One of the most effective ways of remotely sensing the characteristics of a body of ocean water is to measure its spectral radiance in the visible region of the spectrum. The visible region is the only part of the electro-magnetic spectrum in which light is transmitted by water to a substantial degree, and as such is the only spectral region in which remotely sensed information can be obtained directly about subsurface conditions. These conditions can include the distribution, concentration, and type, of plankton, sediments and some pollutants.
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