluechan, greenchan )
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-</pre>
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-
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-<pre>
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-GEMI: Global Environmental Monitoring Index
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-GEMI = (( (2*((nirchan * nirchan)-(redchan * redchan))+
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-1.5*nirchan+0.5*redchan) / (nirchan + redchan + 0.5)) *
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-(1 - 0.25 * (2*((nirchan * nirchan)-(redchan * redchan))
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-+1.5*nirchan+0.5*redchan) /(nirchan + redchan + 0.5)))-
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-( (redchan - 0.125) / (1 - redchan))
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-gemi( redchan, nirchan )
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-</pre>
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-
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-<pre>
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-GVI: Green Vegetation Index
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-GVI = ( -0.2848 * bluechan - 0.2435 * greenchan -
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-0.5436 * redchan + 0.7243 * nirchan + 0.0840 * chan5chan-
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-0.1800 * chan7chan)
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-gvi( bluechan, greenchan, redchan, nirchan, chan5chan, chan7chan)
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-</pre>
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-
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-<pre>
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-IPVI: Infrared Percentage Vegetation Index
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-IPVI = nirchan/(nirchan+redchan)
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-ipvi( redchan, nirchan )
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-</pre>
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-
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-<pre>
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-MSAVI2: second Modified Soil Adjusted Vegetation Index
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-MSAVI2 = (1/2)*(2(NIR+1)-sqrt((2*NIR+1)^2-8(NIR-red)))
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-msavi2( redchan, nirchan )
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-</pre>
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-
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-<pre>
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-MSAVI: Modified Soil Adjusted Vegetation Index
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-MSAVI = s(NIR-s*red-a) / (a*NIR+red-a*s+X*(1+s*s))
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-where a is the soil line intercept, s is the
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-soil line slope, and X is an adjustment factor
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-which is set to minimize soil noise (0.08 in
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-original papers).
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-msavi( redchan, nirchan )
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-</pre>
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-
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-<pre>
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-NDVI: Normalized Difference Vegetation Index
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-Data Type Band Numbers ([IR, Red])
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-TM Bands= [4,3]
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-MSS Bands = [7, 5]
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-AVHRR Bands = [2, 1]
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-SPOT XS Bands = [3, 2]
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-AVIRIS Bands = [51, 29]
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-
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-
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-(AVHRR) NDVI = (channel 2 - channel 1) / (channel 2 + channel 1)
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-</pre>
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-
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-<pre>
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-PVI: Perpendicular Vegetation Index
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-PVI = sin(a)NIR-cos(a)red
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-for a isovegetation lines (lines of equal vegetation)
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-would all be parallel to the soil line therefore a=1
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-pvi( redchan, nirchan )
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-</pre>
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-
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-<pre>
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-SAVI: Soil Adjusted Vegetation Index
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-SAVI = ((1.0+0.5)*(nirchan - redchan)) / (nirchan + redchan +0.5)
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-savi( redchan, nirchan )
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-</pre>
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-
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-<pre>
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-SR: Simple Vegetation ratio
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-SR = (nirchan/redchan)
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-sr( redchan, nirchan )
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-</pre>
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-
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-<pre>
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-WDVI: Weighted Difference Vegetation Index
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-WDVI = nirchan - a * redchan
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-if(soil_weight_line == None):
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-a = 1.0 #slope of soil line
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-wdvi( redchan, nirchan, soil_line_weight )
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-</pre>
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-
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-<H2>NOTES</H2>
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-
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-<pre>
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-Originally from kepler.gps.caltech.edu
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-A FAQ on Vegetation in Remote Sensing
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-Written by Terrill W. Ray
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- Div. of Geological and Planetary Sciences
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- California Institute of Technology
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-email: terrill@mars1.gps.caltech.edu
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-Snail Mail: Terrill Ray
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- Division of Geological and Planetary Sciences
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- Caltech
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- Mail Code 170-25
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- Pasadena, CA 91125
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-</pre>
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-
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-<H2>SEE ALSO</H2>
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-
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-<em>
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- <a href="i.albedo.html">i.albedo</a>
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-</em>
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-
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-
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-<H2>AUTHORS</H2>
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-Baburao Kamble, Asian Institute of Technology, Thailand<br>
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-Yann Chemin, Asian Institute of Technology, Thailand<br>
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-
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-<p>
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-<i>Last changed: $Date: 2006/10/09 21:30:42 $</i>
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+<H2>DESCRIPTION</H2>
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+
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+<EM>i.vi</EM> calculates vegetation indices based on biophysical
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|
|
+parameters.
|
|
|
+
|
|
|
+<ul>
|
|
|
+ <li>ARVI: atmospherically resistant vegetation indices</li>
|
|
|
+ <li>DVI: Difference Vegetation Index</li>
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|
+ <li>EVI: Enhanced Vegetation Index</li>
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+ <li>GARI: Green atmospherically resistant vegetation index</li>
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+ <li>GEMI: Global Environmental Monitoring Index</li>
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+ <li>GVI: Green Vegetation Index</li>
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+ <li>IPVI: Infrared Percentage Vegetation Index</li>
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+ <li>MSAVI2: second Modified Soil Adjusted Vegetation Index</li>
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+ <li>MSAVI: Modified Soil Adjusted Vegetation Index</li>
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+ <li>NDVI: Normalized Difference Vegetation Index</li>
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+ <li>PVI: Perpendicular Vegetation Index</li>
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+ <li>RVI: ratio vegetation index</li>
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+ <li>SAVI: Soil Adjusted Vegetation Index</li>
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+ <li>SR: Simple Vegetation ratio</li>
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+ <li>WDVI: Weighted Difference Vegetation Index</li>
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+</ul>
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+
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+<pre>
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+ARVI: Atmospheric Resistant Vegetation Index
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+ARVI is resistant to atmospheric effects (in comparison to
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+the NDVI) and is accomplished by a self correcting process
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|
+for the atmospheric effect in the red channel, using the
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+difference in the radiance between the blue and the red
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+channels.(Kaufman and Tanre 1996).
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+ARVI = (nirchan - (2.0*redchan - bluechan)) /
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+( nirchan + (2.0*redchan - bluechan))
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+arvi( redchan, nirchan, bluechan )
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+</pre>
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+
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+<pre>
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+DVI: Difference Vegetation Index
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+DVI = ( nirchan - redchan )
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+dvi( redchan, nirchan )
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+</pre>
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+
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+<pre>
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+EVI: Enhanced Vegetation Index
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+Huete A.R., Liu H.Q., Batchily K., vanLeeuwen W. (1997).
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+A comparison of vegetation indices global set of TM images for
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+EOS-MODIS. Remote Sensing of Environment, 59:440-451.
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+EVI = 2.5 * ( nirchan - redchan ) /
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+( nirchan + 6.0 * redchan - 7.5 * bluechan + 1.0 )
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+evi( bluechan, redchan, nirchan )
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+</pre>
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+
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+<pre>
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+GARI: green atmospherically resistant vegetation index
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+GARI = ( nirchan - (greenchan-(bluechan - redchan))) /
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+( nirchan- (greenchan-(bluechan - redchan)))
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+gari( redchan, nirchan, bluechan, greenchan )
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+</pre>
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+
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+<pre>
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+GEMI: Global Environmental Monitoring Index
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+GEMI = (( (2*((nirchan * nirchan)-(redchan * redchan))+
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+1.5*nirchan+0.5*redchan) / (nirchan + redchan + 0.5)) *
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+(1 - 0.25 * (2*((nirchan * nirchan)-(redchan * redchan))
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++1.5*nirchan+0.5*redchan) /(nirchan + redchan + 0.5)))-
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+( (redchan - 0.125) / (1 - redchan))
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+gemi( redchan, nirchan )
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+</pre>
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+
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+<pre>
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+GVI: Green Vegetation Index
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+GVI = ( -0.2848 * bluechan - 0.2435 * greenchan -
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+0.5436 * redchan + 0.7243 * nirchan + 0.0840 * chan5chan-
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+0.1800 * chan7chan)
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+gvi( bluechan, greenchan, redchan, nirchan, chan5chan, chan7chan)
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+</pre>
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+
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+<pre>
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+IPVI: Infrared Percentage Vegetation Index
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+IPVI = nirchan/(nirchan+redchan)
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+ipvi( redchan, nirchan )
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+</pre>
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+
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+<pre>
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+MSAVI2: second Modified Soil Adjusted Vegetation Index
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+MSAVI2 = (1/2)*(2(NIR+1)-sqrt((2*NIR+1)^2-8(NIR-red)))
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+msavi2( redchan, nirchan )
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+</pre>
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+
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+<pre>
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+MSAVI: Modified Soil Adjusted Vegetation Index
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+MSAVI = s(NIR-s*red-a) / (a*NIR+red-a*s+X*(1+s*s))
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+where a is the soil line intercept, s is the
|
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|
+soil line slope, and X is an adjustment factor
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+which is set to minimize soil noise (0.08 in
|
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+original papers).
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+msavi( redchan, nirchan )
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+</pre>
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+
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+<pre>
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+NDVI: Normalized Difference Vegetation Index
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+Data Type Band Numbers ([IR, Red])
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+TM Bands= [4,3]
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+MSS Bands = [7, 5]
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+AVHRR Bands = [2, 1]
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+SPOT XS Bands = [3, 2]
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+AVIRIS Bands = [51, 29]
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+
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+
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+(AVHRR) NDVI = (channel 2 - channel 1) / (channel 2 + channel 1)
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+</pre>
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+
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+<pre>
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+PVI: Perpendicular Vegetation Index
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+PVI = sin(a)NIR-cos(a)red
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+for a isovegetation lines (lines of equal vegetation)
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+would all be parallel to the soil line therefore a=1
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+pvi( redchan, nirchan )
|
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|
+</pre>
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+
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+<pre>
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+SAVI: Soil Adjusted Vegetation Index
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+SAVI = ((1.0+0.5)*(nirchan - redchan)) / (nirchan + redchan +0.5)
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+savi( redchan, nirchan )
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+</pre>
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+
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+<pre>
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+SR: Simple Vegetation ratio
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+SR = (nirchan/redchan)
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+sr( redchan, nirchan )
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+</pre>
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+
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+<pre>
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+WDVI: Weighted Difference Vegetation Index
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+WDVI = nirchan - a * redchan
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+if(soil_weight_line == None):
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+a = 1.0 #slope of soil line
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+wdvi( redchan, nirchan, soil_line_weight )
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+</pre>
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+
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+<H2>NOTES</H2>
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+
|
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|
+<pre>
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|
+Originally from kepler.gps.caltech.edu
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+A FAQ on Vegetation in Remote Sensing
|
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|
+Written by Terrill W. Ray
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+ Div. of Geological and Planetary Sciences
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+ California Institute of Technology
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+email: terrill@mars1.gps.caltech.edu
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+Snail Mail: Terrill Ray
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+ Division of Geological and Planetary Sciences
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+ Caltech
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+ Mail Code 170-25
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+ Pasadena, CA 91125
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+</pre>
|
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+
|
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|
+<H2>SEE ALSO</H2>
|
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|
+
|
|
|
+<em>
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+ <a href="i.albedo.html">i.albedo</a>
|
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+</em>
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+
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+
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+<H2>AUTHORS</H2>
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+Baburao Kamble, Asian Institute of Technology, Thailand<br>
|
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+Yann Chemin, Asian Institute of Technology, Thailand<br>
|
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+
|
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+<p>
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+<i>Last changed: $Date: 2006/10/09 21:30:42 $</i>
|