Ecoinformatics and Soil-Plant Formations - New Ecoinformatics Tools in Environmental Science: Applications and Decision-making - page 714

Table 8.17 (continued)
Vegetative
index

Description and model

SWVI Shortwave vegetation index. SWVI = (NIR − SWIR)/(NIR + SWIR) where

SWIR is the surface reflectance in short-wave infrared channel (1.65 ʼ m) of
the Spot that is sensitive to vegetatiov water content

EVI Enhanced vegetation index. EVI = 2(NIR − RED)/[(1 + L)

(NIR + C 1 RED − C 2 BLUE + L)] where C 1 ( ≈ 6) and C 2 ( ≈ 7.5) are empirical

correcting coef cients; RED and BLUE is surface re fl ectance in red

(0.620 − 0.670 ʼ m) and blue (0.459 − 0.479 ʼ m) range, respectively

DVI Difference vegetation index. DVI = NIR − RED

PVI Perpendicular vegetation index. PVI = NIR × sin ʱ -RED × cos ʱ where ʱ is the

angle between the soil line and the NIR axis

PRI Photochemical reflectance index. PRI is de ned by the following equation

using reflectance ( ρ ) at 531 and 570 nm wavelength: PRI = ( ρ 531 − ρ 570 )/
( ρ 531 + ρ 570 ) or PRI = ( ρ 570 − ρ 531 )/( ρ 531 + ρ 570 )

TVI Triangular vegetation index. TVI = 0.5[120( ρ − ρ 550 ) − 200( ρ − ρ 550)]

750 670

Transformed vegetation index.TVI = 0.5 + NDVI 1/2

TVI

Corrected transformed vegetation index. CTVI = (NDVI + 0.5)/|NDVI + 0.5| 3/2 CTVI

MTVI Modi ed triangular vegetation index. MTVI = [1.5(1.2 × (NIR − ρ Green ) − 2.5

(VIS − ρ Green )]/[(2NIR + 1) 2 − (6NIR − 5VIS 0.5 − 0.5] 0.5

MCARI Modi ed chlorophyll absorption in re fl ectance index.

MCARI = ρ 700 [( ρ − ρ 670 ) − 0.2( ρ − ρ 550 )]/ ρ 700 700 670

MNDWI Modified normalized difference water index. MNDWI = ( ρ − ρ SWR1 )/ Green

( ρ Green + ρ SWR1 ) where ρ Green and ρ SWR1 is surface re fl ectance value of Band2

(wavelength 0.52 − 0.60 ʼ m) and Band5 (wavelength 1.55 − 1.75 ʼ m) in the

Landsat-7 ETM + sensor, respectively

Land surface water index. LSWI = (NIR − ρ SWR1 )/(NIR − ρ SWR1 ) LSWI

to the ecosystem. In common, forest ecology mainly concentrates on the level of the
population, community or ecosystem. Present study of the forest ecosystems is
based on not only in-situ observations but the satellite measurements are used as
fundamental base for the forest ecology. In contrast to other land ecosystems,
forests have speci

c features that consist in the following circumstances:

trees can grow larger than other plant life-forms;

￿

there is the potential for a wide variety of forest structures;

￿

the in nite number of possible spatial arrangements of trees of varying size and

species makes for a highly intricate and diverse micro-environment in which
environmental variables such as solar radiation, temperature, relative humidity,
and wind speed can vary considerably over large and small distances;

￿

an important proportion of a forest ecosystem is biomass is often underground,

where soil structure, water quality and quantity, and levels of various soil
nutrients can vary greatly; and

'

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