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Proceedings Paper

Using MODIS to calibrate NOAA series AVHRR reflective solar channels
Author(s): A. Wu; A. Angal; X. Xiong
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Paper Abstract

Nearly 30 years of continuous observations made by a series of AVHRR sensors have offered a great potential for studies of global environment and climate change. In order to achieve this objective, each sensor must be accurately and consistently calibrated. This is not an easy task as there is no onboard calibrator for AVHRR reflective solar channels and vicarious calibration often needs to accumulate enough observations to derive useful trends. In this study, we select CEOS (the Committee on Earth Observation Satellites) endorsed Cal/Val desert sites to track the long-term stability of reflective solar channels of NOAA-17 AVHRR (launched on June 24, 2002) and re-calibrate them using well-calibrated MODIS as reference. A site-specific Bi-directional Reflectance Distribution Function (BRDF) developed based on observations made by MODIS is used to normalize AVHRR observed reflectances. Impacts of atmospheric water vapor on AVHRR to MODIS reflectance ratios are corrected with measured total water vapor contents derived from the split-window temperature difference technique. Finally, MODIS-based AVHRR calibration coefficients on top of the AVHRR prelaunch values are provided in time-dependent look-up tables (LUT). A further validation is performed using MODIS and AVHRR observations obtained over Antarctic Dome C site where impact due to atmospheric water vapor is negligibly small.

Paper Details

Date Published: 13 September 2011
PDF: 10 pages
Proc. SPIE 8153, Earth Observing Systems XVI, 815317 (13 September 2011); doi: 10.1117/12.892602
Show Author Affiliations
A. Wu, Sigma Space Corp. (United States)
A. Angal, Science Systems and Applications, Inc. (United States)
X. Xiong, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 8153:
Earth Observing Systems XVI
James J. Butler; Xiaoxiong Xiong; Xingfa Gu, Editor(s)

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