Bio-Optical Model of Total Suspended Matter Based on Reflectance in the Near Infrared Wave Band for Case-Ⅱ Waters
XU Jing-ping1,2,ZHANG Bai1,SONG Kai-shan1,WANG Zong-ming1,DUAN Hong-tao1,2,CHEN Ming1,2,YANG Fei1,2, LI Feng-xiu1,2
1. Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Changchun 130012, China 2. Graduate School of Chinese Academy of Sciences, Beijing 100039, China
Abstract：From August to October,2006, reflectance spectra were measured in a turbid Case-Ⅱ waters condition with an ASD FieldSpec spectrometer for a total of 58 samples. Based on the observation of reflectance curves, spectral analysis was carried out over 400-1 200 nm. Showing the typical character of Case-Ⅱ waters, the reflectance values were generally higher than those in other similar studies. Strong backscattering of high concentration total suspended matter (TSM) contributed considerably to the total reflectance spectra in water. Two obvious TSM reflectance peaks were observed in the near infrared wave bands, i.e. 808 and 1 067 nm, especially the latter one that was never reported before. The highest correlation coefficient between reflectance and concentrations of TSM existed at 873 nm. Based on the simplification of water inherent optical parameters in the near-infrared wave band, including absorption of TSM, Chlorophyll-a (Chl-a) and chromophoric dissolved organic matter (CDOM), and backscattering of pure water, Chl-a and CDOM, three empirical equations of the bio-optical model using reflectance at 808, 873 and 1 067 nm respectively were established to estimate the concentrations of TSM. Compared with linear and exponential models, the bio-optical model showed fairly good performance with comparatively high determination coefficient (r2) and low root mean squared error (RMSE), which confirmed the applicability of the bio-optical model to retrieve concentrations of TSM effectively in turbid Case-Ⅱ waters.
Key words：Remote sensing;Case-Ⅱwaters;Concentrations of total suspended matter (TSM);Bio-optical model;Near infrared wave band
徐京萍1,2,张柏1,宋开山1,王宗明1,段洪涛1,2,陈 铭1,2,杨 飞1,2,李凤秀1,2 . 近红外波段二类水体悬浮物生物光学反演模型研究[J]. 光谱学与光谱分析, 2008, 28(10): 2273-2277.
XU Jing-ping1,2,ZHANG Bai1,SONG Kai-shan1,WANG Zong-ming1,DUAN Hong-tao1,2,CHEN Ming1,2,YANG Fei1,2, LI Feng-xiu1,2. Bio-Optical Model of Total Suspended Matter Based on Reflectance in the Near Infrared Wave Band for Case-Ⅱ Waters. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(10): 2273-2277.
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