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A note on upscaling coniferous needle spectra to shoot spectral albedo


Rautiainen, M; Mõttus, M; Yáñez-Rausell, L; Homolová, L; Malenovský, Z; Schaepman, M E (2012). A note on upscaling coniferous needle spectra to shoot spectral albedo. Remote Sensing of Environment, 117:469-474.

Abstract

Mutual shading of needles in coniferousshoots and small-scale variations in needle area density both within and between shoots violate conventional assumptions used in the definition of the elementary volume in radiative transfer models. In this paper, we test the hypothesis if it is possible to scale needlespectralalbedo up to shootspectralalbedo using only one structural parameter: the spherically averaged shoot silhouette to total area ratio (STAR). To test the hypothesis, we measured both structural and spectral properties of ten Scots pine (Pinus sylvestris) shoots and their needles. Our results indicate that it is possible to upscale from needle to shootspectralalbedo using STAR. The upscaling model performed best in the VIS and SWIR regions, and for shoots with high STAR values. As STAR is linearly related to photon recollision probability, it is also possible to apply the upscaling model as integral part of radiative transfer models.

Mutual shading of needles in coniferousshoots and small-scale variations in needle area density both within and between shoots violate conventional assumptions used in the definition of the elementary volume in radiative transfer models. In this paper, we test the hypothesis if it is possible to scale needlespectralalbedo up to shootspectralalbedo using only one structural parameter: the spherically averaged shoot silhouette to total area ratio (STAR). To test the hypothesis, we measured both structural and spectral properties of ten Scots pine (Pinus sylvestris) shoots and their needles. Our results indicate that it is possible to upscale from needle to shootspectralalbedo using STAR. The upscaling model performed best in the VIS and SWIR regions, and for shoots with high STAR values. As STAR is linearly related to photon recollision probability, it is also possible to apply the upscaling model as integral part of radiative transfer models.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Geography
Dewey Decimal Classification:910 Geography & travel
Language:English
Date:2012
Deposited On:04 Jul 2012 08:40
Last Modified:05 Apr 2016 15:51
Publisher:Elsevier
ISSN:0034-4257
Publisher DOI:10.1016/j.rse.2011.10.019
Permanent URL: http://doi.org/10.5167/uzh-62982

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