Normalized Difference Vegetation Index (NDVI):

Normalized Difference Vegetation Index proposed
by Rouse et.al. (1973), NDVI is a measure of healthy, green vegetation. The
combination of its normalized difference formulation and use of the highest
absorption and reflectance regions of chlorophyll make it robust over a wide
range of conditions, the value of this index ranges from -1 to 1. The common
range for green vegetation is 0.2 to 0.8 8,

(1)
Where  is reflectance

Atmospherically
Resistant Vegetation Index (ARVI):

Main advantages of this index is its resistance
to atmospheric effects, as compared to the Normalized Difference Vegetation
Index which is accomplished by a self-adjustment procedure for the atmospheric
influence on the red band, using the difference in the radiance between the
blue and the red bands to correct the radiance in the red band. Simulations
using radiative transfer computations on arithmetic and natural surface
spectra, for numerous atmospheric conditions, show that ARVI has an analogous
dynamic range to the NDVI, but it is less sensitive to atmospheric effects than
the NDVI 9. The formula for ARVI for narrowband data is as given below.

ARVI: (?864 ? 2 × ?671 ? ?467)/(?864
+ 2 × ?671 ? ?467)
(2)

Red
Edge Normalized Difference Vegetation Index (RENDVI):

Red Edge Normalized Difference Vegetation Index: The reflectance near
700 nm has found to be very sensitive to red edge position as well as
chlorophyll concentration 10 RENDVI gives normalized value at the wavelength
of 752 nm and 701nm the equation for this Index is as given in equation (3).

RENDVI= (p752 ? p701)/(p752 + p701)             (3)

Modified
Red Edge Normalized Difference Vegetation Index (MRENDVI):

This
index is a modification of the Red
Edge NDVI that
corrects for leaf specular reflection. It capitalizes on the sensitivity of the
vegetation red edge to small changes in canopy foliage content, gap fraction,
and senescence. Applications include precision agriculture, forest monitoring,
and vegetation stress detection.

The value of this index ranges from -1 to
1. The common range for green vegetation is 0.2 to 0.7. See Narrowband
Definitions for the
allowable range of wavelengths 11, 12..

(4)

Normalized
Difference Infrared Index (NDII):

NDII is the
reflectance estimation that represents to changes in water substance of plant
canopy. It is not the simple ratio index it is normalized difference index. It
increases with increasing water contents in the canopy its range is -1 to 1,for
green vegetation it varies from 0.02 to 0.6 13, 14.  It is defined as follows:

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