基于MODIS卫星遥感数据的大气气溶胶光学厚度优选反演方法  

A Retrieval Method for Atmospheric Aerosol Optical Depth Based on MODIS Satellite Remotely Sensed Data

作　　者：徐梦溪[1] 许宝华[2] 郑胜男[1] 刘翔龙[3] 石爱业[3] 

机构地区：[1]南京工程学院计算机工程学院,江苏南京211167 [2]水利部长江水利委员会长江口水文水资源勘测局,上海200136 [3]河海大学计算机与信息学院,江苏南京211100

出　　处：《南京工程学院学报（自然科学版）》2013年第2期1-7,共7页Journal of Nanjing Institute of Technology(Natural Science Edition)

基　　金：国家自然科学基金(61271386);江苏省高校科研成果产业化推进工程项目(JH10-9);南京工程学院青年基金重点项目(QKJA201204)

摘　　要：通过地面大气气溶胶的测定,可以反映大气浑浊度,进而在某种程度上确定区域的气候效应,其中关键技术是大气气溶胶光学厚度的反演.目前使用的卫星遥感气溶胶光学厚度反演算法中,扩展暗像元法精度较低而V5.2法适用范围较窄.提出了一种优选反演法,通过引入中红外通道表观反射率来选择扩展暗像元法或V5.2法.其中,在V5.2法中添加了Walthall双向反射分布订正.实验对比了相关方法反演的气溶胶光学厚度数据,结果表明所提方法可以弥补扩展暗像元法和V5.2算法各自的不足.By monitoring the atmospheric aerosol which reflects atmosphere turbidity, we can determine the regional climate effects to some extent. In the process of monitoring, a key technology is the retrieval of the Aerosol Optical Depth （AOD）. In the existing algorithms for satellite remote sensing AOD retrieval, the Extended Dark Target Algorithm＇s accuracy is lower and V5.2 Algorithm has narrow applying scope. This paper proposes an optimized retrieval method which, according to the Mid-infrared channel apparent reflectance, chooses a better one from the above-mentioned Algorithms. In addition, we modify V5.2 Algorithm using the Walthall Bidirectional Reflectance Distribution Function （BRDF）. The experiments compare the data of AOD, and the results show that the proposed method can modify both Extended Dark Target Method and VS. 2 Algorithm effectively.

关 键 词：MODIS 气溶胶光学厚度 扩展暗像元法 V5 2算法 Walthall双向反射分布 

分 类 号：TP751.1[自动化与计算机技术—检测技术与自动化装置]