典型陆表稳定目标热红外辐射特性分析及适用性评估  

Analysis of the thermal infrared radiation characteristics of a typical landsurface stable target and applicability assessments

作　　者：杨治纬 高彩霞 邱实 马灵玲 钱永刚 赵永光 YANG Zhiwei;GAO Caixia;QIU Shi;MA Lingling;QIAN Yonggang;ZHAO Yongguang(Chinese Academy of Sciences Key Laboratory of Quantitative Remote Sensing Information Technology,Chinese Academy of Sciences,Aerospace Information Research Institute,Beijing 100094,China;College of Optoelectronics,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院空天信息创新研究院,中国科学院定量遥感信息技术重点实验室,北京100094 [2]中国科学院大学光电学院,北京100049

出　　处：《遥感学报》2023年第5期1133-1149,共17页NATIONAL REMOTE SENSING BULLETIN

基　　金：国家重点研发计划(编号:2018YFB0504800,2018YFB0504804)。

摘　　要：以地面稳定目标为参考的网络化定标技术已经成为国际定标领域的研究热点。它利用多次观测的方式减小独立测量不确定性,不仅可极大提升定标校验频次,还可有效提高总体定标精度。基于此,本文利用长时间序列Aqua/MODIS和Landsat 8/TIRS热红外数据,对国际卫星对地观测委员会定标与真实性检验组6个伪不变定标场、敦煌定标场以及格尔木大灶火地区的地表热辐射及大气特性进行了系统性分析,建立了热红外陆表稳定目标甄选标准,即空间亮温标准差低于0.3 K,发射率时间变异系数低于2%,旨在甄选适用于热红外载荷网络化定标的陆表参考目标,以支持热红外载荷在轨辐射定标精度的提升。结果表明:在1 km空间尺度下满足甄选标准的区域分别为:Libya1_1 km、Libya4_1 km、Algeria3_1 km、Algeria5_1 km、Mauritania1_1 km、Mauritania2_1 km、敦煌_1 km及格尔木_1 km,其中,Libya4_1 km面积最大,为75 km×75 km;格尔木_1 km面积最小,为3 km×3 km;对于100 m空间尺度,在Libya1_1km、Mauritania1_1km、Mauritania2_1km以及敦煌_1km共甄选出7个满足阈值的区域,最大面积为30 km×30 km,最小面积为5 km×5 km;Libya1_1 km、 Mauritania1_1 km、Mauritania2_1 km以及敦煌_1 km目标区域的空间均一性受空间尺度影响较小,适用于多种空间分辨率热红外载荷定标与真实性检验。Networked calibration technology using the Earth surface with suitable characteristics as a reference has become a hot topic in the international calibration field.This technology can reduce the uncertainty of independent measurement by means of multiple observations,so calibration frequency and accuracy can be effectively improved.In this study,long-time series of Aqua/MODIS and Landsat8/TIRS thermal infrared data are used to systematically analyze the surface thermal radiation and atmospheric characteristics of eight targets,namely,six pseudo-invariant calibration sites recommended by the Committee on Earth Observation Satellites and the Working Group on Calibration&Validation,the Dunhuang site,and the Geermu Dazaohuo area.Meanwhile,a criterion for selecting land surface stable targets is proposed.Specifically,the criterion states that the spatial standard deviation of brightness temperature should be less than 0.3 K,and the emissivity temporal variation coefficient should be less than 2%so that land surface stable targets suitable for the networked calibration of thermal infrared payloads can be selected for improving the in-orbit calibration accuracy of thermal infrared payloads.To analyze the applicability of each target area at different spatial resolutions,spatial uniformity and temporal stability are evaluated at 1 km spatial resolution by using MODIS/MYD02_1KM and MODIS/MYD21 thermal infrared data,and the uniform and stable area is obtained.On this basis,spatial uniformity is evaluated at 100 and 500 m spatial resolutions by using Landsat8 thermal infrared data.Then,the uniform and stable regions are obtained at 100 and 500 m spatial resolutions.In addition,to analyze the scale characteristics,this study compares two brightness temperature SDs at 500 m spatial resolution with different features;one is the original 500 m,and the other one is downscaled from 100 m.Results show that the areas that meet the selection criteria at 1 km spatial resolution are Libya1_1 km,Libya4_1 km,Algeria3_1 km,Algeria5_1 km,

关 键 词：热红外 空间异质性 时间稳定性 MODIS Landsat 8 ECMWF 

分 类 号：P2[天文地球—测绘科学与技术]