气候变化领域集成服务门户(CCPortal): Direct estimation of photon recollision probability using terrestrial laser scanning

CCPortal

DOI	10.1016/j.rse.2020.111932
	Direct estimation of photon recollision probability using terrestrial laser scanning
	Wang D.; Schraik D.; Hovi A.; Rautiainen M.
发表日期	2020
ISSN	00344257
卷号	247
英文摘要	Photon recollision probability p is a spectrally invariant structural parameter and a powerful tool to link canopy optical properties at any wavelengths to model reflectance, transmittance, or absorption of vegetation canopies. The concepts of the p-theory have been reported and examined at the shoot and canopy scales, but not yet for the crown level. Currently, the p-value is estimated indirectly, such as converted from the spherically averaged silhouette to total area ratio (STAR¯) or canopy transmittance measurements. In this work, we first validate the theoretical considerations of the p concept at the crown level (e.g., its relationship with STAR¯), and then provide the first method to directly estimate photon recollision probability using Terrestrial Laser Scanning (TLS) data. The proposed geometric method is data-driven and avoids explicit reconstructions of tree structures. The p-value estimated here is the average recollision probability over spatial locations. We showed that the average recollision probability can be interpreted as the local spherical openness on phytoelement (leaf or needle) surfaces, which enabled a simple visibility calculation by avoiding explicit ray tracing. The developed method was tested on synthetic crowns of needle-leaved tree species, for which the reference p-values were known. Results confirmed the validity of the p-STAR¯ relationship at the crown level, and showed that p-values can be accurately estimated from TLS point clouds with a relative root measure square error of less than 10%. This study displays the distinct advantage of TLS in delineating detailed tree crown structures and highlights its potential in studies of forest reflectance modeling. © 2020 The Author(s)
英文关键词	3D model; Photon recollision probability; Spectral invariants; Sphere covering; Terrestrial LiDAR
语种	英语
scopus关键词	Forestry; Laser applications; Needles; Optical properties; Photons; Probability; Reflection; Seebeck effect; Stars; Steel beams and girders; Averaged silhouettes; Canopy transmittance; Forest reflectance model; Photon recollision probability; Recollision probability; Structural parameter; Terrestrial laser scanning; Visibility calculation; Surveying instruments; estimation method; laser method; probability; spectral analysis; spectral reflectance; transmittance
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179249
作者单位	Department of Built Environment, School of Engineering, Aalto University, Finland; Department of Electronics and Nanoengineering, School of Electrical Engineering, Aalto University, Finland
推荐引用方式 GB/T 7714	Wang D.,Schraik D.,Hovi A.,et al. Direct estimation of photon recollision probability using terrestrial laser scanning[J],2020,247.
APA	Wang D.,Schraik D.,Hovi A.,&Rautiainen M..(2020).Direct estimation of photon recollision probability using terrestrial laser scanning.Remote Sensing of Environment,247.
MLA	Wang D.,et al."Direct estimation of photon recollision probability using terrestrial laser scanning".Remote Sensing of Environment 247(2020).