渤海固有光学量高光谱遥感反演

Hyperspectral Remote Sensing Retrieval of Inherent Optical Properties in the Bohai Sea

水体固有光学量是重要的海洋光学参数,是辐射传输模型最基本的输入参数,对于海洋光学遥感和水色研究具有重要意义。基于2005年渤海高光谱实测遥感反射率和总吸收系数数据,首次利用非线性最小化优化模型,反演水体总吸收系数等固有光学量。经过实测数据的检验,412,440,510,555,650和676nm波段总吸收系数的反演平均相对误差分别为33.8%,20.4%,27.7%,37.5%,9.5%和10.8%。模型误差源主要为模型参数的不确定性和测量误差,通过讨论发现,光谱斜率S对总吸收系数的反演影响相对较少,而光谱指数Y导致的反演误差是不可忽略的。模型适用于高光谱数据,填补渤海固有光学量的最优化反演研究的空白,并可用于高光谱遥感数据的固有光学量遥感反演研究。

Inherent optical properties are important marine optical parameters which are the basic input parameters of the radia- tive transfer model. Based on hyperspectral remote sensing reflectance and total absorption coefficient data measured in 2005 in the Bohai Sea, the nonlinear minimization model was firstly used to retrieve the inherent optical properties. The model was vali-dated by in situ data. The averaged percent errors were 33.8%, 20. 4%, 27. 7%, 37. 5%, 9. 5% and 10. 8% for the total ab- sorption coefficients at 412, 440, 510, 555, 650 and 676 nm bands respectively. The main error sources of model were the un- certainty of the model parameters and measurement errors. According to the discussion, the spectral slope S has a slight influ-ence on the retrieval of total absorption coefficients. However, the impact of the spectral power Y on the retrieval cannot be neg-ligible. The model is suitable for byperspectral data and can fulfill the gaps of inherent optical properties retrieval research in the Bohai Sea, so it can be used for hyperspectral remote sensing data to retrieve inherent optical properties.