Leaf BRDF measurements and model for specular and diffuse components differentiation
Leaf BRDF measurements and model for specular and diffuse components differentiation
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DOI：
10.1016/j.rse.2005.07.005
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发表时间：
2005-10-15
影响因子：
13.5
通讯作者：
Moya, I
中科院分区：
文献类型：
--
作者：
Bousquet, L;Lachérade, S;Moya, I
本文旨在通过区分镜面反射和漫反射成分来关联叶片双向反射分布函数（BRDF）的光谱和方向变化。为此，对月桂（Prunus laurocerasus）、欧洲山毛榉（Fagus silvatica）和榛树（Corylus avellana）叶片的BRDF在可见光（VIS）和近红外（NIR）波段（480 - 880 nm）均匀分布的400个波长以及400种光源 - 叶片 - 传感器配置下进行了测量。测量分析表明镜面反射成分具有光谱不变性，其方向形状主要由叶片表面粗糙度决定。在每个波长的BRDF上拟合了一个基于物理的三参数模型，证实了可见光波段镜面反射成分的光谱不变性，随后在近红外波段略有变差。由于该成分，在叶绿素吸收波长处，未穿透叶片的反射光量可能相当可观。最后，通过引入PROSPECT模型，我们提出了一个五参数模型来模拟可见光 - 近红外波段的叶片光谱和双向反射率。（C）2005 Elsevier Inc.保留所有权利。
This paper aims to link the spectral and directional variations of the leaf Bidirectional Reflectance Distribution Function (BRDF) by differentiating specular and diffuse components. To do this, BRDF of laurel (Prunus laurocesarus), European beech (Fagus silvatica) and hazel (Corylus avellana) leaves were measured at 400 'wavelengths evenly spaced over the visible (VIS) and near-infrared (NIR) domains (480-880 nm) and at 400 source-leaf-sensor configurations. Measurement analysis suggested a spectral invariance of the specular component, the directional shape of which was mainly driven by leaf surface roughness. A three-parameter physically based model was fitted on the BRDF at each wavelength, confirming the spectral invariance of the specular component in the VIS, followed by a slight deterioration in the NIR. Due to this component, the amount of reflected light which did not penetrate into the leaf, could be considered as significant at wavelengths of chlorophyll absorption. Finally, by introducing the PROSPECT model, we proposed a five-parameter model to simulate leaf spectral and bidirectional reflectance in the VIS-NIR. (C) 2005 Elsevier Inc. All rights reserved.