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Influence of Leaf Specular Reflection on Canopy Radiative Regime Using an Improved Version of the Stochastic Radiative Transfer Model
Yang, Bin1; Knyazikhin, Yuri2; Xie, Donghui3; Zhao, Haimeng4; Zhang, Junqiang5; Wu, Yi6
2018-10-01
Source PublicationREMOTE SENSING
ISSN2072-4292
Volume10Issue:10Pages:17
Corresponding AuthorYang, Bin(binyang@hnu.edu.cn) ; Zhao, Haimeng(zhaohaimeng@163.com)
AbstractInterpreting 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.
Keywordleaf specular reflection radiative regime stochastic radiative transfer model (SRTM) polarization measurements
DOI10.3390/rs10101632
WOS KeywordBIDIRECTIONAL REFLECTANCE ; AREA INDEX ; VEGETATION CANOPIES ; SAIL MODEL
Indexed BySCI
Language英语
Funding ProjectFundamental 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]
Funding OrganizationFundamental 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 Research AreaRemote Sensing
WOS SubjectRemote Sensing
WOS IDWOS:000448555800132
PublisherMDPI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ciomp.ac.cn/handle/181722/60550
Collection中国科学院长春光学精密机械与物理研究所
Corresponding AuthorYang, Bin; Zhao, Haimeng
Affiliation1.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
Recommended Citation
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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