Assessment of Resourcesat-2A Liss-3 Radiometric Calibration Accuracy with Near Simultaneous Prisma Data Over Niger-2

Pseudo Invariant Calibration sites (PICS) are the targets on the Earth’s surface with very less or almost nil variation in terms of spatial, spectral response with time. Mostly these sites are desert sites located in arid regions, where the average annual precipitation is very low. Due to this inherent advantage, these sites are employed for Earth Observation (EO) satellite sensor stability studies. In the present study, Niger-2, a PIC site in Saharan desert is used to assess the radiometric calibration of Resourcesat-2A (RS2A) LISS-3 data product with near simultaneous Hyperspectral Precursor of the Application Mission (PRISMA) data coverage as reference. The mean calibration ratio for RS2A LISS-3 bands B2, B3, B4, B5 is 0.96, 0.91, 0.97, 0.97 respectively. The ratios indicate the calibration coefficients of the LISS-3 sensor holds good for time series analysis. The activity is the outcome of the HYP_11 PICS project in the framework of the Italian Space Agency (ASI) and the Indian Space Research Organisation (ISRO) Earth Observation Working Group. PRISMA data were provided by ASI.