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Proceedings Paper

Evaluation of atmospheric correction algorithms for processing SeaWiFS data
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Paper Abstract

To enable the production of the best chlorophyll products from SeaWiFS data NOAA (Coastwatch and NOS) evaluated the various atmospheric correction algorithms by comparing the satellite derived water reflectance derived for each algorithm with in situ data. Gordon and Wang (1994) introduced a method to correct for Rayleigh and aerosol scattering in the atmosphere so that water reflectance may be derived from the radiance measured at the top of the atmosphere. However, since the correction assumed near infrared scattering to be negligible in coastal waters an invalid assumption, the method over estimates the atmospheric contribution and consequently under estimates water reflectance for the lower wavelength bands on extrapolation. Several improved methods to estimate near infrared correction exist: Siegel et al. (2000); Ruddick et al. (2000); Stumpf et al. (2002) and Stumpf et al. (2003), where an absorbing aerosol correction is also applied along with an additional 1.01% calibration adjustment for the 412 nm band. The evaluation show that the near infrared correction developed by Stumpf et al. (2003) result in an overall minimum error for U.S. waters. As of July 2004, NASA (SEADAS) has selected this as the default method for the atmospheric correction used to produce chlorophyll products.

Paper Details

Date Published: 22 August 2005
PDF: 7 pages
Proc. SPIE 5885, Remote Sensing of the Coastal Oceanic Environment, 58850X (22 August 2005); doi: 10.1117/12.615722
Show Author Affiliations
Varis Ransibrahmanakul, CCMA at NOAA/NOS (United States)
Richard Stumpf, CCMA at NOAA/NOS (United States)
Sathyadev Ramachandran, SP Systems Inc. (United States)
Kent Hughes, CoastWatch at NOAA/NESDIS/ORA (United States)

Published in SPIE Proceedings Vol. 5885:
Remote Sensing of the Coastal Oceanic Environment
Robert J. Frouin; Marcel Babin; Shubha Sathyendranath, Editor(s)

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