Multi-angular reflectance spectra of small single trees

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorForsström, Petri R.en_US
dc.contributor.authorHovi, Aarneen_US
dc.contributor.authorGhielmetti, Giuliaen_US
dc.contributor.authorSchaepman, Michael E.en_US
dc.contributor.authorRautiainen, Miinaen_US
dc.contributor.departmentDepartment of Built Environmenten
dc.contributor.groupauthorGeoinformaticsen
dc.contributor.organizationUniversität Zürichen_US
dc.date.accessioned2021-02-02T09:10:18Z
dc.date.available2021-02-02T09:10:18Z
dc.date.issued2021-03-15en_US
dc.description| openaire: EC/H2020/771049/EU//FREEDLES
dc.description.abstractUnderstanding the reflectance anisotropy of forests and the underlying scattering mechanisms is needed to improve the accuracy of retrievals of fundamental forest characteristics from optical remote sensing data. In this paper, we developed a laboratory measurement set-up for a large goniometer (LAGOS) and measured multi-angular spectra (350–2500 nm) of 18 small trees, composed of three common European tree species: Scots pine (Pinus sylvestris L.), Norway spruce (Picea abies (L.) H. Karst), sessile oak (Quercus petraea (Matt.) Liebl.). For all trees, we measured tree spectra in 47 view angles in the upper hemisphere. To our knowledge, this is the first study reporting multi-angular reflectance spectra of single trees. We also measured the reflectance and transmittance spectra of needles and leaves, as well as reflectance spectra of bark of the sample trees. We analyzed the spectro-directional characteristics of the trees, and the inter- and intraspecific variations of these characteristics. The anisotropy of trees was shown to be strongly asymmetrical and characteristic to species: while pine and spruce exhibited strong hotspot effects, oak showed a strong specular component. Our results indicate that simultaneous measurements of both spectral and directional characteristics of trees may enhance the discrimination of species and thus, support the retrieval of information of their biophysical properties.en
dc.description.versionPeer revieweden
dc.format.extent14
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationForsström, P R, Hovi, A, Ghielmetti, G, Schaepman, M E & Rautiainen, M 2021, ' Multi-angular reflectance spectra of small single trees ', Remote Sensing of Environment, vol. 255, 112302 . https://doi.org/10.1016/j.rse.2021.112302en
dc.identifier.doi10.1016/j.rse.2021.112302en_US
dc.identifier.issn0034-4257
dc.identifier.otherPURE UUID: 542ef84c-e234-416e-890d-30f4a9130ac4en_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/542ef84c-e234-416e-890d-30f4a9130ac4en_US
dc.identifier.otherPURE LINK: http://www.scopus.com/inward/record.url?scp=85099500444&partnerID=8YFLogxKen_US
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/55646670/1_s2.0_S0034425721000201_main.pdfen_US
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/102567
dc.identifier.urnURN:NBN:fi:aalto-202102021869
dc.language.isoenen
dc.publisherELSEVIER SCIENCE INC
dc.relationinfo:eu-repo/grantAgreement/EC/H2020/771049/EU//FREEDLESen_US
dc.relation.ispartofseriesRemote Sensing of Environmenten
dc.relation.ispartofseriesVolume 255en
dc.rightsopenAccessen
dc.subject.keywordAnisotropyen_US
dc.subject.keywordGoniometeren_US
dc.subject.keywordOaken_US
dc.subject.keywordPineen_US
dc.subject.keywordScatteringen_US
dc.subject.keywordSpruceen_US
dc.subject.keywordTree spectrumen_US
dc.titleMulti-angular reflectance spectra of small single treesen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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