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

文献类型：期刊论文

作者Wu, Yi1; Zhang, Junqiang2; Zhao, Haimeng3; Xie, Donghui4; Knyazikhin, Yuri5; Yang, Bin6
刊名REMOTE SENSING
出版日期2018-10-01
卷号10期号:10页码:17
关键词leaf specular reflection radiative regime stochastic radiative transfer model (SRTM) polarization measurements
ISSN号2072-4292
DOI10.3390/rs10101632
通讯作者Yang, Bin(binyang@hnu.edu.cn) ; Zhao, Haimeng(zhaohaimeng@163.com)
英文摘要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.
WOS关键词BIDIRECTIONAL REFLECTANCE ; AREA INDEX ; VEGETATION CANOPIES ; SAIL MODEL
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]
WOS研究方向Remote Sensing
语种英语
WOS记录号WOS:000448555800132
出版者MDPI
资助机构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
源URL[http://ir.ciomp.ac.cn/handle/181722/60550]  
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Zhao, Haimeng; Yang, Bin
作者单位1.Guangxi Zhuang Autonomous Region Environm Monitor, Nanning 530028, Peoples R China
2.Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, Changchun 130033, Jilin, Peoples R China
3.Guilin Univ Aerosp Technol, Guangxi Coll & Univ Key Lab Unmanned Aerial Vehic, Guilin 541004, Peoples R China
4.Beijing Normal Univ, Sch Geog, State Key Lab Remote Sensing Sci, Beijing 100875, Peoples R China
5.Boston Univ, Dept Earth & Environm, 685 Commonwealth Ave, Boston, MA 02215 USA
6.Hunan Univ, Coll Elect & Informat Engn, Changsha 410082, Hunan, Peoples R China
推荐引用方式
GB/T 7714		 Wu, Yi,Zhang, Junqiang,Zhao, Haimeng,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 Wu, Yi,Zhang, Junqiang,Zhao, Haimeng,Xie, Donghui,Knyazikhin, Yuri,&Yang, Bin.(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 Wu, Yi,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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来源：长春光学精密机械与物理研究所

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