A conceptual model containing reflectance in three spectral bands in the red and near infrared ranges of the spectrum can
be used to retrieve vegetation pigment concentration. Based on this model, the bio-optical properties of Chlorophyll-a
(Chl-a), suspended solids, dissolved organic matter and water molecules were analyzed in this paper, by using in-situ
spectra data, optical parameters and water quality parameters in Taihu Lake. Under the band range determined by
spectral feature analysis, the optimal combination of bands (678 nm, 696 nm and 748 nm) was selected through the
iterative method, to compose an optimized band combination in order to build the Chl-a semi-analytical model. Based on
hyper-spectral imager (HSI) data carried on the Environmental 1 (HJ-1) satellite, this model was used successfully to
retrieve the Chl-a concentration in Taihu Lake.