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Characterization, validation and intercomparison of clumping index maps from POLDER, MODIS, and MISR data

hal.structure.identifierTartu Observatory
hal.structure.identifierWater Insight
dc.contributor.authorPISEK, Jan
hal.structure.identifierUniversity of Toronto
dc.contributor.authorHE, Liming
hal.structure.identifierUniversity of Toronto
dc.contributor.authorCHEN, Jing M.
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorGOVIND, Ajit
hal.structure.identifierJewish National Fund-Keren Kayemet LeIsrael
dc.contributor.authorSPRINTSIN, Mickael
hal.structure.identifierSeoul National University [Seoul] [SNU]
dc.contributor.authorRYU, Youngryel
hal.structure.identifierUniversity of Melbourne
dc.contributor.authorARNDT, Stephan
hal.structure.identifierMonash University
dc.contributor.authorHOCKING, Darren
hal.structure.identifierForestry Tasmania
dc.contributor.authorWARDLAW, Timothy
hal.structure.identifierTartu Observatory
dc.contributor.authorKUUSK, Joel
hal.structure.identifierSan Francisco State University [SFSU]
dc.contributor.authorOLIPHANT, Andrew J.
hal.structure.identifierUniversity of Eastern Finland
dc.contributor.authorKORHONEN, Lauri
hal.structure.identifierInstitute of Geographic Sciences and Natural Resources Research, CAS,
dc.contributor.authorFANG, Hongliang
dc.date.accessioned2024-04-08T11:55:19Z
dc.date.available2024-04-08T11:55:19Z
dc.date.issued2014
dc.date.conference2014-02-03
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/195660
dc.description.abstractEnClumping index, the measure of foliage grouping relative to a random distribution of leaves in space, is a key structural parameter of plant canopies that influences canopy radiation regimes and controls canopy photosynthesis and other land–atmosphere interactions. Normalized Difference between Hotspot and Darkspot (NDHD) index has been previously used to retrieve global clumping index maps from POLarization and Directionality of the Earth's Reflectances (POLDER) data at ~6 km resolution, the Bidirectional Reflectance Distribution Function (BRDF) product from Moderate Resolution Imaging Spectroradiometer (MODIS) at 500 m resolution, and most recently the algorithm was applied with Multi-angle Imaging SpectroRadiometer (MISR) data at 275 m resolution over selected areas. In this presentation we characterize and intercompare the three products over a set of sites representing diverse biomes and different canopy structures. The products are also directly validated with both in-situ vertical profiles and seasonal trajectories of clumping index. We illustrate that the vertical distribution of foliage and especially the effect of understory needs to be taken into account while validating foliage clumping products from remote sensing data with values measured in the field. Satellite measurements respond to the structural effects near the top of canopies, while ground measurements may be biased by the lower vegetation layers. Additionally, caution should be taken regarding the misclassification in land cover maps as their errors can be propagated into the foliage clumping maps. Our results indicate that MODIS data and MISR data with 275 m in particular can provide good quality clumping index estimates at pertinent scales for modeling local carbon and energy fluxes.
dc.language.isoen
dc.subject.enNDHD
dc.subject.enmulti-angle remote sensing
dc.subject.enPOLDER
dc.subject.enMODIS
dc.subject.enMISR
dc.subject.enclumping index
dc.subject.enhotspot
dc.title.enCharacterization, validation and intercomparison of clumping index maps from POLDER, MODIS, and MISR data
dc.typeAutre communication scientifique (congrès sans actes - poster - séminaire...)
dc.subject.halSciences du Vivant [q-bio]
dc.subject.halSciences de l'environnement
bordeaux.pagen.p.
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.conference.titleGV2M: Global Vegetation Monitoring and Modeling International Conference
bordeaux.countryFR
bordeaux.conference.cityAvignon
bordeaux.peerReviewedoui
hal.identifierhal-02797948
hal.version1
hal.invitednon
hal.conference.end2014-02-07
hal.popularnon
hal.audienceNationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02797948v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.date=2014&rft.spage=n.p.&rft.epage=n.p.&rft.au=PISEK,%20Jan&HE,%20Liming&CHEN,%20Jing%20M.&GOVIND,%20Ajit&SPRINTSIN,%20Mickael&rft.genre=conference


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