地球科学进展 ›› 2025, Vol. 40 ›› Issue (1): 99 -110. doi: 10.11867/j.issn.1001-8166.2025.003

表层地球 上一篇    

星载被动微波亮温影像轨道间隙填补:进展与展望
王永杰1(), 张晓东2, 唐文彬1, 赵少杰3, 马晋1, 孟义真1, 王子卫1, 周纪1()   
  1. 1.电子科技大学 资源与环境学院,四川 成都 611731
    2.上海航天测控通信研究所,上海 201109
    3.北京师范大学 地表过程与资源生态国家重点实验室,北京 100875
  • 收稿日期:2024-04-22 修回日期:2024-11-29 出版日期:2025-01-10
  • 通讯作者: 周纪 E-mail:yjwang123@std.uestc.edu.cn;jzhou233@uestc.edu.cn
  • 基金资助:
    国家自然科学基金项目(42271387)

Orbital Gap Filling for Satellite Passive Microwave Brightness Temperature Images: Progress and Prospects

Yongjie WANG1(), Xiaodong ZHANG2, Wenbin TANG1, Shaojie ZHAO3, Jin MA1, Yizhen MENG1, Ziwei WANG1, Ji ZHOU1()   

  1. 1.School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 611731, China
    2.Shanghai Spaceflight Institute of TT&C and Telecommunication, Shanghai 201109, China
    3.State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China
  • Received:2024-04-22 Revised:2024-11-29 Online:2025-01-10 Published:2025-03-24
  • Contact: Ji ZHOU E-mail:yjwang123@std.uestc.edu.cn;jzhou233@uestc.edu.cn
  • About author:WANG Yongjie, research areas include the retrieval of all-weather land surface temperature and gap filling of passive microwave brightness temperature images. E-mail: yjwang123@std.uestc.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(42271387)

被动微波亮度温度是反演多种地表参量的关键基础数据。极轨卫星搭载的被动微波成像仪获得的被动微波亮温影像在相邻轨道之间存在因轨道间隙导致的观测缺失。填补轨道间隙有利于提高基于亮温生成的次生产品的时空完整性、增强其应用潜力。通过回顾被动微波辐射传输理论、轨道间隙形成原因及其影响,针对基于多源数据填补与基于有效源数据重构这两类遥感数据缺失值填补方法进行了总结,分析了其应用于被动微波亮温影像轨道间隙填补的前景。在梳理被动微波亮温轨道间隙填补的相关研究与存在的问题时,发现目前已有针对星载被动微波亮温轨道间隙填补的研究较少且均使用了多源数据,传感器的差异导致这类方法普适性不高。总结了当前研究所面临的挑战,从使用再分析资料和时间序列建模的角度,探讨了在考虑特殊下垫面情况下,构建具有良好普适性的高精度统一重构方法的未来方向。

Passive Microwave Brightness Temperature (PMWBT) is crucial for retrieving various land surface parameters. However, PMWBT images often exhibit many missing observations, particularly in low-latitude areas, owing to the limited coverage of polar-orbit satellites equipped with PMW radiometer imagers. Filling these gaps is essential to enhance the spatiotemporal integrity and application potential of PMW-derived products. To better understand the problem and propose solutions, the PMW radiative transfer theory and the reasons for the observation gaps are comprehensively reviewed. Subsequently, two filling approaches, multi-source data filling and effective data reconstruction, which are commonly used in remote sensing, were introduced and assessed for their suitability in filling PMWBT gaps. Upon reviewing related research and existing issues in filling PMW BT orbital gaps, it was observed that current studies on filling satellite-borne passive microwave brightness temperature orbital gaps are limited, and all use multi-source data with low generalizability because of sensor differences. In conclusion, the current research status and challenges are succinctly summarized. Furthermore, from the perspective of using reanalysis data and time-series modeling, the construction of a high-precision, general reconstruction method under special underlying surface conditions was explored.

中图分类号: 

表1 星载被动微波成像仪
Table 1 Space-borne passive microwave radiometer imager
图1 202061AMSR2全球亮温影像
产品:L3;通道:7 GHz垂直极化;白色区域表示轨道间隙
Fig. 1 Global Brightness TemperatureBTimage from AMSR2 on June 12020
Product: L3; Channel: 7 GHz vertical polarization; White areas represent orbital gaps
图2 FY-3G MWRI-RM圆锥扫描示意图(资料来源:http://satellite.nsmc.org.cn/
Fig. 2 Conical scanning of FY-3G MWRI-RMdata sourcehttp://satellite.nsmc.org.cn/
表2 2020AMSR2全球不同纬度地区被动微波亮温缺失情况
Table 2 The missing percentage of AMSR2 passive microwave brightness temperature according to different latitude in 2020
图3 2020AMSR2亮温数据缺失比例空间分布图
Fig. 3 The spatial distribution map of the missing ratio of AMSR2 brightness temperature in 2020
图4 中低纬度地区某像元2020年逐日亮温时间序列
像元中心:25.85°N、103.15°E;折线不连续处为观测缺失Pixel location: 25.85°N, 103.15°E; Discontinuities in the lines indicate missing observations
Fig. 4 The BT daily time series of mid-low latitude pixel in 2020
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