Abstract
Radiometric calibration coefficients for the VIIRS (Visible Infrared Imaging Radiometer Suite) reflective solar bands have been reprocessed from the beginning of the Suomi NPP (National Polar-orbiting Partnership) mission until present. An automated calibration procedure, implemented in the NOAA (National Oceanic and Atmospheric Administration) JPSS (Joint Polar Satellite System) operational data production system, was applied to reprocess onboard solar calibration data and solar diffuser degradation measurements. The latest processing parameters from the operational system were used to include corrected solar vectors, optimized directional dependence of attenuation screens transmittance and solar diffuser reflectance, updated prelaunch calibration coefficients without an offset term, and optimized Robust Holt-Winters filter parameters. The parameters were consistently used to generate a complete set of the radiometric calibration coefficients for the entire duration of the Suomi NPP mission. The reprocessing has demonstrated that the automated calibration procedure can be successfully applied to all solar measurements acquired from the beginning of the mission until the full deployment of the automated procedure in the operational processing system. The reprocessed calibration coefficients can be further used to reprocess VIIRS SDR (Sensor Data Record) and other data products. The reprocessing has also demonstrated how the automated calibration procedure can be used during activation of the VIIRS instruments on the future JPSS satellites.
Highlights
VIIRS (Visible Infrared Imaging Radiometer Suite) instrument has been operating onboard the Suomi NPP (National Polar-orbiting Partnership) satellite since November 2011 [1]
Suomi NPP VIIRS is the first instrument in the series that is being deployed on the JPSS (Joint Polar Satellite System) spacecraft by NOAA (National Oceanic and Atmospheric Administration) and NASA (National Aeronautics and Space Administration)
This paper describes a long-term testing of the automated calibration procedure based on reprocessing VIIRS solar calibration data starting from the beginning through near four years of the Suomi NPP mission
Summary
VIIRS (Visible Infrared Imaging Radiometer Suite) instrument has been operating onboard the Suomi NPP (National Polar-orbiting Partnership) satellite since November 2011 [1]. ‚ RSB (Reflective Solar Band) measurements consist of 14 channels covering the range from 400 to 2280 nm: RSB calibration uses onboard solar diffuser data collected once per orbit and space-view data from every scan. While DNB is a reflective band as well, its calibration methodology differs so much that it is beyond scope of the present work Since it was found early in the Suomi NPP mission that sensitivity of the VIIRS instrument in several spectral bands decreases with time much faster than expected [3], accuracy of the radiometric calibration has been maintained by updating processing coefficients with the weekly frequency (approximately every 100 orbits). Preliminary results from the reprocessing have been presented previously [5], but this is the first description and discussion of the complete results that include all reprocessed spectral bands and cover the entire duration of the Suomi NPP mission
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