Sensitivity Of Normalized Difference Vegetation Index (ndvi) Estimation To Various Atmospheric Variables

A vegetation and atmospheric radiative method is employed to study different atmosphericrnparameter effect on vegetation index. Spectral and angular distribution ofrnsurface reflectance at different altitude of the atmosphere were simulated for differentrnsolar zenith angle. Sensitivity of normalized difference vegetation index (NDVI) tornaerosol loading, cirrus cover, air mass and bidirectional reflectance distribution functionrn(BRDF) has been studied. The result of the simulation for selected surface typesrnhave shown that NDVI increases with solar zenith angle irrespective of land surfacerntypes. More over our analysis reveals that sensitivity of NDVI to aerosol is highlyrnpronounced for all surface types. The results are consistent with the expected physicsrnof radiative transfer theory

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