基于无人机热红外遥感和大气同步廓线的地表温度反演方法  

Land Surface Temperature Retrieval Method Based on UAV Thermal Infrared Remote Sensing and Synchronized Atmospheric Profiles

作　　者：吉蒙 徐永明 莫亚萍 张杨 周睿禹 祝善友 JI Meng;XU Yongming;MO Yaping;ZHANG Yang;ZHOU Ruiyu;ZHU Shanyou(School of Remote Sensing and Geomatics Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学遥感与测绘工程学院,南京210044

出　　处：《地球信息科学学报》2023年第12期2456-2467,共12页Journal of Geo-information Science

基　　金：国家自然科学基金项目(42271351、42171101)。

摘　　要：地表温度是表征局地热环境的关键地表参数。无人机热红外遥感具有高空间分辨率的优点,为获取高分辨率局地地表温度提供了数据支撑,基于无人机热红外遥感数据的地表温度反演已吸引越来越多的关注。本文系统探索了基于同步大气温湿度廓线的无人机热红外遥感地表温度反演方法,以南京信息工程大学中苑校园及周边地区为研究区,利用无人机搭载WIRIS Pro Sc热像仪和温湿度观测系统同时获取热红外影像和大气温湿度廓线数据,在消除大气影响的基础上,结合地物比辐射率反演得到高精度的地表温度,利用修正后的实测地面点温度数据对地表温度反演结果进行验证,基于反演得到的地表温度分析其空间分布特征。结果表明,基于温湿度传感器获取的同步大气温湿度廓线,可以有效去除大气影响得到准确的离地辐射亮度,反演得到的地表温度与实测地表温度的温度差为0.06~4.96 K之间,R2为0.91,地表温度空间差异明显,其空间分布与地表覆盖类型密切相关,反演结果较为准确。研究为无人机热红外遥感数据的地表温度反演研究提供了借鉴与参考,并能够为局地微热环境监测提供技术支撑。s:Land surface temperature is one of the important land surface parameters that characterizes the local thermal environment.Unmanned Aerial Vehicle(UAV)thermal infrared remote sensing has the advantage of high spatial resolution,which provides data support for obtaining high-resolution local land surface temperature data.In recent years,how to accurately retrieve the surface temperature based on UAV thermal infrared remote sensing data has attracted great attention.This paper systematically explores the method of retrieving land surface temperature from UAV thermal infrared remote sensing data and synchronized atmospheric vertical profile data.We collected the UAV thermal infrared images and atmospheric vertical profile data simultaneously within the central campus of Nanjing University of Information Science and Technology and its surrounding area using the UAV-based WIRIS Pro Sc thermal imager and temperature and humidity sensor.To obtain the accurate land surface thermal radiance,the atmospheric influence on the UAV thermal infrared images was eliminated by calculating the atmospheric downward thermal radiation,upward thermal radiation,and atmospheric transmittance.Land cover data were generated from UAV multispectral data,and then the land surface emissivity was calculated based on the land cover data and emissivity spectrum library.Finally,the land surface temperature was retrieved based on the land surface thermal radiance and surface emissivity.The retrieved land surface temperature was validated by comparing with the corresponding measured land surface temperature after corrections.We also analyzed the spatial pattern of the UAV land surface temperature and the factors that affect surface temperature retrieval.The results showed that the use of synchronized temperature and humidity profiles can effectively remove atmospheric effects,ensuring accuracy of off-ground radiance measurements under varying water vapor conditions.Our retrieval method can effectively retrieve surface temperature from UAV thermal i

关 键 词：地表温度 反演 辐射传输 无人机 热像仪 同步大气廓线 WIRIS Pro Sc IBUTTON 

分 类 号：P407[天文地球—大气科学及气象学]