水体后向散射系数校正方法研究

后向散射系数是水色反演半分析模型的重要参数,后向散射系数的测量与分析是固有光学测量与分析的重要组成部分。为了更准确的获得后向散射系数数据,根据不同的实际测量情况提出了两种后向散射系数数据的校正方法,即利用散射与后向散射系数模型计算的散射系数替代法和实测数据替代法。结果表明这两种方法在比传统的数据校正方法有明显的优势,是一种符合水体剖面固有光学特性规律的数据校正方法。

Correction of Backscattering Coefficients in Different Water Bodies

Semi-analytical models,integrating remote sensing reflectance with absorption coefficient and backscattering coefficient,are the key to retrieve concentrations of water constituents in water color remote sensing.So the backscattering coefficient is the essential to develop semi-analytical algorithm.The next problem is how to acquire the corrected backscattering coefficient with high-precision because of different water bodies with different turbidities.Two methods are developed in this paper.One is estimate scattering coefficient b with the model instead of the parameter for correction.The other is correction from measured data.When measured profiled backscattering coefficient,the optimal method is the latter,when measured backscattering coefficient at certain depth,both the two ways.