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首页> 外文会议>Lidar Remote Sensing for Environmental Monitoring VIII; Proceedings of SPIE-The International Society for Optical Engineering; vol.6681 >Modeling spaceborne lidar returns from vegetation canopies
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Modeling spaceborne lidar returns from vegetation canopies

机译：模拟植被冠层的星载激光雷达回波

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摘要

Structural and biophysical parameters of vegetation canopies, such as tree heights, biomass, vertical and horizontal heterogeneity are important factors affecting flows of energy, water, carbon and trace gases through terrestrial systems. Knowing such parameters is required to model processes associated with photosynthesis, energy transfer, and evapotranspiration at local and global scales. Monitoring vegetation canopies has long been one of the main tasks of several proposed and launched space missions. Lidar instruments have demonstrated the best potential to provide estimates of vegetation height, cover, and canopy vertical structural profiles. A spaceborne lidar would deliver such data on global scale producing the total land biomass value with the accuracy demanded by carbon-cycle and global-change modelers. This paper presents the preliminary results of a numerical model simulating signal returns of a spaceborne lidar for the assessment of land-vegetation canopy biomass. It is a part of work with the overall purpose to develop a trade-off analysis tool for a spaceborne lidar system as a payload of a land-vegetation observation space mission. An end-to-end propagation of a spaceborne lidar sensing pulse through vegetation canopies is considered by the model. It consists of the modules characterizing the laser and the receiver optical systems, satellite's orbit, atmosphere, vegetation canopies, optical filtering, and detectors. This tool can be used to evaluate the effects of instrument configurations on the retrieval of vegetation structures, and to carry out trade-off studies in the instrument design.
机译：植被冠层的结构和生物物理参数（例如树高，生物量，垂直和水平异质性）是影响能量，水，碳和微量气体通过陆地系统流动的重要因素。需要知道这些参数，才能在局部和全球范围内模拟与光合作用，能量转移和蒸散有关的过程。长期以来，监测植被冠层一直是一些拟议和发射的空间飞行任务的主要任务之一。激光雷达仪器已显示出提供植被高度，覆盖率和冠层垂直结构剖面估计值的最佳潜力。星载激光雷达将在全球范围内提供此类数据，从而以碳循环和全球变化建模者所要求的精度产生土地的总生物量价值。本文介绍了模拟星载激光雷达信号返回以评估土地植被冠层生物量的数值模型的初步结果。总的来说，这是工作的一部分，目的是开发一种用于星载激光雷达系统的权衡分析工具，以作为陆地植被观测太空任务的有效载荷。该模型考虑了星载激光雷达传感脉冲通过植被冠层的端到端传播。它由表征激光器和接收器光学系统，卫星的轨道，大气，植被冠层，光学滤波和检测器的模块组成。该工具可用于评估仪器配置对植被结构恢复的影响，并在仪器设计中进行权衡研究。

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