Proceedings PaperSpectral contrast of oil films on the sea surface: influence of water type, wind velocity, and solar altitude
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Contrast of oil film against the rough sea surface background was estimated for the wavelength range from 300 - 800 nm in various observation conditions. Morel and Prieur's experimental data on water reflectance in the visible spectrum were used as the basis for computations. Extrapolations of these data to the UV and IR regions are based on the well-known low- parametric models for water properties. The computations show that the contrast magnitude varies depending on the water type, wavelength, wind velocity and solar altitude from -90% to +60% (plus relates to the case when oil is brighter than water, minus relates to the opposite case). To avoid small or zero contrasts, observations apparently should be fulfilled in several spectral channels. Calculation method was verified during a flight over the Black Sea when predicted oil-water contrast was obtained with two airborne TV-cameras operating in the visible and UV spectral regions.