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Proceedings Paper

The calibration of AVHRR visible dual gain using Meteosat-8 for NOAA-16 to 18
Author(s): David R. Doelling; Donald P. Garber; Lance A. Avey; Louis Nguyen; Patrick Minnis
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Paper Abstract

The NOAA AVHRR program has given the remote sensing community over 25 years of imager radiances to retrieve global cloud, vegetation, and aerosol properties. This dataset can be used for long-term climate research if the AVHRR instrument is well calibrated. Unfortunately, the AVHRR instrument does not have onboard visible calibration and does degrade over time. Vicarious post-launch calibration is necessary to obtain cloud properties that are not biased over time. The recent AVHRR/3 instrument has a dual gain in the visible channels in order to achieve greater radiance resolution in the clear-sky. This has made vicarious calibration of the AVHRR/3 more difficult to unravel. Reference satellite radiances from well-calibrated instruments, usually equipped with solar diffusers, such as MODIS, have been used to successfully vicariously calibrate other visible instruments. Transfer of calibration from one satellite to another using co-angled, collocated, coincident radiances has been well validated. Terra or Aqua MODIS and AVHRR comparisons can only be performed over the poles during summer. However, geostationary satellites offer a transfer medium that captures both parts of the dual gain. This AVHRR/3 calibration strategy uses Meteosat-8 radiances (calibrated with MODIS) simultaneously to determine the dual gains using 50km regions. The dual gain coefficients will be compared with the nominal coefficients. Results will be shown for all visible channels for NOAA-17.

Paper Details

Date Published: 24 September 2007
PDF: 11 pages
Proc. SPIE 6684, Atmospheric and Environmental Remote Sensing Data Processing and Utilization III: Readiness for GEOSS, 668409 (24 September 2007); doi: 10.1117/12.736080
Show Author Affiliations
David R. Doelling, Science Systems and Applications, Inc. (United States)
Donald P. Garber, NASA Langley Research Ctr. (United States)
Lance A. Avey, Science Systems and Applications, Inc. (United States)
Louis Nguyen, NASA Langley Research Ctr. (United States)
Patrick Minnis, NASA Langley Research Ctr. (United States)

Published in SPIE Proceedings Vol. 6684:
Atmospheric and Environmental Remote Sensing Data Processing and Utilization III: Readiness for GEOSS
Mitchell D. Goldberg; Hal J. Bloom; Allen H.-L. Huang; Philip E. Ardanuy, Editor(s)

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