基于ZY-3数据与MODIS数据气溶胶光学厚度反演方法对比分析

Comparative Analysis of Inversion Method of Aerosol Optical Depth Based on ZY3 Data and MODIS Data

以湖北省东部的大悟—红安一带为研究区,选用资源三号立体测绘卫星(简称ZY-3)多光谱数据与MODIS L1B级数据实现气溶胶光学厚度(AOD)反演,从而对比分析两种影像反演结果的差异性。ZY-3数据的AOD反演是在Gilabert算法的基础上增加漫反射项,选择多个暗像元,应用空间插值的方法来实现;MODIS数据的AOD反演同样采用暗像元法实现。两种卫星影像数据的反演结果显示ZY-3数据反演结果比MODIS数据的反演结果更为精细,更适合小范围地区的研究。

In this paper, the author takes the region of Da Wu - Hong An in the eastern Hubei Province as the study area, and chooses the multi-spectral data of dimensional mapping satellite named domestic resources Three （ZY-3 for short） and he MODIS L1B data are used to invert the aerosol optical depth （AOD） contrast analysis of the difference between the two images inversion results. The AOD from ZY-3 data are obtained from the Gilabert’s algorithm, which is improved by considering the diffuse reflection during the calculation process. The method mainly uses the path radiation information from the red, dark and blue band pixel to estimate the aerosol optical parameters, which is directly used for calculating the AOD values. The AOD inversion of MODIS data is also implemented by dark pixel method. The inversion results of the two satellite images show that the inversion results of the ZY-3 data are more refined than the inversion results of the MODIS data, and are suitable for the study of small areas.