静止轨道高光谱热红外时谱信息联合的地表温度一体化反演方法研究

Land surface temperature and emissivity are important parameters in the earth surface system and play the key roles in the field of accurately understanding the process of surface energy balance. Because the geostationary orbit has the advantage of continuously observing the certain place, this project attempts to take the express of technical revolution of geostationary orbit for hyperspectral thermal infrared data. Under the background of the launch of the geostationary orbit FengYun-4 satellite of our country, which carries the first hyperspectral thermal infrared sensor in the world, we try to break through the limitation of relying on the prior knowledge in the traditional methods of land surface temperature and emissivity retrieval, explore the hidden information from the geostationary orbit satellite time-series data, and make full use of the abundant spectral information provided by hyperspectral thermal infrared data, to develop a physics-based simultaneous retrieval algorithm of land surface temperature, emissivity and atmospheric comprehensive contribution factor, with the characteristic analysis, model building, and the iterative optimization solution as the main steps. The aim of this project is to improve the accuracy and frequency of land surface temperature and emissivity retrievals and meet the application requirements of national ecological environment resources investigation and monitoring. What is more, this study can provide the technical reserves for the further development of earth observation technology on the base of geostationary orbit hyperspectral thermal infrared data.

地表温度和发射率是地球表层系统中非常重要的物理参数，对于精确理解地表能量平衡等研究具有重要意义。鉴于静止轨道有连续凝视观测某一区域的巨大优势，本项目试图抢搭静止轨道高光谱热红外技术革命的快车，力争在我国风云四号卫星首次在国际上实现静止轨道高光谱对地探测的大背景下，突破传统地表温度遥感反演较为依赖先验知识的技术壁垒，充分挖掘静止轨道卫星时序数据中蕴含的知识，结合高光谱热红外数据提供的丰富谱段信息，以特性分析、模型构建、迭代优化求解为研究主线，建立地表温度、地表发射率以及大气综合贡献的一体化物理反演方法，实现无外部辅助信息条件下的大气和地表信息解耦，提高地表温度和发射率遥感反演的精度和频次，满足国家生态环境资源调查和监测等相关行业应用的需求，为静止轨道高光谱热红外对地观测技术的发展提供科技支撑和技术储备。

地表温度和发射率是地球表层系统中非常重要的物理参数，对于精确理解地表能量平衡等研究都具有重要意义。本项目突破了传统地表温度遥感反演较为依赖先验知识的不足，开展了静止轨道高光谱热红外地表温度一体化反演方法研究，形成了一套完整的精度可靠的静止轨道高光谱热红外地表温度一体化反演理论与方法，获得了一批配套的地面验证的实测数据，建立了红外谱段交叉验证真实性检验方法，发表了SCI论文6篇，EI论文5篇，授权国家发明专利2项，培养博士生1名以及硕士生2名，撰写了年度总结报告和项目总结报告，全面完成了预定的研究目标和研究内容，满足了国家生态环境资源调查和监测等相关行业应用的需求，为静止轨道高光谱热红外对地观测技术的发展提供科技支撑和技术储备。