Ruddick et al. [Appl. Opt. 39, 897 (2000)] extended the standard SeaWiFS atmospheric-correction algorithm for use over turbid coastal and inland waters. However, Ruddick’s method is based on the assumption of a spatially homogeneous constant ratio for the water-leaving reflectances normalized by the sun-sea atmospheric transmittance at 765 and 865 nm. Such first-order b b/a model-based assumption can result in an inaccuracy for highly turbid water. Using the first- and second-order b b/(a + b b) models as well as the second-order b b/a model (which, more realistically, do not assume spatial homogeneity ratio), we suggest using the modified assumption, R (8)-1 = α0 R (7)-1 + (l 1 Q)-1 (1 - α0), instead of Ruddick’s assumption, in SeaWiFS atmospheric-correction algorithms for highly turbid waters.
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