Comparison of the inversion of two canopy reflectance models for mapping forest crown closure using imaging spectroscopy

被引:3
|
作者
Zeng, Yuan [1 ,2 ]
Huang, Jianxi [3 ]
Wu, Bingfang [1 ]
Schaepman, Michael E. [2 ]
de Bruin, Sytze [2 ]
Clevers, Jan G. P. W. [2 ]
机构
[1] Chinese Acad Sci, Inst Remote Sensing Applicat, Beijing 100101, Peoples R China
[2] Wageningen Univ, Ctr Geoinformat, NL-6700 AA Wageningen, Netherlands
[3] China Agr Univ, Coll Elect & Informat Engn, Beijing 100083, Peoples R China
来源
CANADIAN JOURNAL OF REMOTE SENSING | 2008年 / 34卷 / 03期
关键词
D O I
暂无
中图分类号
TP7 [遥感技术];
学科分类号
081102 ; 0816 ; 081602 ; 083002 ; 1404 ;
摘要
We compare the inversion of two canopy reflectance models to estimate forest crown closure (CC) using an EO-1 Hyperion image: the Kuusk-Nilson forest reflectance and transmittance (FRT) model, and the Li-Strahler geometric-optical model. For predicting CC on a per-pixel basis, the FRT model inversion is carried out by minimizing a merit function that provides a measure of the difference between the reflectance simulated by the FRT model and the reflectance originating from optimal band selection of Hyperion data. The inversion of the Li-Strahler model mainly depends on the relationship between the scene component "sunlit background" and forest structural parameters. We complement prediction deficiencies of the inverted Li-Strahler model CC using a spatial interpolation algorithm (regression kriging) in infeasible regions. Field-measured CCs of 40 sample sites are used to validate the inversion quality of both models. The results indicate that the Li-Strahler model inversion (R-2 = 0.67, RMSE = 0.043) performs better than the FRT model inversion (R-2 = 0.53, RMSE = 0.072) for CC retrieval. Estimated CC using the Li-Strahler model inversion combined with spatial interpolation yield a final, continuous CC map for the Longmenhe forest nature reserve in China, which is used as a study area for this work. The advantages and disadvantages of these two models inversion combined with imaging spectrometer data for mapping forest CC are discussed.
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页码:235 / 244
页数:10
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