Analyses of Impact of Needle Surface Properties on Estimation of Needle Absorption Spectrum: Case Study with Coniferous Needle and Shoot Samples.
Analyses of Impact of Needle Surface Properties on Estimation of Needle Absorption Spectrum: Case Study with Coniferous Needle and Shoot Samples.
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针表面特性对针吸收光谱估计的影响分析：针叶树针和芽样品的案例研究
DOI：
10.3390/rs8070563
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发表时间：
2016-07
期刊：
影响因子：
5
通讯作者：
Yan L
中科院分区：
文献类型：
--
作者：
Yang B;Knyazikhin Y;Lin Y;Yan K;Chen C;Park T;Choi S;Mõttus M;Rautiainen M;Myneni RB;Yan L
叶片散射光谱是从遥感中传递叶片吸收成分信息的关键光学变量。由于叶片散射的辐射受三维冠层结构的影响，它无法从太空直接测量。此外，一些辐射在叶片表面发生镜面反射。这部分反射辐射是部分偏振的，不与叶片内部的色素相互作用，因此不包含其内部的信息。关于叶片表面的光谱和角度散射特性的经验数据非常少。虽然冠层结构的影响已被充分了解，但叶片表面反射对叶片吸收光谱估计的影响仍然不确定。本文对红松和红皮云杉的针叶和枝条反射光的角度、光谱和偏振测量进行了实证和理论分析。我们的结果表明，忽略叶片表面反射辐射会导致叶片吸收光谱的估计不准确。偏振测量可能有助于解释叶片表面的影响，因为从叶片表面反射的辐射是部分偏振的，而从叶片内部反射的辐射则不是。
Leaf scattering spectrum is the key optical variable that conveys information about leaf absorbing constituents from remote sensing. It cannot be directly measured from space because the radiation scattered from leaves is affected by the 3D canopy structure. In addition, some radiation is specularly reflected at the surface of leaves. This portion of reflected radiation is partly polarized, does not interact with pigments inside the leaf and therefore contains no information about its interior. Very little empirical data are available on the spectral and angular scattering properties of leaf surfaces. Whereas canopy-structure effects are well understood, the impact of the leaf surface reflectance on estimation of leaf absorption spectra remains uncertain. This paper presents empirical and theoretical analyses of angular, spectral, and polarimetric measurements of light reflected by needles and shoots of Pinus koraiensis and Picea koraiensis species. Our results suggest that ignoring the leaf surface reflected radiation can result in an inaccurate estimation of the leaf absorption spectrum. Polarization measurements may be useful to account for leaf surface effects because radiation reflected from the leaf surface is partly polarized, whereas that from the leaf interior is not.
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DOI：
10.1073/pnas.1210196109
发表时间：
2013-01-15
影响因子：
11.1
作者：
Knyazikhin, Yuri;Schull, Mitchell A.;Myneni, Ranga B.
通讯作者：
Myneni, Ranga B.
影响因子：
13.5
作者：
Milton, Edward J.;Schaepman, Michael E.;Fox, Nigel
通讯作者：
Fox, Nigel
影响因子：
13.5
作者：
Rautiainen, Miina;Mottus, Matti;Schaepman, Michael E.
通讯作者：
Schaepman, Michael E.
影响因子：
7.4
作者：
SAVITZKY, A;GOLAY, MJE
通讯作者：
GOLAY, MJE
影响因子：
13.5
作者：
Bousquet, L;Lachérade, S;Moya, I
通讯作者：
Moya, I