The reflectance spectra and secchi disk depths (SDD) in seawater were collected from two cruises carried out in Sishili Bay in Apr. Jun. 2009. The original spectra with 0.19 nm spectral resolution were re-sampled to 10 nm, and then the first-order and second-order difference spectra were processed. The correlation analysis was performed between SDD and each band. The correlation coefficients between SDD and the second-order difference spectra are about 11% hither than others. The estimation model of SDD was established using the second-order difference spectra at the wavelength of 695 nm on the base of the analytical result. The result showed that this model performed better than the single-band and multi-band models,with the root mean square error (RMSE) of 0.1 m and the average relative error (SE) of 7.9%,respectively. The data obtained from in the same study area in Apr. 2009 as independent samples was used to test this model,and the verification model's RMSE of 0.34 m and SE of 16%. It is suggested a new way for water transparency in the Chinese coastal waters.
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