Sensitivity of Normalized difference Vegetation index (NDVI) Estimation to various Atmospheric variables
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Date
2007-07
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Addis Ababa University
Abstract
A vegetation and atmospheric radiative method is employed to study different atmospheric
parameter effect on vegetation index. Spectral and angular distribution of
surface reflectance at different altitude of the atmosphere were simulated for different
solar zenith angle. Sensitivity of normalized difference vegetation index (NDVI) to
aerosol loading, cirrus cover, air mass and bidirectional reflectance distribution function
(BRDF) has been studied. The result of the simulation for selected surface types
have shown that NDVI increases with solar zenith angle irrespective of land surface
types. More over our analysis reveals that sensitivity of NDVI to aerosol is highly
pronounced for all surface types. The results are consistent with the expected physics
of radiative transfer theory
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Keywords
Estimation to various Atmospheric variables