Operational calibration of solar reflectance channels of the advanced very high resolution radiometer (AVHRR)

Xiangqian Wu

doi:10.1117/12.561289

26 October 2004 Operational calibration of solar reflectance channels of the advanced very high resolution radiometer (AVHRR)

Xiangqian Wu

Author Affiliations +

Proceedings Volume 5542, Earth Observing Systems IX; (2004) https://doi.org/10.1117/12.561289
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

The AVHRR solar reflectance channels need on-orbit calibration that can only be done vicariously. For over a decade, NOAA/NESDIS has paid particular attention to the vicarious calibration based on the Libyan Desert. A previous algorithm was remarkably precise (<2%) in predicting the long term instrument degradation, but because it omitted the seasonal variation caused by the bidirectional reflectance distribution function of the target, the postlaunch calibration was much less precise (~5%). Careful selection of more uniform target and better detection of contaminated measurements (by clouds, dust storm, and wet surface after rain) further reduced noises in the data used to monitor instrument degradation. Together, these improvements reduced latency of post-launch calibration from 3-4 years to 18 months, with enhanced statistical confidence.

Citation Download Citation

Xiangqian Wu "Operational calibration of solar reflectance channels of the advanced very high resolution radiometer (AVHRR)", Proc. SPIE 5542, Earth Observing Systems IX, (26 October 2004); https://doi.org/10.1117/12.561289

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