2014
DOI: 10.1109/jstars.2013.2272890
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Minimizing Measurement Uncertainties of Coniferous Needle-Leaf Optical Properties, Part I: Methodological Review

Abstract: Optical properties (OPs) of non-flat narrow plant leaves, i.e., coniferous needles, are extensively used by the remote sensing community, in particular for calibration and validation of radiative transfer models at leaf and canopy level. Optical measurements of such small living elements are, however, a technical challenge and only few studies attempted so far to investigate and quantify related measurement errors. In this paper we review current methods and developments measuring optical properties of narrow … Show more

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Cited by 48 publications
(17 citation statements)
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“…Measuring both reflectance and transmittance of individual needles is possible with sample holders (often called "needle carriers") that hold the needles in the sample port of an integrating sphere. The drawback of the method, in general, is that it requires accurate determination of the area of gaps between the needles in the sample holder [9,10]. The measurement method and processing parameters used e.g., in determining gap fractions between needles can have a large influence on the measured needle spectra, which complicates comparison of results (e.g., concerning interspecific variation in needle spectra) from different studies.…”
Section: Measurements Of Needle Optical Propertiesmentioning
confidence: 99%
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“…Measuring both reflectance and transmittance of individual needles is possible with sample holders (often called "needle carriers") that hold the needles in the sample port of an integrating sphere. The drawback of the method, in general, is that it requires accurate determination of the area of gaps between the needles in the sample holder [9,10]. The measurement method and processing parameters used e.g., in determining gap fractions between needles can have a large influence on the measured needle spectra, which complicates comparison of results (e.g., concerning interspecific variation in needle spectra) from different studies.…”
Section: Measurements Of Needle Optical Propertiesmentioning
confidence: 99%
“…Other genera (Calocedrus, Chmaecyparis, Cryptomeria, Cunninghamia) had only a single occurrence. Of single species, the most common were Pinus sylvestris (14), Picea abies (12), Pinus banksiana (10), and Picea mariana (9). Other species had a maximum of 5 occurrences per species.…”
Section: Interspecific Variation In Needle Spectramentioning
confidence: 99%
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