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Remote Sens. 2016, 8(7), 563; doi:10.3390/rs8070563

Analyses of Impact of Needle Surface Properties on Estimation of Needle Absorption Spectrum: Case Study with Coniferous Needle and Shoot Samples

1
Beijing Key Laboratory of Spatial Information Integration and 3S Application, Institute of RS and GIS, School of Earth and Space Sciences, Peking University, Beijing 100871, China
2
Department of Earth and Environment, Boston University, Boston, MA 02215, USA
3
School of Geography, State Key Laboratory of Remote Sensing Science, Beijing Normal University, Beijing 100875, China
4
Department of Geosciences and Geography, University of Helsinki, P.O. Box 68, Helsinki, FI 00014, Finland
5
Schools of Engineering and Electrical Engineering, Aalto University, P.O. Box 15800, Aalto 00076, Finland
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editors: Sangram Ganguly, Compton Tucker, Clement Atzberger and Prasad S. Thenkabail
Received: 15 April 2016 / Revised: 22 June 2016 / Accepted: 29 June 2016 / Published: 2 July 2016
(This article belongs to the Special Issue Remote Sensing of Vegetation Structure and Dynamics)
View Full-Text   |   Download PDF [6373 KB, uploaded 2 July 2016]   |  

Abstract

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. View Full-Text
Keywords: leaf albedo; leaf biochemistry; leaf surface reflectance; polarization measurements leaf albedo; leaf biochemistry; leaf surface reflectance; polarization measurements
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yang, B.; Knyazikhin, Y.; Lin, Y.; Yan, K.; Chen, C.; Park, T.; Choi, S.; Mõttus, M.; Rautiainen, M.; Myneni, R.B.; Yan, L. Analyses of Impact of Needle Surface Properties on Estimation of Needle Absorption Spectrum: Case Study with Coniferous Needle and Shoot Samples. Remote Sens. 2016, 8, 563.

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