Abstract:Suspended particle material is the main factor affecting remote sensing inversion of chlorophyll-a concentration (Chla) in turbidity water. According to the optical property of suspended material in water, the present paper proposed a linear baseline correction method to weaken the suspended particle contribution in the spectrum above turbidity water surface. The linear baseline was defined as the connecting line of reflectance from 450 to 750 nm, and baseline correction is that spectrum reflectance subtracts the baseline. Analysis result of field data in situ of Meiliangwan, Taihu Lake in April, 2011 and March, 2010 shows that spectrum linear baseline correction can improve the inversion precision of Chl a and produce the better model diagnoses. As the data in March, 2010, RMSE of band ratio model built by original spectrum is 4.11 mg·m-3, and that built by spectrum baseline correction is 3.58 mg·m-3. Meanwhile, residual distribution and homoscedasticity in the model built by baseline correction spectrum is improved obviously. The model RMSE of April, 2011 shows the similar result. The authors suggest that using linear baseline correction as the spectrum processing method to improve Chla inversion accuracy in turbidity water without algae bloom.
韦玉春, 王国祥,程春梅,张 静,孙晓鹏. 面向浑浊水体叶绿素a浓度遥感反演的光谱基线校正[J]. 光谱学与光谱分析, 2012, 32(09): 2546-2550.
WEI Yu-chun, WANG Guo-xiang, CHENG Chun-mei, ZHANG Jing, SUN Xiao-peng. Baseline Correction of Spectrum for the Inversion of Chlorophyll-a Concentration in the Turbidity Water. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(09): 2546-2550.
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