摘要
针对陆地遥感影像,提出一种利用MODIS遥感数据反演高分辨率气溶胶光学厚度(AOD)进行大气效应校正的方法。采用地基和MODIS卫星遥感结合的方法确定气溶胶模型,通过暗目标法确定地表反射率,反演得到1km高分辨率的气溶胶光学厚度分布。将反演的气溶胶与地面太阳光度计观测值进行对比验证发现,其相对误差小于10%,反演精度很高。将得到的气溶胶参数带入辐射传输模型中,对当天同地区的Landsat ETM+数据进行大气校正试验,结果表明,该方法反演得到的气溶胶参数可以对遥感图像进行有效的大气效应校正。与试验区同步观测地表反射率对比发现,经过大气校正后的ETM+光谱明显比校正前更接近真实地表光谱,从而更有助于地物真实光谱信息的提取及其识别研究。
Atmospheric correction is an important step to extract quantitative information from remote sensing data.An atmospheric correction method with the 1-km resolution aerosol optical depth retrieved from MODIS data is developed,in order to correct the remote sensing image over land.To retrieve aerosol optical depth（AOD） at 1-km resolution over the test site,the sun-photometer observations combining with MODIS data are used to determine the aerosol model,the dark target is selected and the ground surface reflectance is calculated.Comparing the retrieval result with sun-photometer observations,it is found that the relative error of these products is about 10%.Then atmospheric correction has been applied to Landsat ETM＋ imagery by using Radiation Transfer Model with the retrieval AOD.The experiments indicate that this method is efficient.Compared with original data,the atmospheric corrected ETM＋ spectrum is closer to measured typical objects spectrum,so it is more conducive to extracting ground object spectrum information and target identification.
出处
《地理与地理信息科学》
CSSCI
CSCD
北大核心
2010年第4期12-15,41,F0002,共6页
Geography and Geo-Information Science
基金
国家高技术研究发展计划(863计划)重点项目(2008AA121806)
