The Day Night Band (DNB), mounted on the Visible Infrared Imaging Radiometer Suite (VIIRS) on board the
Suomi National Polar-orbiting Partnership (NPP), has the unique ability to image cloud and surface features with
reflected moonlight and nonlunar nighttime illumination sources. However, the radiometric calibration is too
difficult to be calculated directly at night due to extremely low radiance. The Dome C in Antarctic and Railroad
Valley Playa in Nevada are utilized to calibrate the DNB High Gain Stage (HGS) at night due to their invariable
surface properties. The mean value of the relative errors based on Dome C site is -7.41% and RVP is -4.14%. The
results suggest that there is an average bias in the DNB HGS on-orbit calibration and an unobvious trend exists due
to the changing relative spectral responses over time.
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