A spectral directional reflectance model of row crops

A spectral directional reflectance model of row crops
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行间作物的光谱定向反射率模型

DOI:
10.1016/j.rse.2009.09.018
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发表时间:
2010-02
影响因子:
13.5
通讯作者:
Liangfu Chen
Liangfu Chen
中科院分区:
工程技术1区
文献类型:
--
作者:
Feng Zhao;Huijie Zhao;Xinfa Gu;Wout Verhoef;Qiao Wang;Tao Yu;Qiang Liu;Huaguo Huang;Wenhan Qin;Liangfu Chen

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本文通过分离直接辐射和散射辐射的贡献,建立了一个高效的行间植被反射率模型。行模型允许计算光谱区域在任何给定方向上的反射光谱。通过与冬小麦田间实测资料以及已建立的三维计算机模拟模型的比较,对模型的性能进行了评价。特别是与计算机模拟模型的系统比较表明,该模型除了能模拟热点效应外,还能较好地模拟植被冠层定向反射系数的特征分布,即在反射率极坐标图上表现为近似平行于行向的高值或低值条带。提出了引起动力学的物理机制,并通过比较研究得到支持。行冠层反射率的分布特征与均匀冠层反射率的分布特征明显不同,这意味着利用一维辐射传输模型来解释辐射数据并根据反射率测量值估计行冠层的结构或光谱参数是有问题的。最后,对当前模型需要进一步改进的地方进行了简要讨论。
A computationally efficient reflectance model for row planted canopies is developed in this paper through separating the contributions of incident direct and diffuse radiation scattered by row canopies. The row model allows calculating the reflectance spectrum in any given direction for the optical spectral region. The performance of the model is evaluated through comparisons with field measurements of winter wheat as well as with an established 3D computer simulation model. Especially the systematic comparisons with the computer simulation model demonstrate that the model can adequately simulate the characteristic distribution of directional reflectance factors of row canopies, which is shown in the polar map of reflectance as a high or low value stripe approximately parallel to the row orientation, besides the hotspot effect. Physical mechanisms causing the dynamics were proposed and supported by comparison studies. The features of reflectance distributions of row canopies, which are distinctively different from those of homogeneous canopy, imply that it is problematic to use one-dimensional radiation transfer model to interpret radiation data and estimate the structural or spectral parameters of row canopies from reflectance measurements. Finally, further improvements needed for the current model are briefly discussed.
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