Abstract
In this study, an attempt has been made to determine the Surface Temperature (ST) with a split window algorithm accounting for the differential absorption effects of the atmosphere. The data from AVHRR (Advanced Very High Resolution Radiometer) sensor onboard NOAA polar orbiting meteorological satellites was used. The dynamic response of surface temperature, over an extensively wheat growing tract of India during different phenological stages of the crop, in relation to the Normalized Difference Vegetation Index (NDVI) was studied. A good agreement was obtained between the exponentially fitted (to soil temperatures at three different depths recorded at the meteorological observatories) surface temperatures (hereafter labelled as computed) and the satellite retrieved surface temperatures. Also a strong negative dynamic correlation was observed between the NDVI and the retrieved surface temperature. The results were explained based on the phenology of the wheat crop, land area under agriculture and vegetation. The study has shown the utility of NDVI as a modulating parameter, for accounting emissivity variation, in the estimation of the surface temperature.
Published Version
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