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Assessing the consistency of optical properties measured in four integrating spheres
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SYSNO ASEP 0473867 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Assessing the consistency of optical properties measured in four integrating spheres Author(s) Lukeš, Petr (UEK-B) ORCID, SAI, RID
Homolová, Lucie (UEK-B) RID, ORCID, SAI
Navrátil, M. (CZ)
Hanuš, Jan (UEK-B) RID, SAI, ORCIDSource Title International Journal of Remote Sensing. - : Taylor & Francis - ISSN 0143-1161
Roč. 38, č. 13 (2017), s. 3817-3830Number of pages 14 s. Language eng - English Country GB - United Kingdom Keywords Artificial material ; Canopy radiative transfer ; Directional hemispherical reflectances ; Integrating spheres ; Leaf optical property ; Measurement protocol ; Standard deviation ; Statistically significant difference Subject RIV EH - Ecology, Behaviour OECD category Environmental sciences (social aspects to be 5.7) R&D Projects LO1415 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LM2015061 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Research Infrastructure CzeCOS II - 90061 - Ústav výzkumu globální změny AV ČR, v. v. i. Institutional support RVO:67179843 - RVO:67179843 UT WOS 000399247300004 EID SCOPUS 85034644913 DOI 10.1080/01431161.2017.1306144 Annotation Leaf optical properties (LOPs) determine the radiation regime of vegetation, thus being key input parameters in leaf and canopy radiative transfer models. It is of great importance to know the uncertainties originating from the LOP measurements. The most common approach to measure LOP uses integrating spheres. They allow measurements of both directional-hemispherical reflectance factor (R) and transmittance factor (T). However, sphere's design, inner surface coating and measurement protocol differ among the spheres' models and manufacturers. Our main goal was to evaluate the consistency of optical properties measured in four integrating spheres (Dualsphere, Labspehre, ASD, and Li-cor). Our test samples were three Spectralon (R) panels, four artificial materials and leaves from six common broadleaf tree species. Results showed that spectra measured in the four integrating spheres were generally similar in the spectral region between 400 and 1600 nm. The average standard deviation computed among the spectra of all samples measured in all spheres was around 0.023 (and varied between 0.005 and 0.044). Statistically significant differences were detected mainly between Dualsphere and Li-cor spheres. Workplace Global Change Research Institute Contact Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Year of Publishing 2018
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