气候变化领域集成服务门户(CCPortal): Multi-angular reflectance spectra of small single trees

CCPortal

DOI	10.1016/j.rse.2021.112302
	Multi-angular reflectance spectra of small single trees
	Forsström P.R.; Hovi A.; Ghielmetti G.; Schaepman M.E.; Rautiainen M.
发表日期	2021
ISSN	00344257
卷号	255
英文摘要	Understanding the reflectance anisotropy of forests and the underlying scattering mechanisms is needed to improve the accuracy of retrievals of fundamental forest characteristics from optical remote sensing data. In this paper, we developed a laboratory measurement set-up for a large goniometer (LAGOS) and measured multi-angular spectra (350–2500 nm) of 18 small trees, composed of three common European tree species: Scots pine (Pinus sylvestris L.), Norway spruce (Picea abies (L.) H. Karst), sessile oak (Quercus petraea (Matt.) Liebl.). For all trees, we measured tree spectra in 47 view angles in the upper hemisphere. To our knowledge, this is the first study reporting multi-angular reflectance spectra of single trees. We also measured the reflectance and transmittance spectra of needles and leaves, as well as reflectance spectra of bark of the sample trees. We analyzed the spectro-directional characteristics of the trees, and the inter- and intraspecific variations of these characteristics. The anisotropy of trees was shown to be strongly asymmetrical and characteristic to species: while pine and spruce exhibited strong hotspot effects, oak showed a strong specular component. Our results indicate that simultaneous measurements of both spectral and directional characteristics of trees may enhance the discrimination of species and thus, support the retrieval of information of their biophysical properties. © 2021 The Author(s)
英文关键词	Anisotropy; Goniometer; Oak; Pine; Scattering; Spruce; Tree spectrum
语种	英语
scopus关键词	Anisotropy; Plants (botany); Reflection; Remote sensing; Spectrum analysis; Biophysical properties; Directional characteristic; Intraspecific variation; Laboratory measurements; Optical remote sensing data; Scattering mechanisms; Simultaneous measurement; Transmittance spectra; Forestry; Picea abies; Pinus sylvestris; Quercus petraea
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/178966
作者单位	Department of Built Environment, Aalto University, P.O. Box 14100, Aalto, 00076, Finland; Department of Geography, Remote Sensing Laboratories, University of Zürich, Winterthurerstrasse 190, Zurich, 8057, Switzerland; Department of Electronics and Nanoengineering, Aalto University, P.O. Box 15500, Aalto, 00076, Finland
推荐引用方式 GB/T 7714	Forsström P.R.,Hovi A.,Ghielmetti G.,et al. Multi-angular reflectance spectra of small single trees[J],2021,255.
APA	Forsström P.R.,Hovi A.,Ghielmetti G.,Schaepman M.E.,&Rautiainen M..(2021).Multi-angular reflectance spectra of small single trees.Remote Sensing of Environment,255.
MLA	Forsström P.R.,et al."Multi-angular reflectance spectra of small single trees".Remote Sensing of Environment 255(2021).