近岸水上油膜高光谱遥感特征分析

Analysis of hyper-spectral remote sensing features of oil film on nearshore waters

基于便携式地物波谱仪与岸基光谱成像仪数据,模拟获取了近岸海上油膜的反射率光谱数据与高光谱影像数据。通过对反射率数据及其一阶导数等的分析,提出了油膜区别于海水的光谱特征,利用基于端元波谱提取的光谱角度填充（SAM,spectral angle mapping）分类方法对高光谱影像数据进行了油膜提取。结果表明,海水、薄油膜、厚油膜在可见光-近红外范围内反射特征差异较大,在1000~2500 nm的近红外波段仅有厚油膜区分度较高。

The reflectance spectrum and hyper-spectral images were obtained via a portable spectroradiometer and an imaging spectrometer respectively. Some typical features of oil film reflectance spectrum were extracted after the explo- ration of the reflectance and their first-order derivatives. The image was classified using the end-member＇ s spectra based Spectral Angle Mapping （SAM） method. The result showed that, for the sea water, thin oil film and thick oil film,the range of visible-near infrared was the optimum to distinguish one from the others and the range of 1000 ~ 2500nm was more suitable for the thick oil film to be identified.