MRI: Development of a Dual-Wavelength, Ground-Based, Echidna® Lidar (DWEL) for Structural Characterization and Virtual Reconstruction of Forest Canopies

MRI：开发双波长、地基 Echidna® 激光雷达 (DWEL)，用于森林冠层的结构表征和虚拟重建

• 批准号: 0923389
• 负责人: Alan Strahler
• 金额: $ 116.37万
• 依托单位: Trustees of Boston University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-15 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0923389&HistoricalAwards=false
• 关键词: MRI; Development; Dual; Wavelength; Ground

This Major Research Instrumentation (MRI) award funds the development of a new, ground-based, scanning lidar field instrument, the Dual-Wavelength Echidna Lidar (DWEL), that will measure forest canopy structural parameters and provide 3-D reconstructions of forests for a variety of ecological and ecosystem applications. DWEL will simultaneously scan the forest canopy from below in two wavelengths: 1064 nm and near 1540 nm. At 1064 nm, most targets in forests (leaves, branches, trunks, leaf litter, soil) have similar reflectances in the range 0.4-0.6. At 1540 nm, however, leaves and photosynthetic materials are significantly darker than wood and branches. Accordingly, DWEL will more easily separate leaves from stems and branches, enhancing the accuracy of leaf area index and foliage profile retrievals. 3-D reconstructions, coupled with the dual wavelength capability, also open the door to direct measurements of volumes of trunks, branches, and leaves to estimate both green and woody biomass without allometric equations. The development of the DWEL will explore the use of 3-D visualization in college teaching in environmental biology, train undergraduates and graduates in instrumentation development, and explore opportunities for unique visualization in environmental education of secondary school students. Results from this study will be disseminated by students and faculty at regional and national meetings, and through the publication of peer-reviewed journal publications.

该主要研究仪器（MRI）奖资助开发一种新的地面扫描激光雷达现场仪器，双波长Echidna激光雷达（DWEL），该仪器将测量森林冠层结构参数，并为各种生态和生态系统应用提供森林的三维重建。DWEL将同时扫描森林树冠从下面在两个波长：1064纳米和近1540纳米。在1064 nm处，森林中的大多数目标（树叶、树枝、树干、落叶、土壤）具有在0.4-0.6范围内的类似反射率。然而，在1540 nm处，叶片和光合物质比木材和树枝显着更暗。因此，DWEL将更容易从茎和枝中分离出叶，从而提高叶面积指数和叶剖面检索的准确性。3D重建加上双波长功能，还为直接测量树干、树枝和树叶的体积打开了大门，以在没有异速生长方程的情况下估计绿色和木质生物量。DWEL的开发将探索在环境生物学的大学教学中使用三维可视化，培养本科生和研究生的仪器开发，并探索在中学生环境教育中使用独特可视化的机会。 这项研究的结果将由学生和教师在区域和国家会议上传播，并通过出版同行评审的期刊出版物。