ALI遥感数据的岩矿反射率反演方法研究

The Research on Reflectance Retrieval Method of ALI Remote Sensing Data

岩矿反射率反演是遥感蚀变信息提取中最基础、最关键的一个过程。本介绍了卫星EO-1携带的先进陆地成像仪(ALI)为及其定标方式,分析了两种重要的岩矿反射率反演方法:表观反射率的计算和地表真实反射率的反演。通过分析表明:表观反射率实现关键是参数的获取,地表真实反射率反演关键是模型的选择和参数设置。就反演效果来说,基于大气辐射传输的FLAASH模型优于公式计算的表观反射率,这对应用遥感数据进行岩矿蚀变信息提取的研究人员有一定的参考价值。

The reflectance inversion of rock is the basic and key process for the extraction of alteration information from RS image.This paper introduces the Advanced Land Imager(ALI) which is carried in the satellite EO-1 and its calibration manner,analyzes two important reflectance reversion methods-the calculation of apparent reflectance and the retrieval surface reflectance.Through analysis we can see that for the apparent reflectance,the key question is how to get parameter;for the surface reflectance,the key question is the selection of model and the model parameter.The reflectance from the calculation of FLAASH model is better than apparent reflectance which is calculated based on formula.This can help the researcher to extract alteration information of rock from RS image.