地面与航空高光谱反射率联合反演技术研究

Research on Joint Reflectivity Inversion Techniques of Ground and Airborne Hyperspectral Data

成像高光谱仪可搭载在航空或地面平台上获取地物的纹理和光谱数据,为了准确确定地物属性,需要将数据反演成地物的反射率数据。传统的方法分别计算地面与航空成像高光谱的反射率^([1]),但由于有效像元面积较小、光谱混合等原因,计算得到的航空高光谱反射率误差较大。本研究获取了青海省都兰和甘肃祁连山地区的地面与航空高光谱测量同步及准同步测量数据,数据类型包括黑白布、水体、植被、水泥地面、花岗岩、砂石路等多个地点的地面成像光谱数据。在此基础上联合地面与航空成像高光谱数据,建立了基于地面成像光谱数据的航空高光谱反射率反演方法,通过计算平均光谱、经验线性方法等处理步骤,实现了对航空高光谱数据的反射率反演,通过对不同地物的光谱分析,表明反演结果较为理想。

The imaging hyperspectrometer can be mounted on an aeronautical or ground platform to acquire the texture and spectral data of the ground features.In order to accurately determine the attributes of the ground features,the data needs to be inverted into the reflectance data.The traditional methods calculate the hyperspectral reflectance of ground imaging hyperspectral and aerial imaging,respectively.But due to various reasons such as smaller effective pixel area and spectral mixing,the calculated reflectance spectral errors are relatively large.This study obtained simultaneous or quasi-simultaneous measurements of ground and airborne hyperspectral data in the Qilian Mountains and Dulan of Gansu province.The measurement data types included black and white cloth,water,vegetation,concrete floors,granite,and gravel roads.Comprehensive ground-based and aerial imaging hyperspectral data and a reflectance retrieval method based on ground imaging spectral data were established.By calculating the average spectrum,empirical linear methods and other processing steps,reflectance data of airborne hyperspectral data was achieved.Through the spectral analysis of different ground objects,it is shown that the inversion result is more ideal.