Assessment of sea slope statistical models using a detailed micro-facet BRDF and upwelling radiance measurements

Vincent Ross; Denis Dion

doi:10.1117/12.565127

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11 November 2004 Assessment of sea slope statistical models using a detailed micro-facet BRDF and upwelling radiance measurements

Vincent Ross, Denis Dion

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Proceedings Volume 5572, Optics in Atmospheric Propagation and Adaptive Systems VII; (2004) https://doi.org/10.1117/12.565127
Event: Remote Sensing, 2004, Maspalomas, Canary Islands, Spain

Abstract

An attempt is made to evaluate three different models correlating sea slope variance with wind speed, which are a crucial component of the statistical approach to calculating the sea surface BRDF (Bidirectional Reflectance Distribution Function). The models are those of Cox & Munk, Wu and Mermelstein et al. This is done with the help of publicly available upwelling radiance data taken at the COVE rigid costal platform with a scanning spectral photometer at wavelengths around 444 nm, 501 nm, 677 nm and 864 nm for a wide range of azimuth and elevation angles. The three sea slop variance models are compared with variances inferred from the data by inverting a BRDF models that includes facet hiding and shadowing as well as facet projection weighing. The validity of the models is discussed in the context of varying wind speed and direction. Limitations when dealing with near-horizon BRDF modeling using these statistical models are discussed along with potential improvements.

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Vincent Ross and Denis Dion "Assessment of sea slope statistical models using a detailed micro-facet BRDF and upwelling radiance measurements", Proc. SPIE 5572, Optics in Atmospheric Propagation and Adaptive Systems VII, (11 November 2004); https://doi.org/10.1117/12.565127

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