Environmental Engineering Reference
In-Depth Information
Table 20.2 Multispectral indices related to leaf and canopy water content
Index
Abbreviation Equation a
Author
Comments
Normalized Difference
Vegetation Index
NDVI
( R 850 R 680 )/( R 850 + R 680 )
Rouse et al. ( 1974 ),
Tucker ( 1979 )
-
Normalized Difference
Infrared Index
NDII
( R 850 R 1650 )/( R 850 + R 1650 )
Hardisky et al.
( 1983 )
Also see Ji et al. ( 2011 )
log[1 ( R 850 R 1650 )]/
log[1 ( R 850 R 0 1650 )]
R 0 1650 is the reflectance at full turgor
(RWC ¼ 100%)
Leaf Water Stress Index LWSI
Hunt et al. ( 1987 )
Moisture Stress Index
MSI
R 1650 / R 850
Hunt and Rock
( 1989 )
Defined for Thematic Mapper Bands 5 and 4
Global Vegetation
Moisture Index
GVMI
[( R 850 + 0.1) ( R 1650 + 0.02)]/
[( R 850 + 0.1) + ( R 1650 + 0.02)]
Ceccato et al.
( 2002a , b )
See also Dasgupta and Qu ( 2009 )
Shortwave Infrared
Water Stress Index
(a) SIWSI
(6,2)
(a) ( R 1650 R 850 )/( R 1650 + R 850 )
Fensholt and
Sandholt ( 2003 )
(a) SIWSI (6,2)
¼
NDII
(b) SIWSI
(5,2)
(b) ( R 1240 R 850 )/( R 1240 + R 850 )
(b) SIWSI(5,2)
¼
NDWI
Normalized Difference
Water Index
NDWI
(R 850
R 1240 )/(R 850 +R 1240 )
Gao ( 1996 )
Designed for MODIS bands 2 and 5
Simple Ratio Water
Index
SRWI
R 850 / R 1240
Zarco-Tejada et al.
( 2003 )
-
Water Index
WI
R 900 / R 970
Pe˜uelas et al.
( 1993 , 1997 )
-
Maximum Difference
Water Index
MDWI
( R 1650 R 1500 )/( R 1650 + R 1500 )
Eitel et al. ( 2006 )
R 1650 and R 1500 are about the max and min R
between 1500 and 1750 nm
Shortwave Angle Slope
Index
SASI
( R 850 , R 1650 , R 2200 )
Khanna et al. ( 2007 ) Angle formed at R 1650 between R 850 and R 2200
Vegetation Water Stress
Index
VWSI
1
[( M 1 M )( R 850 M 2 R 1650 I 2 )/
( M 1 M 2 )( R 850 MR 1650 )]
[ I 2 ( M 1 M )+ I 1 ( M 2 M )]
Ghulam et al. ( 2008 ) M 1 , M 2 , I 1 , I 2 are points bounding a trapezoid in
NIR-SWIR image feature space
a
R λ is the reflectance at
λ
nanometers wavelength
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