热红外遥感中大气透过率的研究(一):大气透过率模式的构建

Study on atmospheric transmittance of thermal infrared remote sensing(Ⅰ): derivation of atmospheric transmittance model

大气透过率是热红外遥感中的一个重要参数。通过辐射传输模型MODTRAN模拟热红外波段的大气透过率,构建了基于大气模型、气溶胶模型、水汽量、能见度和观测天顶角等5个因素的大气透过率查找表,分析了不同参数对热红外大气透过率光谱曲线的影响,通过方差分析确定了影响大气透过率的关键因子,针对不同类型的气溶胶模型,构建了基于水汽量、能见度和观测天顶角的常用卫星传感器热红外通道的大气透过率经验模式,解决了卫星热红外遥感中大气透过率精确计算的问题。

Atmospheric transmittance is an important parameter in the thermal infrared remote sensing. A multi-variable lookup table of atmospheric transmittance which includes atmospheric model, aerosol model, water vapor content, visibility and view zenith angle was constructed based on the radiation transfer model MODTRAN, effect of different parameters on thermal infrared atmospheric transmittance spectrums was analyzed, the key variables of atmospheric transmittance were determined by the analysis of variance. According to different types of aerosol model, the multi-variable linear regression models of atmospheric transmittance models were deduced based on the water vapor content, visibility and view zenith angle for common thermal infrared sensor channels, which will solve the problem on calculating accurately the atmospheric transmittance for the thermal infrared remote sensing by satellite.