气候变化领域集成服务门户(CCPortal): Practical approaches for normalizing directional solar-induced fluorescence to a standard viewing geometry

CCPortal

DOI	10.1016/j.rse.2020.112171
	Practical approaches for normalizing directional solar-induced fluorescence to a standard viewing geometry
	Hao D.; Zeng Y.; Qiu H.; Biriukova K.; Celesti M.; Migliavacca M.; Rossini M.; Asrar G.R.; Chen M.
发表日期	2021
ISSN	00344257
卷号	255
英文摘要	Recent advances in remote sensing of solar-induced chlorophyll fluorescence (SIF) have improved the capabilities of monitoring large-scale Gross Primary Productivity (GPP). However, SIF observations are subject to directional effects which can lead to considerable uncertainties in various applications. Practical approaches for normalizing directional SIF observations to nadir viewing, to minimize the directional effects, have not been well studied. Here we developed two practical and physically-solid approaches for removing the directional effects of anisotropic SIF observations: one is based on near-infrared or red reflectance of vegetation (NIRv and Redv), and the other is based on the kernel-driven model with multi-angular SIF measurements. The first approach uses surface reflectance while the second approach directly leverages multi-angular SIF measurements. The performance of the two approaches was evaluated using a dataset of multi-angular measurements of SIF and reflectance collected with a high-resolution field spectrometer over different plant canopies. Results show that the relative mean absolute errors between the normalized nadir SIF and the observed SIF at nadir decrease by 3–6% (far-red) and 6–8% (red) for the first approach, and by 7–13% and 6–11% for the second approach, compared to the original data, respectively. The effectiveness and simplicity of our proposed approaches provide great potential to generate long-term and consistent SIF data records with minimized directional effects. © 2020 Elsevier Inc.
英文关键词	Angular normalization; Directional effects; Kernel-driven model; Near-infrared reflectance of vegetation; Red reflectance of vegetation; Solar-induced chlorophyll fluorescence
语种	英语
scopus关键词	Angle measurement; Fluorescence; Infrared devices; Plants (botany); Reflection; Chlorophyll fluorescence; Directional effects; Gross primary productivity; High resolution; Mean absolute error; Plant canopies; Solar-induced fluorescences; Surface reflectance; Remote sensing; fluorescence; geometry; nadir; net primary production; remote sensing; satellite data; surface reflectance
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/178974
作者单位	Joint Global Change Research Institute, Pacific Northwest National Laboratory, College Park, MD, United States; Remote Sensing of Environmental Dynamics Laboratory, Department of Earth and Environmental Sciences (DISAT), University of Milano-Bicocca, Piazza della Scienza 1, Milano, Italy; Max Planck Institute for Biogeochemistry, Hans Knoll Str. 10, Jena, 07743, Germany; Universities Space Research Association, Columbia, MD, United States
推荐引用方式 GB/T 7714	Hao D.,Zeng Y.,Qiu H.,et al. Practical approaches for normalizing directional solar-induced fluorescence to a standard viewing geometry[J],2021,255.
APA	Hao D..,Zeng Y..,Qiu H..,Biriukova K..,Celesti M..,...&Chen M..(2021).Practical approaches for normalizing directional solar-induced fluorescence to a standard viewing geometry.Remote Sensing of Environment,255.
MLA	Hao D.,et al."Practical approaches for normalizing directional solar-induced fluorescence to a standard viewing geometry".Remote Sensing of Environment 255(2021).