Using the Dome C site to characterize AVHRR near-infrared channel for consistent radiometric calibration

Sirish Uprety; Changyong Cao

doi:10.1117/12.892481

13 September 2011 Using the Dome C site to characterize AVHRR near-infrared channel for consistent radiometric calibration

Sirish Uprety, Changyong Cao

Author Affiliations +

Proceedings Volume 8153, Earth Observing Systems XVI; 81531Y (2011) https://doi.org/10.1117/12.892481
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

Abstract

AVHRR is a heritage instrument on NOAA's polar orbiting satellites with more than 30 years of global earth observation. Due to absence of onboard calibrator for the visible and near-infrared channels, AVHRR sensors rely on desert sites for relative calibration with uncertainties primarily due to lack of rigorous site characterization and atmospheric effects. This study aims at quantifying the long term degradation of the near-infrared channel (0.86 μm) of AVHRR using the Antarctic Dome C site which has very small atmospheric effects. All afternoon-orbit NOAA series AVHRR instruments are included in this study. Though the TOA reflectance data exists only during austral summer for Dome C, the degradation estimated using TOA reflectance time series for the respective instruments is comparable to those from the previous studies. The degradation estimated suggests that NOAA-7 and -9 have the largest calibration drift (greater than -3% per year) compared to the other instruments which have less than -1.5% drift per year. The AVHRR channel 2 (0.86 μm) calibration using desert sites has always been challenging due to high uncertainty mainly introduced by the presence of water vapor absorption at this wavelength. The study shows that, due to the extremely cold and dry climate of Dome C, the water vapor absorption effect is negligible and thus it is possible to calibrate nearinfrared channel (0.86 μm) with calibration uncertainty less than 1%.

Citation Download Citation

Sirish Uprety and Changyong Cao "Using the Dome C site to characterize AVHRR near-infrared channel for consistent radiometric calibration", Proc. SPIE 8153, Earth Observing Systems XVI, 81531Y (13 September 2011); https://doi.org/10.1117/12.892481

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