光学载荷定标场比辐射率方向性模型构建  

Research on emissivity directionality of radiometric calibration sites for optical sensors

作　　者：刘佳欣 杨治纬 高彩霞 马慧雅 赵恩宇 段四波[5] LIU Jia-Xin;YANG Zhi-Wei;GAO Cai-Xia;MA Hui-Ya;ZHAO En-Yu;DUAN Si-Bo(National Engineering Laboratory for Satellite Remote Sensing Applications,Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;Xinjiang Transportation Planning Survey and Design Institute,Urumqi 830006,China;University of Chinese Academy of Sciences,Beijing 100049,China;College of Information Science and Technology,Dalian Maritime University,Dalian 116026,Liaoning,China;Key Laboratory of Agri-informatics,Ministry of Agriculture/Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081,China)

机构地区：[1]中国科学院空天信息创新研究院遥感卫星应用国家工程实验室,北京100094 [2]新疆维吾尔自治区交通规划勘察设计研究院,乌鲁木齐830006 [3]中国科学院大学,北京100049 [4]大连海事大学信息科学技术学院,辽宁大连116026 [5]中国农业科学院农业资源与农业区划研究所农业部农业信息技术重点实验室,北京100081

出　　处：《红外与毫米波学报》2023年第5期687-700,共14页Journal of Infrared and Millimeter Waves

基　　金：国家自然科学基金(42271395)。

摘　　要：地表比辐射率方向性研究是国际热红外定量遥感研究领域的热点与难点,现有的热红外沙地比辐射率方向性模型存在先验参数较多、精度较低、适用性差等问题。论文基于5个伪不变定标场,即Algeria3_1km、Algeria5_1km、Libya1_1km、Mauritania1_1km及Mauritania2_1km,综合利用长时序极轨卫星载荷AQUA/MODIS与静止轨道卫星载荷MSG/SEVIRI多角度观测数据,经过载荷相互校准、大气纠正、影像数据时空匹配等处理,基于热红外辐射传输方程,获取0~65°观测天顶角范围内各研究区方向性比辐射率,建立公里级像元尺度比辐射率方向性模型,并对其进行了不确定度评估。结果表明:地表比辐射率随观测天顶角增大而降低,其方向性效应随波段中心波长的增加而减小,Algeria5_1km区域的方向性效应最小,Mauritania1_1km区域的方向性效应最强;各研究区比辐射率方向性模型不确定度均随观测天顶角的增大而增大,模型不确定度均优于3%。The research on the surface emissivity directionality is a hot and difficult issue in the international thermal infrared quantitative remote sensing area.The existing emissivity directional models for sandy area in thermal infrared bands have some disadvantages,such as too many prior parameters,low accuracy and poor applicability.Therefore,with the aid of long-time series(2018-2020)multi-angle observations from geostationary-orbit MSG/SEVIRI and polar-orbit AQUA/MODIS,after data pre-processing related to inter-sensor calibration,atmospheric correction,spatial and temporal matching,we retrieved the directional emissivity under different viewing zenith angles(VZAs)between 0~65°over five pseudo-invariant calibration sites based on the thermal infrared radiation transfer equation,including Algeria3_1km,Algeria5_1km,Libya1_1km,Mauritania1_1km and Mauritania2_1km.Subsequently,a model for retrieving the kilometer-scale directional emissivity was established,and its uncertainty was evaluated.The result shows that the surface emissivity decreases with the increase in VZA,and the directional effect decreases with the increase in the MODIS band central wavelength;Algeria5_1km has the smallest directional effect,and Mauritania1_1km has the strongest ef‐fect,the uncertainty of the directional emissivity model in each region increases with VZA,and is better than 3%.

关 键 词：热红外遥感 地表比辐射率 方向性模型 误差传递理论 

分 类 号：TP722.5[自动化与计算机技术—检测技术与自动化装置]