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Measurement of terrestrial and aerial solar spectral radiations in Antarctica for the vicarious calibration of the Resourcesat-1 AWiFS sensor

Terrestrial and aerial ground truth data collection with indigenously developed radiometers around Maitri, Antarctica was carried for the vicarious calibration of the Resourcesat-1 Advanced Wide Field Sensor (AWiFS). Measured and theoretically computed incoming solar spectral irradiance values match within ±3%. The AWiFS B2 image shows spatial non-uniformity of the test site of 2–4%. The variability of terrestrial solar spectral irradiance is within 3% for a duration of ±1.5 hours at the time of the satellite pass. On the basis of test results, it is concluded that Maitri, Antarctica is a potential test site for carrying out calibration/validation of optical sensors. AWiFS B2 pre-flight and estimated post-flight calibration coefficients are found to be within ±2%.