HY-1 CCD宽波段水色要素反演算法

利用2003年春季黄海、东海区现场实测数据,建立了HY1卫星4波段CCD成像仪水色要素反演算法.由于HY1CCD的宽波段特性阻碍了黄色物质的反演,因此反演的水色要素仅包括水体表层的总悬浮物、悬浮泥沙(SS)以及叶绿素a的浓度.现场遥感反射率光谱由ASD地物波谱仪测量,对于叶绿素a的浓度利用现场萃取荧光法测量,总悬浮物、悬浮泥沙由实验室滤膜称重法获得.反演算法的拟合相关系数均大于0.88,平均相对误差在40%以下.对反演算法进行了误差灵敏度分析,结果表明对于总悬浮物、悬浮泥沙和低浊度水体中的叶绿素a的浓度反演算法能够满足日常的业务运行要求,但是对于高浊度水体中叶绿素a的浓度反演算法对某个波段组合比较敏感,仍需要进一步探讨.

Inverse algorithms of ocean constituents for HY-1/CCD broadband data

Inverse algorithms of ocean constituents for 4 bands HY-1/CCD imager were developed using in-situ data which acquired in the Huanghai Sea and the East China Sea in the springtime of 2003. The retrieved ocean constituents include total suspended matter (TSM), suspended sediment (SS) and chlorophyll a (Chl a) of surface water, broadband characteristics of CCD baffled the inversion of colored dissolved organic matter (CDOM). In-situ remote sensing reflectance spectra were acquired using ASD spectroradiometer, standard fluorometric method was used for extracting Chl a concentration in-situ, and filterpad samples were brought back to the laboratory for analysis of TSM and SS. For these constituents retrieval, correlation coefficient values are over 0.88 and average relative error values are under 40%. The error sensitivity of the inverse algorithms is also tested, it shows that the inverse algorithms of TSM, SS and Chl a concentration in the middle-low turbid water can meet daily operation, but it needs further research for the retrieval algorithm of Chl a concentration in the high turbid water.