Influence of Leaf Specular Reflection on Canopy Radiative Regime Using an Improved Version of the Stochastic Radiative Transfer Model

doi:10.3390/rs10101632

CIOMP OpenIR

	Influence of Leaf Specular Reflection on Canopy Radiative Regime Using an Improved Version of the Stochastic Radiative Transfer Model
	Yang, Bin 1; Knyazikhin, Yuri 2; Xie, Donghui 3; Zhao, Haimeng 4; Zhang, Junqiang5 ; Wu, Yi 6
	2018-10-01
发表期刊	REMOTE SENSING
ISSN	2072-4292
卷号	10 期号:10 页码:17
通讯作者	Yang, Bin(binyang@hnu.edu.cn) ; Zhao, Haimeng(zhaohaimeng@163.com)
摘要	Interpreting remotely-sensed data requires realistic, but simple, models of radiative transfer that occurs within a vegetation canopy. In this paper, an improved version of the stochastic radiative transfer model (SRTM) is proposed by assuming that all photons that have not been specularly reflected enter the leaf interior. The contribution of leaf specular reflection is considered by modifying leaf scattering phase function using Fresnel reflectance. The canopy bidirectional reflectance factor (BRF) estimated from this model is evaluated through comparisons with field-measured maize BRF. The result shows that accounting for leaf specular reflection can provide better performance than that when leaf specular reflection is neglected over a wide range of view zenith angles. The improved version of the SRTM is further adopted to investigate the influence of leaf specular reflection on the canopy radiative regime, with emphases on vertical profiles of mean radiation flux density, canopy absorptance, BRF, and normalized difference vegetation index (NDVI). It is demonstrated that accounting for leaf specular reflection can increase leaf albedo, which consequently increases canopy mean upward/downward mean radiation flux density and canopy nadir BRF and decreases canopy absorptance and canopy nadir NDVI when leaf angles are spherically distributed. The influence is greater for downward/upward radiation flux densities and canopy nadir BRF than that for canopy absorptance and NDVI. The results provide knowledge of leaf specular reflection and canopy radiative regime, and are helpful for forward reflectance simulations and backward inversions. Moreover, polarization measurements are suggested for studies of leaf specular reflection, as leaf specular reflection is closely related to the canopy polarization.
关键词	leaf specular reflection radiative regime stochastic radiative transfer model (SRTM) polarization measurements
DOI	10.3390/rs10101632
关键词[WOS]	BIDIRECTIONAL REFLECTANCE ; AREA INDEX ; VEGETATION CANOPIES ; SAIL MODEL
收录类别	SCI
语种	英语
资助项目	Fundamental Research Funds for the Central Universities[531107051063] ; Rainbow Plan of Yusense Information Technology and Equipment (Qingdao) Ltd.[YCCH20080101] ; National Key Research and Development Program of China[2017YFB0503004-4] ; National Natural Science Foundation of China[41701391]
项目资助者	Fundamental Research Funds for the Central Universities ; Rainbow Plan of Yusense Information Technology and Equipment (Qingdao) Ltd. ; National Key Research and Development Program of China ; National Natural Science Foundation of China
WOS研究方向	Remote Sensing
WOS类目	Remote Sensing
WOS记录号	WOS:000448555800132
出版者	MDPI
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/60549
专题	中国科学院长春光学精密机械与物理研究所
通讯作者	Yang, Bin; Zhao, Haimeng
作者单位	1.Hunan Univ, Coll Elect & Informat Engn, Changsha 410082, Hunan, Peoples R China 2.Boston Univ, Dept Earth & Environm, 685 Commonwealth Ave, Boston, MA 02215 USA 3.Beijing Normal Univ, Sch Geog, State Key Lab Remote Sensing Sci, Beijing 100875, Peoples R China 4.Guilin Univ Aerosp Technol, Guangxi Coll & Univ Key Lab Unmanned Aerial Vehic, Guilin 541004, Peoples R China 5.Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, Changchun 130033, Jilin, Peoples R China 6.Guangxi Zhuang Autonomous Region Environm Monitor, Nanning 530028, Peoples R China
推荐引用方式 GB/T 7714	Yang, Bin,Knyazikhin, Yuri,Xie, Donghui,et al. Influence of Leaf Specular Reflection on Canopy Radiative Regime Using an Improved Version of the Stochastic Radiative Transfer Model[J]. REMOTE SENSING,2018,10(10):17.
APA	Yang, Bin,Knyazikhin, Yuri,Xie, Donghui,Zhao, Haimeng,Zhang, Junqiang,&Wu, Yi.(2018).Influence of Leaf Specular Reflection on Canopy Radiative Regime Using an Improved Version of the Stochastic Radiative Transfer Model.REMOTE SENSING,10(10),17.
MLA	Yang, Bin,et al."Influence of Leaf Specular Reflection on Canopy Radiative Regime Using an Improved Version of the Stochastic Radiative Transfer Model".REMOTE SENSING 10.10(2018):17.

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