基于FY-2G红外卫星资料反演我国陆地区域的地表发射率  

Inversion of Land Surface Emissivity in China Based on FY-2G Infrared Satellite Data

作　　者：韩露 崔生成[1] 杨世植[1] 陆文强 石建军 赵强 Han Lu;Cui Shengcheng;Yang Shizhi;Lu Wenqiang;Shi Jianjun;Zhao Qiang(Key Laboratory of Atmospheric Optics,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei,Anhui 230031,China;Science Island Branch of Graduate School,University of Science and Technology of China,Hefei,Anhui 230031,China;School of Environment and Energy Engineering,Anhui Jianzhu University,Hefei,Anhui 230601,China)

机构地区：[1]中国科学院安徽光学精密机械研究所中国科学院大气光学重点实验室,安徽合肥230031 [2]中国科学技术大学研究生院科学岛分院,安徽合肥230031 [3]安徽建筑大学环境与能源工程学院,安徽合肥230601

出　　处：《光学学报》2019年第12期375-385,共11页Acta Optica Sinica

基　　金：十三五装备预研共用技术项目(41416030204);中国科学院战略性先导科技专项(A类)资助项目(XDA17010104);安徽省自然科学基金(1508085SQD208)

摘　　要：利用FY-2G(风云二号G星)静止气象卫星中红外和热红外通道白天/夜晚数据进行我国陆地区域地表发射率的反演。采用欧洲中期天气预报中心(ECMWF)提供的温湿度、臭氧等大气廓线数据,基于辐射传输模型MODTRAN进行遥感影像的大气校正;选用修正后的Minnaert双向反射分布函数计算中红外通道地表方向的半球反射率,基于与温度无关的热红外光谱指数(TISI),最终得到我国不同地表植被类型下白天和夜晚的地表发射率分布特征;然后选取MODIS地表发射率产品对我国陆地区域的影像进行地表发射率反演结果的验证,结果显示:白天和夜晚的地表发射率反演结果与MODIS现有地表发射率产品吻合得较好,白天热红外通道IR1、IR2地表发射率反演的绝对误差分别为-0.0057、-0.0068,均方根误差分别为0.0095、0.0103;夜晚的绝对误差分别为-0.0010、-0.0035,均方根误差分别为0.0094、0.0096。同时对同一天不同时刻的地表发射率反演结果进行分析,结果表明,夜间的地表发射率略低于白天。In this study, we present the inversion of land surface emissivity(LSE) in the China land area based on the mid-infrared and thermal infrared channel day/night data received by the FengYun-2 G(FY-2 G) geostationary meteorological satellite. The atmospheric correction of the FY-2 G data is based on MODTRAN, which is a radiation transfer model, using the atmospheric profile data, including data with respect to the temperature, humidity, and ozone, provided by the European Centre for Median-range Weather Forecast(ECMWF). The modified Minnaert’s bidirectional reflection distribution function model is used to calculate the hemispherical reflectivity of the mid-infrared channel in the surface direction. Further, the LSE distribution characteristics can be obtained with respect to the different surface vegetation types in China based on the temperature-independent thermal infrared spectral index. Finally, the LSE inversion results obtained from the images of China’s land area are verified by selecting the surface emissivity products from Moderate Resolution Imaging Spectroradiometer(MODIS). The daytime and nighttime results are observed to be in good agreement with the existing LSE products in MODIS. The absolute LSE inversion errors of the hot infrared channels 1 and 2 during daytime are-0.0057 and-0.0068, respectively, and the root mean square errors(RMSEs) are 0.0095 and 0.0103, respectively. Furthermore, the absolute LSE inversion errors of the hot infrared channels 1 and 2 during nighttime are-0.0010 and-0.0035, respectively, and the RMSEs are 0.0094 and 0.0096, respectively. Simultaneously, the LSE inversion results at different time slots on the same day are analyzed. These results indicate that the LSE at nighttime is lower than that at daytime.

关 键 词：遥感 红外 地表发射率 反演 与温度无关的热红外光谱指数 FY-2G 

分 类 号：P237[天文地球—摄影测量与遥感]