高分辨率中红外遥感（3-5μm）成像模拟中邻近效应分析

ADJACENCY EFFECT ANALYSIS IN IMAGING SIMULATION OF HIGH-RESOLUTION MID-INFRARED （ 3 - 5 μm） REMOTE SENSING

在星载高分辨率遥感成像模拟中,需要重点考虑大气辐射传输过程.通常情况下,中红外波段大气多次散射作用可以忽略,但在高分辨率中红外遥感成像中却需对由多次散射产生的邻近效应加以适当考虑.为对其进行定量分析,分别将影响中红外邻近效应的地表、大气及卫星观测几何参量等进行分析,结果表明:邻近效应随像元测量条件而改变,且在正常条件下其贡献达到3%左右.通过将现有大气点扩散函数(PSF)解析算法扩展至中红外波段,建立了中红外像元邻近效应模型,将其与大气辐射传输模型进行耦合,共同实现大气辐射传输与邻近效应模拟.模拟结果表明,模型是正确的,且应用方法切实可行;对中红外大气校正、成像模拟均具有一定参考价值.

During the simulation of high-resolution remote sensing image, it is necessary to focus on the process of atmospheric radiative transfer. Generally, the role of multiple scattering of atmosphere may be neglected. However, it should be taken into account for high resolution middle infrared remote sensing. So, adjacency effects generated by neighbor pixels need to be properly considered. In order to give a quantitative analysis, the calculations of contribution of adjacency effect according to the different impact factors （ land surface emissitity/temperature, atmosphere conditions and satellite observations geometric parameters et al. ） were carried out by turn. The results show that the adjacency effect changes with the measuring conditions and it can change about 3% under normal conditions. By an extended atmospheric point spread function （PSF） analytic algorithm, a model of adjacency effect in mid-infrared was created and was coupled with the atmospheric radiative transfer model to simulate atmospheric radiative process and adjacency effect. The simulation results show that the model is correct and practical; and it is also a helpful reference to mid-infrared atmospheric correction.