Analyses of Impact of Needle Surface Properties on Estimation of Needle Absorption Spectrum: Case Study with Coniferous Needle and Shoot Samples
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...
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| Format: | Article |
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MDPI AG
2016-07-01
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| Series: | Remote Sensing |
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| Online Access: | http://www.mdpi.com/2072-4292/8/7/563 |
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| author | Bin Yang Yuri Knyazikhin Yi Lin Kai Yan Chi Chen Taejin Park Sungho Choi Matti Mõttus Miina Rautiainen Ranga B. Myneni Lei Yan |
| author_facet | Bin Yang Yuri Knyazikhin Yi Lin Kai Yan Chi Chen Taejin Park Sungho Choi Matti Mõttus Miina Rautiainen Ranga B. Myneni Lei Yan |
| author_sort | Bin Yang |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-20T06:53:39Z |
| format | Article |
| id | doaj.art-8d298b857c934881bad7f40b16dd696b |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-12-20T06:53:39Z |
| publishDate | 2016-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-8d298b857c934881bad7f40b16dd696b2022-12-21T19:49:27ZengMDPI AGRemote Sensing2072-42922016-07-018756310.3390/rs8070563rs8070563Analyses of Impact of Needle Surface Properties on Estimation of Needle Absorption Spectrum: Case Study with Coniferous Needle and Shoot SamplesBin Yang0Yuri Knyazikhin1Yi Lin2Kai Yan3Chi Chen4Taejin Park5Sungho Choi6Matti Mõttus7Miina Rautiainen8Ranga B. Myneni9Lei Yan10Beijing Key Laboratory of Spatial Information Integration and 3S Application, Institute of RS and GIS, School of Earth and Space Sciences, Peking University, Beijing 100871, ChinaDepartment of Earth and Environment, Boston University, Boston, MA 02215, USABeijing Key Laboratory of Spatial Information Integration and 3S Application, Institute of RS and GIS, School of Earth and Space Sciences, Peking University, Beijing 100871, ChinaDepartment of Earth and Environment, Boston University, Boston, MA 02215, USADepartment of Earth and Environment, Boston University, Boston, MA 02215, USADepartment of Earth and Environment, Boston University, Boston, MA 02215, USADepartment of Earth and Environment, Boston University, Boston, MA 02215, USADepartment of Geosciences and Geography, University of Helsinki, P.O. Box 68, Helsinki, FI 00014, FinlandSchools of Engineering and Electrical Engineering, Aalto University, P.O. Box 15800, Aalto 00076, FinlandDepartment of Earth and Environment, Boston University, Boston, MA 02215, USABeijing Key Laboratory of Spatial Information Integration and 3S Application, Institute of RS and GIS, School of Earth and Space Sciences, Peking University, Beijing 100871, ChinaLeaf 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.http://www.mdpi.com/2072-4292/8/7/563leaf albedoleaf biochemistryleaf surface reflectancepolarization measurements |
| spellingShingle | Bin Yang Yuri Knyazikhin Yi Lin Kai Yan Chi Chen Taejin Park Sungho Choi Matti Mõttus Miina Rautiainen Ranga B. Myneni Lei Yan Analyses of Impact of Needle Surface Properties on Estimation of Needle Absorption Spectrum: Case Study with Coniferous Needle and Shoot Samples Remote Sensing leaf albedo leaf biochemistry leaf surface reflectance polarization measurements |
| title | Analyses of Impact of Needle Surface Properties on Estimation of Needle Absorption Spectrum: Case Study with Coniferous Needle and Shoot Samples |
| title_full | Analyses of Impact of Needle Surface Properties on Estimation of Needle Absorption Spectrum: Case Study with Coniferous Needle and Shoot Samples |
| title_fullStr | Analyses of Impact of Needle Surface Properties on Estimation of Needle Absorption Spectrum: Case Study with Coniferous Needle and Shoot Samples |
| title_full_unstemmed | Analyses of Impact of Needle Surface Properties on Estimation of Needle Absorption Spectrum: Case Study with Coniferous Needle and Shoot Samples |
| title_short | Analyses of Impact of Needle Surface Properties on Estimation of Needle Absorption Spectrum: Case Study with Coniferous Needle and Shoot Samples |
| title_sort | analyses of impact of needle surface properties on estimation of needle absorption spectrum case study with coniferous needle and shoot samples |
| topic | leaf albedo leaf biochemistry leaf surface reflectance polarization measurements |
| url | http://www.mdpi.com/2072-4292/8/7/563 |
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