Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/21469
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dc.contributor.authorRahman, Muhammad Moshiuren
dc.contributor.authorLamb, Daviden
dc.date.accessioned2017-07-13T14:25:00Z-
dc.date.issued2017-
dc.identifier.citationInternational Journal of Remote Sensing, 38(11), p. 3219-3235en
dc.identifier.issn1366-5901en
dc.identifier.issn0143-1161en
dc.identifier.urihttps://hdl.handle.net/1959.11/21469-
dc.description.abstractRemote sensing based spectral indices, such as the normalized difference vegetation index (NDVI), are often used to estimate the fraction of absorbed photosynthetically active radiation (fAPAR) in plant canopies. Owing to similar changes in both the NDVI and fAPAR as functions of varying solar illumination angle when using entirely passive sensors, the fAPAR-NDVI relationships are often stable, appearing insensitive to solar illumination angle. Active optical sensors (AOS) on the other hand, which have their own illuminating light source and are increasingly being used to measure NDVI (NDVIAOS), do not respond to solar illumination geometry. Yet, the passive sensor-derived fAPAR component of the fAPAR-NDVIAOS relationship remains affected by solar illumination angle. In this paper, a simple two-stream canopy model has been used to predict the fAPAR-NDVIAOS relationships of a pasture canopy (tall fescue; 'Festuca arundinacea') for a nadir-viewing active optical NDVI sensor under conditions of varying solar elevation angle. Both the model derived and subsequent experimental measurements of the fAPAR-NDVIAOS relationship in this pasture confirmed a strong dependence of the linear fa Par-NDVIAOS relationships on solar illumination angle. The modelled fAPAR-NDVIAOS relationship only agreed with the field measurements when the 'solar angle-dependent directional leaf area index' (LAIθs) of the canopy, as presented to the incoming solar photons, was used as opposed to the traditionally used 'nadir version' of the leaf area index (LAI). Users of AOS to measure indices such as NDVI must account for the solar illumination angle dependent LAI0s when considering any fAPAR-NDVIAOS relationship.en
dc.languageenen
dc.publisherTaylor & Francisen
dc.relation.ispartofInternational Journal of Remote Sensingen
dc.titleThe role of directional LAI in determining the fAPAR-NDVI relationship when using active optical sensors in tall fescue ('Festuca arundinacea') pastureen
dc.typeJournal Articleen
dc.identifier.doi10.1080/01431161.2017.1292069en
dc.subject.keywordsCrop and Pasture Biomass and Bioproductsen
local.contributor.firstnameMuhammad Moshiuren
local.contributor.firstnameDaviden
local.subject.for2008070304 Crop and Pasture Biomass and Bioproductsen
local.subject.seo2008970107 Expanding Knowledge in the Agricultural and Veterinary Sciencesen
local.subject.seo2008960904 Farmland, Arable Cropland and Permanent Cropland Land Managementen
local.profile.schoolSchool of Science and Technologyen
local.profile.schoolSchool of Science and Technologyen
local.profile.emailmrahma37@une.edu.auen
local.profile.emaildlamb@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20170710-120848en
local.publisher.placeUnited Kingdomen
local.format.startpage3219en
local.format.endpage3235en
local.identifier.scopusid85015890000en
local.peerreviewedYesen
local.identifier.volume38en
local.identifier.issue11en
local.contributor.lastnameRahmanen
local.contributor.lastnameLamben
dc.identifier.staffune-id:mrahma37en
dc.identifier.staffune-id:dlamben
local.profile.orcid0000-0001-6430-0588en
local.profile.orcid0000-0002-2917-2231en
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:21660en
local.identifier.handlehttps://hdl.handle.net/1959.11/21469en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleThe role of directional LAI in determining the fAPAR-NDVI relationship when using active optical sensors in tall fescue ('Festuca arundinacea') pastureen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorRahman, Muhammad Moshiuren
local.search.authorLamb, Daviden
local.uneassociationUnknownen
local.identifier.wosid000397995400002en
local.year.published2017en
local.fileurl.closedpublishedhttps://rune.une.edu.au/web/retrieve/42cee833-9e3d-4260-bffe-dd4631e5646een
local.subject.for2020300405 Crop and pasture biomass and bioproductsen
local.subject.seo2020280101 Expanding knowledge in the agricultural, food and veterinary sciencesen
local.subject.seo2020180603 Evaluation, allocation, and impacts of land useen
local.codeupdate.date2022-02-14T08:46:41.047en
local.codeupdate.epersonrtobler@une.edu.auen
local.codeupdate.finalisedtrueen
local.original.for2020300405 Crop and pasture biomass and bioproductsen
local.original.seo2020280101 Expanding knowledge in the agricultural, food and veterinary sciencesen
local.original.seo2020180603 Evaluation, allocation, and impacts of land useen
local.original.seo2020180607 Terrestrial erosionen
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