
Proceedings Paper
Using CEOS reference standard test sites to track the calibration stability of NOAA-19 AVHRR reflective solar channelsFormat | Member Price | Non-Member Price |
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Paper Abstract
In recent years, there is an increasing interest to establish a global integrated network of calibration sites
for the purpose of tracking sensor performance, conducting cross-sensor comparison and assessing data
quality and consistency. Based on such a need, the Committee on Earth Observation Satellites (CEOS)
proposed eight instrumented sites for which surface measurements can be acquired through field
campaigns and five pseudo-invariant desert sites typically consisting of sand dunes. In this study, we
select one site from each category to study the calibration stability of reflective solar channels of NOAA-
19 Advanced Very High Resolution Radiometer (AVHRR) (launched on February 6, 2009). Since
AVHRR does not have an onboard calibrator for the reflective solar channels and vicarious calibration
often needs long-term observations to derive reliable trends, this study will provide an early assessment of
sensor on-orbit calibration performance and establish a preliminary trend to examine its calibration
consistency with other sensors. The Antarctic Dome C site is selected primarily to monitor the on-orbit
calibration performance whereas Libya 4 test site is used to evaluate the cross-calibration consistency of
AVHRR with other sensors. A site-specific Bi-directional Reflectance Distribution Function (BRDF)
model developed based on observations made by Moderate Resolution Imaging Spectroradiometer
(MODIS) is used to normalize AVHRR observed Top-of-Atmosphere (TOA) reflectances. Impact due to
calibration applied to NOAA-19 AVHRR L1B is assessed separately using a constant detector response.
Results show that for NOAA-19 AVHRR solar channels 1 and 2, variations in reflectance during the first
year after launch are still around 6% and more than 10%, respectively, either due to sensor change or
improper adjustment of calibration coefficients. While two sites provide consistent trends for the visible
channel, the Dome C site is more suitable for the near-infrared channel as impacts of the absorption by
atmospheric water vapor are minimal.
Paper Details
Date Published: 13 October 2010
PDF: 10 pages
Proc. SPIE 7826, Sensors, Systems, and Next-Generation Satellites XIV, 782621 (13 October 2010); doi: 10.1117/12.864601
Published in SPIE Proceedings Vol. 7826:
Sensors, Systems, and Next-Generation Satellites XIV
Roland Meynart; Steven P. Neeck; Haruhisa Shimoda, Editor(s)
PDF: 10 pages
Proc. SPIE 7826, Sensors, Systems, and Next-Generation Satellites XIV, 782621 (13 October 2010); doi: 10.1117/12.864601
Show Author Affiliations
Aisheng Wu, Sigma Space Corp. (United States)
Amit Angal, Science Systems and Applications, Inc. (United States)
Amit Angal, Science Systems and Applications, Inc. (United States)
Jack Xiong, NASA Goddard Space Flight Ctr. (United States)
Changyong Cao, National Environmental Satellite, Data, and Information Service (United States)
Changyong Cao, National Environmental Satellite, Data, and Information Service (United States)
Published in SPIE Proceedings Vol. 7826:
Sensors, Systems, and Next-Generation Satellites XIV
Roland Meynart; Steven P. Neeck; Haruhisa Shimoda, Editor(s)
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