New Opportunities for Forest Remote Sensing Through Ultra-High-Density Drone Lidar

编号 030019805

推送时间 20190805

研究领域 森林经理 

年份 2019 

类型 会议 

语种 英语

标题 New Opportunities for Forest Remote Sensing Through Ultra-High-Density Drone Lidar

期 第198期

发表时间 20190504

关键词 Drone;  Global Ecosystem Dynamics Investigation (GEDI);  Lidar;  Remote sensing;  UAV; 

摘要 Current and planned space missions will produce aboveground biomass density data products at varying spatial resolution. Calibration and validation of these data products is critically dependent on the existence of field estimates of aboveground biomass and coincident remote sensing data from airborne or terrestrial lidar. There are few places that meet these requirements, and they are mostly in the northern hemisphere and temperate zone. Here we summarize the potential for low-altitude drones to produce new observations in support of mission science. We describe technical requirements for producing high-quality measurements from autonomous platforms and highlight differences among commercially available laser scanners and drone aircraft. We then describe a case study using a heavy-lift autonomous helicopter in a temperate mountain forest in the southern Czech Republic in support of calibration and validation activities for the NASA Global Ecosystem Dynamics Investigation. Low-altitude flight using drones enables the collection of ultra-high-density point clouds using wider laser scan angles than have been possible from traditional airborne platforms. These measurements can be precise and accurate and can achieve measurement densities of thousands of points m(-2). Analysis of surface elevation measurements on a heterogeneous target observed 51days apart indicates that the realized range accuracy is 2.4cm. The single-date precision is 2.1-4.5cm. These estimates are net of all processing artifacts and geolocation errors under fully autonomous flight. The 3D model produced by these data can clearly resolve branch and stem structure that is comparable to terrestrial laser scans and can be acquired rapidly over large landscapes at a fraction of the cost of traditional airborne laser scanning.

服务人员 付贺龙

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