摘要：An analytical three-band algorithm for spectrally estimating chlorophyll-a (Chl-a) has been
proposed recently and the model does not need to be trained. However, the model did
not consider the effects of the absorption due to colored detritus matter (CDM)
and backscattering of the water column, resulting in an overestimation when
Chl-a < 50 mg m − 3 and an
underestimation when Chl-a ≥ 50 mg m − 3. In this letter, an improved three-band algorithm is proposed by integrating both
backscattering and CDM absorption coefficients into the model. The results demonstrate
that the improved three-band model resulted in more accurate estimation of Chl-a than
the previously used three-band model when they were applied to water samples
collected from five highly turbid water bodies with Chl-a ranging from 2.54 to 285.8 mg m − 3. The best results, after model modification, were observed in three Indiana reservoirs with
R2 = 0.905 and relative root mean square error of 20.7%, respectively.
