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Vladimirov V.L., Afonin E.I., Urdenko V.A., Martinov O.V.
Using of the color index sensors during the earth truth experiments for remote sensing of the ocean. - Optical Remote sensing of the sea and the influence of the atmosphere. Moscow-Berlin-Sevastopol, German Institute for Space Research, 1987, v.2, part 2, p.85-122 (in Russian).


The paper discusses a possibility to use color index as a routine variable during sea truth measurements for remote sensing of the ocean. Color index is defined as the ratio of two upward light radiances measured at nadir at both 540 and 420 nm. The results of ten years of in situ measurements of the color index using specially designed instruments gave a huge amount of data. These data showed the big ranges of the color index variability (more than three orders of amplitude) and its high sensitivity to the concentration of the particulate and dissolved matter in the euphotic layer of the sea.
The regressions are done of the color index and other characteristics of the upward light field, and of the color index and the concentration of the different kinds of the particulate and dissolved matter, including chlorophyll concentration. Some questions of the methods of the color index measurements are discussed. It is shown that the color index can be successfully used for the interpretation of spaceborne and airborne optical remote information.