Characteristics of the sea ice reflectance spectrum polluted by oil spills based on field experiments in the Bohai Sea
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摘要: 本文通过测量野外现场模拟的渤海海冰冰面溢油的反射光谱,详细分析了海冰-油膜混合像元的反射率特征。结果发现,海冰与油膜的的混合像元是属于线性混合像元。本文提出利用双波段比值油膜-海冰指数(Double-band Ratio Oil-film Seaice Index,DROSI)和标准差异油膜-海冰指数(Normalized Difference Oil-film Seaice Index,NDOSI)分析海冰-油膜像元的反射曲线。海冰-油膜像元中油膜的面积比例可以通过波段为1610-1630nm平均反射率精确估算,进而可以进一步估算出油的体积。本研究中,海冰-油膜像元的提取方法及用于估算混合像元中油膜面积比例的模型可以被用于利用短波红外波段(1500-1780nm)高光谱遥感图像监测渤海海冰覆盖区的溢油事故。Abstract: Oil spilled on the sea ice surface in the Bohai Sea of China is studied through the field measurements of the reflectance of a simulated sea ice-oil film mixed pixel. The reflection characteristics of sea ice and oil film are also analyzed. It is found that the mixed pixel of sea ice and oil film is a linear mixed pixel. The means of extracting sea ice pixels containing oil film is presented using a double-band ratio oil-film seaice index (DROSI) and a normalized difference oil-film seaice index (NDOSI) through the analysis of the reflectance curves of the sea ice-oil film pixel for different ratios of oil film. The area proportion of the oil film in the sea ice-oil film pixel can be accurately estimated by the average reflectance of the band of 1 610-1 630 nm, and the volume of the spilled oil can be further estimated. The method of the sea ice-oil film pixel extraction and the models to estimate the proportion of oil film area in the sea ice-oil film pixel can be applied to the oil spill monitoring of the ice-covered area in the Bohai Sea using multispectral or hyperspectral remote sensing images in the shortwave infrared band (1 500-1 780 nm).
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Key words:
- remote sensing /
- sea ice /
- the Bohai Sea of China /
- oil spill /
- mixed pixel
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