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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