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由于轨传感器位置影响,传感器接收的能量不完全来自地物的反射,地面与传感器间大气辐射能量的作用同样不可忽略.通过中分辨率大气辐射传输模型(moderate resolution atmosphere transmittance and radiance code,MODTRAN)将辐射传输过程与传感器光谱响应函数进行耦合运算,基于二长花岗岩、正长岩、石英正长岩及石英闪长岩的地面实测光谱数据及测量时大气和几何条件,完成了4种岩性先进星载热发射和反射辐射仪(advanced spaceborne theemal emission and reflection radiometer,ASTER)通道星上光谱的模拟,建立了实测光谱数据与星上光谱数据间的联系,证明将地面与传感器间大气辐射影响耦合到传感器接收地面反射能量过程中的必要性,从而为多光谱影像的形成和应用提供了支持.
Due to the influence of the position of the rail sensor, the energy received by the sensor does not come completely from the reflection of the ground object, so the radiation energy of the atmosphere between the ground and the sensor can not be neglected either.According to MODTRAN (medium resolution radiative transfer model) Coupling the radiative transfer process with the spectral response function of the sensor, based on the measured ground-based spectral data of monzogranite, syenite, quartz syenite and quartz diorite and the atmospheric and geometrical conditions at the time of measurement, four lithologies Advanced spaceborne theemal emission and reflection radiometer (ASTER), the establishment of the relationship between the measured spectral data and the spectral data on the satellite, the ground and the sensor to prove the impact of atmospheric radiation The necessity of coupling to the sensor to receive ground reflection energy provides support for the formation and application of multispectral images.