Abstract
Similar to the Reflective Solar Band (RSB) calibration, Suomi-National Polar-orbiting Partnership (S-NPP) Visible Infrared Imaging Radiometer Suite (VIIRS) on-board calibration of Day Night Band (DNB) is based on the Solar Diffuser (SD) observations in the Low Gain State (LGS). DNB has a broad spectral response covering a wavelength range roughly from 500 nm to 900 nm with a large dynamic range from three different gain states called High Gain State (HGS), Mid Gain State (MGS), and LGS. The calibration of MGS and HGS is also dependent on the LGS gain estimation with the gain ratios for each gain state. Over the lifetime of S-NPP VIIRS operations, the LGS gains have been derived from the on-board SD observations since its launch in October 2011. In this study, the lifetime LGS gains are validated by the lunar calibration coefficients (defined as F-factors) using a lunar irradiance model called Global Space-based Inter-Calibration System (GSICS) Implementation of RObotic Lunar Observatory (ROLO) (GIRO). Using the moon as an independent on-orbit calibration source, the S-NPP VIIRS DNB on-board SD based radiometric calibration is validated by the lunar F-factors within two percent of the lunar F-factors in terms of the standard deviation in the long-term trends over nine years of the S-NPP VIIRS operation.
Highlights
The Suomi-National Polar-orbiting Partnership (S-NPP) satellite was launched on October 28, 2011 including Visible Infrared Imaging Radiometer Suite (VIIRS) sensor to provide continuous global observations following the legacy imaging instruments such as National Aeronautics and Space Administration’s (NASA) Moderate Resolution ImagingSpectroradiometer (MODIS) and National Oceanic and Atmospheric Administration’s (NOAA) Advanced Very-High Resolution Radiometer (AVHRR) [1,2]
Work,we we provide provide descriptions lunar calibration algorithm used by this descriptionsofofcurrent current lunar calibration algorithm used77by
The ratio LUT indicated by R in Equation (3) is derived from the Solar Diffuser (SD) observations in each aggregation zone which transfers gain from Low Gain State (LGS) to Mid Gain State (MGS) or LGS to High Gain States (HGS) according to the gain state information in each pixel
Summary
The Suomi-National Polar-orbiting Partnership (S-NPP) satellite was launched on October 28, 2011 including Visible Infrared Imaging Radiometer Suite (VIIRS) sensor to provide continuous global observations following the legacy imaging instruments such as National Aeronautics and Space Administration’s (NASA) Moderate Resolution Imaging. In addition to the RSBs and TEBs, DNB is a unique panchromatic band approximately covering 500 nm to 900 nm with capability of day and night observations from its Low Gain State (LGS), Mid. Gain State (MGS), and High Gain States (HGS). SeaWifs, to validate the on-orbit calibration for the earth observing sensors like SeaWifs, Terra Terra and and AquaMODIS, MODIS,Landsat-8. Calibration, we detailed steps of the ofoflunar wepresent present detailed steps ofon-orbit the on-orbit modulated modeling, thethe lunar irradiance model called. RSB 89 and view dataview setsdata are used forused on-orbit calibration for TEB calibration along with the SV data, which provides detector bias at the zero signal [14,15,16,17].
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