sUAS for 3D Tree Surveying: Comparative Experiments on a Closed-Canopy Earthen Dam

编号 030029504

推送时间 20210614

研究领域 森林经理 

年份 2021 

类型 期刊 

语种 英语

标题 sUAS for 3D Tree Surveying: Comparative Experiments on a Closed-Canopy Earthen Dam

来源期刊 Forests

期 第295期

发表时间 20210522

关键词 sUAS;  personal remote sensing;  point cloud;  watershed segmentation;  3D tree inventory; 

摘要 Defined as “personal remote sensing”, small unmanned aircraft systems (sUAS) have been increasingly utilized for landscape mapping. This study tests a sUAS procedure of 3D tree surveying of a closed-canopy woodland on an earthen dam. Three DJI drones—Mavic Pro, Phantom 4 Pro, and M100/RedEdge-M assembly—were used to collect imagery in six missions in 2019–2020. A canopy height model was built from the sUAS-extracted point cloud and LiDAR bare earth surface. Treetops were delineated in a variable-sized local maxima filter, and tree crowns were outlined via inverted watershed segmentation. The outputs include a tree inventory that contains 238 to 284 trees (location, tree height, crown polygon), varying among missions. The comparative analysis revealed that the M100/RedEdge-M at a higher flight altitude achieved the best performance in tree height measurement (RMSE = 1 m). However, despite lower accuracy, the Phantom 4 Pro is recommended as an optimal drone for operational tree surveying because of its low cost and easy deployment. This study reveals that sUAS have good potential for operational deployment to assess tree overgrowth toward dam remediation solutions. With 3D imaging, sUAS remote sensing can be counted as a reliable, consumer-oriented tool for monitoring our ever-changing environment.

服务人员 付贺龙

服务院士 唐守正

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