Prior to the launch of the INSAT-3D satellite in 2013, the test data was generated using in-house developed methodology to generate proxy radiances for both Imager and Sounder from hyperspectral observation available through polar-orbiting operational satellites, such as Metop-IASI, Aqua-AIRS, and simulated radiance using NWP model analysis as input to the radiative transfer models. However, for INSAT-3DR and 3DS the situation is easier as the actual observations from INSAT-3D Imager and Sounder could work as test data as the instrument characteristic are similar and the same will be applied as the day-1 algorithm.
The software tools that were developed for INSAT-3D will work for 3DR as well as 3DS with improved features based on past few years’ experience with INSAT-3D. These software tools are integrated with the INSAT Meteorological Data Processing System (IMDPS) installed at SAC, Ahmedabad (Bopal Campus) as well as IMD, New Delhi. The processed data is archived and disseminated through Meteorological and Oceanographic Satellite Data Archival Centre (MOSDAC) at SAC.