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Crop geometry identification based on inversion of semiempirical BRDF models

文献类型： 外文期刊

作者： Huang Wen-jiang 1 ; Wang Jin-di 2 ; Mu Xi-han 2 ; Wang Ji-hua 2 ; Liu Liang-yun 2 ; Liu Qiang 2 ; Niu Zheng 2 ;

作者机构： 1.Natl Engn Res Ctr Informat Technol Agr, Beijing 100097, Peoples R China

2.Natl Engn Res Ctr Informat Technol Agr, Beijing 100097, Peoples R China; Beijing Normal Univ, Res Ctr Remote Sensing, Beijing 100875, Peoples R China; Beijing Normal Univ, Sch Geog, GIS, Beijing 100875, Peoples R China; Chinese Acad Sci, Inst Remote Sensing Applicat, State Key Lab Remote Sensing Sci, Beijing 100101, Peoples R China

关键词： winter wheat; crop geometry; bidirectional reflectance distribution function (BRDF); Structure parameter sensitive index (SPEI)

期刊名称：SPECTROSCOPY AND SPECTRAL ANALYSIS （ 影响因子：0.589； 五年影响因子：0.504 ）

ISSN： 1000-0593

年卷期： 2007 年 27 卷 10 期

页码：

收录情况： SCI

摘要： Investigations have been made on identification of erective and horizontal varieties by bidirectional canopy reflected spectrum and semi-empirical bidirectional reflectance distribution function(BRDF) models. The qualitative effect of leaf area index (LAI) and average leaf angle (ALA) on crop canopy reflected spectrum was studied. The structure parameter sensitive index (SPEI) based on the weight for the volumetric kernel (f(vol))the weight for the geometric kernel (f(geo)), and the weight for constant corresponding to isotropic reflectance (f(iso)), was defined in the present study for crop geometry identification. However, the weights associated with the kernels of semi-empirical BRDF model do not have a direct relationship with measurable biophysical parameters. Therefore, efforts have focused on trying to find the relation between these semi-empirical BRDF kernel weights and various vegetation structures. SPEI was proved to be more sensitive to identify crop geometry structures than structural scattering index (SSI) and normalized difference f-index (NDFI), SPEI could be used to distinguish erective and horizontal geometry varieties. So, it is feasible to identify horizontal and erective varieties of wheat by bidirectional canopy reflected spectrum.

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