Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 431115
Title A note on upscaling coniferous needle spectra to shoot spectral albedo
Author(s) Rautiainen, M.; Mottus, M.; Yanez Rausell, L.; Homolova, L.; Malenovsky, Z.; Schaepman, M.E.
Source Remote Sensing of Environment 117 (2012). - ISSN 0034-4257 - p. 469 - 474.
DOI https://doi.org/10.1016/j.rse.2011.10.019
Department(s) Laboratory of Geo-information Science and Remote Sensing
PE&RC
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) leaf-area index - scots pine - optical-properties - silhouette area - radiation - canopies - light - stands - model - simulations
Abstract Mutual shading of needles in coniferous shoots 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 needle spectral albedo up to shoot spectral albedo 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 shoot spectral albedo 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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