Dr. Varis Ransibrahmanakul Profile

Dr. Varis Ransibrahmanakul

Physical Scientist at NOAA

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Proceedings Article | 23 August 2005 Paper

Evaluation of atmospheric correction algorithms for processing SeaWiFS data

Varis Ransibrahmanakul, Richard Stumpf, Sathyadev Ramachandran, Kent Hughes

Proceedings Volume 5885, 58850X (2005) https://doi.org/10.1117/12.615722

KEYWORDS: Atmospheric corrections, Near infrared, Reflectivity, Satellites, Aerosols, Calibration, Remote sensing, Algorithm development, Scattering, Atmospheric particles

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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.

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