气候变化领域集成服务门户(CCPortal): A comparative assessment of the vertical distribution of forest components using full-waveform airborne, discrete airborne and discrete terrestrial laser scanning data

CCPortal

DOI	10.1016/j.foreco.2020.118268
	A comparative assessment of the vertical distribution of forest components using full-waveform airborne, discrete airborne and discrete terrestrial laser scanning data
	Crespo-Peremarch P.; Fournier R.A.; Nguyen V.-T.; van Lier O.R.; Ruiz L.Á.
发表日期	2020
ISSN	0378-1127
卷号	473
英文摘要	Laser scanning has the potential to accurately detect the vertical distribution of forest vegetative components. However, limitations are present and vary according to the system's platform (i.e., terrestrial or airborne) and recording method (i.e., discrete return or full-waveform). Terrestrial configurations detect close objects (i.e., lower vegetation strata) in more detail while airborne configurations detect a more detailed upper strata, with weak backscattered signals from lower strata. Moreover, discrete lidar systems record single or multiple hits from a given pulse at intercepted features in contrast to full-waveform systems, which register the pulse's complete backscattered signal providing complete vertical profiles. In this study, we examine for a boreal and a Mediterranean forest with contrasted conifer canopy densities: (i) the characterization of the vertical distribution and signal occlusion from three laser scanning configurations: full-waveform airborne (ALSFW), discrete airborne (ALSD), and discrete terrestrial (TLS); (ii) the comparison in the detection of understory vegetation by ALSFW and ALSD using TLS as reference; and (iii) the use of a methodological procedure based on the Gini index concept to group understory vegetation in density classes from both ALSFW and ALSD configurations. Our results demonstrate, firstly, that signal occlusion can be quantified by the rate of pulse reduction independently for data from all three laser scanning configurations. The ALSD configuration was the most affected by signal occlusion, leading to weak signal returns at the lower strata (z < 4 m) where the rate of pulse reduction was highest as a result of dense canopy covers. Secondly, we demonstrated the capabilities for both airborne laser scanning configurations to detect understory vegetation, albeit significantly more accurately with ALSFW. Lastly, we demonstrated the use of the Gini index as an indicator to determine understory vegetation density classes, particularly for ALSFW data in dense canopy cover. We proceed to explain the limitations in detecting the vertical distribution from different configurations, and indicate that understory vegetation density classes may be successfully assigned with ALSFW in contrasted conifer canopy densities. © 2020
英文关键词	boreal forest; Gini index; Lidar; Mediterranean forest; Occlusion; Understory vegetation
语种	英语
scopus关键词	Electromagnetic wave backscattering; Forestry; Laser applications; Object detection; Scanning; Vegetation; Airborne Laser scanning; Backscattered signal; Comparative assessment; Mediterranean forest; Terrestrial laser scanning; Understory vegetation; Vertical distributions; Vertical profile; Surveying instruments; airborne survey; assessment method; boreal forest; comparative study; coniferous tree; laser method; lidar; satellite data; understory; vegetation type; vertical distribution; Data; Density; Distribution; Forestry; Plants; Reduction; Scanning; Mediterranean Region; Coniferophyta
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/155161
作者单位	Geo-Environmental Cartography and Remote Sensing Group (CGAT), Department of Cartographic Engineering, Geodesy and Photogrammetry, Universitat Politècnica de València, Camí de Vera s/n, València, 46022, Spain; Department of Applied Geomatics, Centre d'applications et de recherché en télédétection, Université de Sherbrooke, 2500 boul. de l'université, Sherbrooke, QC J1K 2R1, Canada; Natural Resources Canada, Canadian Forest Service – Canadian Wood Fibre CentreNL A2H 5G4, Canada
推荐引用方式 GB/T 7714	Crespo-Peremarch P.,Fournier R.A.,Nguyen V.-T.,et al. A comparative assessment of the vertical distribution of forest components using full-waveform airborne, discrete airborne and discrete terrestrial laser scanning data[J],2020,473.
APA	Crespo-Peremarch P.,Fournier R.A.,Nguyen V.-T.,van Lier O.R.,&Ruiz L.Á..(2020).A comparative assessment of the vertical distribution of forest components using full-waveform airborne, discrete airborne and discrete terrestrial laser scanning data.Forest Ecology and Management,473.
MLA	Crespo-Peremarch P.,et al."A comparative assessment of the vertical distribution of forest components using full-waveform airborne, discrete airborne and discrete terrestrial laser scanning data".Forest Ecology and Management 473(2020).