高光谱遥感地形影响建模与仿真

针对地形起伏对高光谱遥感图像几何变形和辐射变化的影响,建立高光谱遥感地形影响模型.该模型利用传感器位置、姿态和视场角建立模拟图像像元坐标和地面空间坐标之间的成像几何关系,利用地表反射率、数字高程模型等数据,考虑大气辐射传输过程,计算起伏地形下传感器入瞳辐亮度图像,并经过空间分辨率转换,生成最终遥感模拟图像,实现高光谱遥感地形影响精确建模.利用西藏驱龙地区Hyperion数据和其它相关数据进行仿真分析,将模拟图像和原始图像进行对比,结果比较吻合,表明该模型具有较好的模拟效果.

Modeling and simulation of topographic effects for hyperspectral remote sensing

Aiming at geometric deformations and radiation changes caused by rugged terrain for the hyperspectral remote sensing images, a model of topographic effects for hyperspectral remote sensing was proposed. In the model, the imaging geometry relationship between simulation image pixel coordinates and ground space coordinates was established by using the sensor-s position, attitude and field of view. With the surface reflectivity, the digital elevation model(DEM) and the atmospheric radiation transfer model, the radiance image at sensor entrance slit in rugged terrain was calculated. After spatial resolution conversion the simulated remote sensing image was generated. Accurate modeling of topographic effects for hyperspectral remote sensing was achieved. Simulation was implemented to Hyperion data and other relevant data in Qulong, Tibetan. The simulation radiance image and the original radiance image show high consistent, which indicates that the fine simulation results are obtained by the proposed model.