An analytical hybrid GORT model for bidirectional reflectance over discontinuous plant canopies

被引:93
作者
Ni, WG [1 ]
Li, XW
Woodcock, CE
Caetano, MR
Strahler, AH
机构
[1] Boston Univ, Dept Geog, Boston, MA 02215 USA
[2] Raytheon STX, Lanham, MD 20706 USA
[3] Chinese Acad Sci, Inst Remote Sensing Applicat, Beijing 100101, Peoples R China
[4] CNIG, Natl Ctr Geog Informat, Lisbon, Portugal
[5] Boston Univ, Ctr Remote Sensing, Boston, MA 02215 USA
来源
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING | 1999年 / 37卷 / 02期
基金
美国国家航空航天局;
关键词
analytical GORT-BRDF model; discontinuous plant canopies;
D O I
10.1109/36.752217
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The geometric optical (GO) bidirectional reflectance model, combined with a new component spectral signature submodel, can be used to estimate the bidirectional reflectance distribution function (BRDF) of discontinuous canopies. This approach retains the GO approach of incorporating the effect of shadows cast bq clowns on the background. The newly developed submodel uses an analytical approximation of the radiative transfer (RT) within the plant canopies to model the spectral properties of each scene component. A multiple scale-hotspot function that incorporates effects for smaller canopy objects like branches, stems and lea,les was also well modeled. Comparison of model results with field measurements (ASAS, POLDER and PARABOLA) over an old black spruce forest in central Canada demonstrated that the model can predict the basic features of the BRDF, i.e., bowl shape and the hotspot, The benefits of the model presented are simplicity, improved treatment of multiple scattering and a new; method of estimating the component signatures.
引用
收藏
页码:987 / 999
页数:13
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