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Improving Ocean Color Data Products using a Purely Empirical Approach: Reducing the Requirement for Radiometric Calibration AccuracyRadiometric calibration is the foundation upon which ocean color remote sensing is built. Quality derived geophysical products, such as chlorophyll, are assumed to be critically dependent upon the quality of the radiometric calibration. Unfortunately, the goals of radiometric calibration are not typically met in global and large-scale regional analyses, and are especially deficient in coastal regions. The consequences of the uncertainty in calibration are very large in terms of global and regional ocean chlorophyll estimates. In fact, stability in global chlorophyll requires calibration uncertainty much greater than the goals, and outside of modern capabilities. Using a purely empirical approach, we show that stable and consistent global chlorophyll values can be achieved over very wide ranges of uncertainty. Furthermore, the approach yields statistically improved comparisons with in situ data, suggesting improved quality. The results suggest that accuracy requirements for radiometric calibration cab be reduced if alternative empirical approaches are used.
Document ID
20090008686
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Gregg, Watson
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 24, 2013
Publication Date
October 6, 2008
Subject Category
Geophysics
Meeting Information
Meeting: Ocean Optics Conference
Location: Barga
Country: Italy
Start Date: October 6, 2008
End Date: October 10, 2008
Sponsors: Oceanography Society
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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