Abstract
The present study investigates two natural sites for calibration of IRS sensors, one at Thar Desert, Rajasthan and another at Rann of Kutch, Gujarat, India. The variance analysis of satellite data of different seasons over these sites and atmospheric characterization were carried out. Results of the study suggest that the sites identified are suitable and can be used for vicarious calibration of satellite sensors during the months of October to March as during this period the atmospheric loading of aerosols, water vapour and ozone are at minimum. Thar desert and Rann of Kutch sites show spatial uniformity of within ~0.78–2.0 % and 1.96–3.90 % respectively. Error budget is also estimated. If well calibrated instruments are used, the overall error should not exceed ~2 % for the reflectance based approach.
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