综合利用环境星CCD和红外数据反演大气气溶胶光学厚度

Aerosol optical depth determined by integration of the HJ CCD and IRS data

采用遥感技术监测大气气溶胶可实现整个研究区域的全覆盖,对区域生态环境的研究具有十分重要的意义.环境与灾害监测预报小卫星于2008年9月6日成功发射,是我国第一个专门用于环境与灾害监测预报的小卫星星座,较目前常用于反演大气气溶胶光学厚度(AOD)的遥感数据源具有一定时间分辨率和空间分辨率的优势.为了促进环境星在陆地气溶胶监测领域的应用,提出一种综合利用环境星同台获取的CCD和红外(1.6μm)数据反演AOD的方法,该方法利用CCD近红外波段和AFRI植被指数提取非阴影区域浓密植被为暗目标像元、通过6S模型模拟来构建查找表、基于暗目标像元红和蓝波段地表反射率具有较好的线性关系这一原理反演AOD.反演结果误差分析表明该方法比较稳定和可靠,反演结果合理.

Monitoring of aerosols in a large-region can be achieved by remote sensing, which is very important to the re- gional ecology and environment study. Data obtained from environment and disaster monitoring and forecasting satellite, which was launched in September 2008, has the advantages of high temporal resolution and spatial resolution in compari- son with the common remote sensing data which are used to estimate AOD like TM, MODIS and so on. In order to pro- mote the application of HJ data in land aerosol area, a method combining the HJ CCD data and IRS （ a sensor which is also carried by HJ satellite） 1.6 ixm data to estimate AOD was presented.