星载激光雷达估测森林结构参数研究现状分析与展望

Current Status and Development Trend in Estimating Forest Structural Parameters with Spaceborne LiDAR

星载激光雷达系统可以覆盖机载系统难以到达的偏远地区,从机理上克服光学影像及合成孔径雷达测量的技术缺陷,为快速准确地获取林下地形、树高、生物量等森林结构参数提供了可靠的数据源。对现有的星载激光雷达技术观测体系进行综述,讨论了星载激光雷达数据估测多尺度森林结构参数的适用性,定量化分析现有星载激光雷达研究成果及存在的优缺点。最后,总结当前存在的问题,对星载激光雷达技术未来的前景和发展方向进行了展望。建议后续研究可进一步加大对反演不同森林结构参数、产品体系及标准规范、林业应用精度评价、林业用激光雷达参数设计等方面的深入研究。

The spaceborne LiDAR measurement system offers a solution by covering remote areas that are challenging to access via airborne systems.This system effectively addresses the technical limitations of optical imaging and synthetic aperture radar measurements,thereby providing a reliable data source for swiftly and accurately obtaining forest structure parameters.However,the existing review on applications of spaceborne LiDAR has a lack of analysis that measures the accuracy of forest structural parameters estimated by spaceborne LiDAR as a whole and the content of the analysis is not systematic.The existing spaceborne LiDAR technology observation system were initially reviewed,and then the applicability of spaceborne LiDAR data estimation for multi-scale forest structure parameters was explored.The current development trends,as well as the existing advantages and disadvantages of satellite-borne LiDAR were also analyzed.Finally,the current challenges and anticipates the future prospects and development directions of spaceborne LiDAR technology were summarized.The research result can serve as a valuable reference for the design and application of spaceborne LiDAR remote sensing satellites in forestry.It was suggested that further research can deepen the in-depth study on the inversion of different forest structure parameters,product systems and standard specifications,accuracy evaluation of forestry applications,and design of LiDAR parameters for forestry.