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Characterization, validation and intercomparison of Clumping Index maps from POLDER, MODIS, MISR satellite data over reference sites

hal.structure.identifierTartu Observatory
dc.contributor.authorPISEK, Jan
hal.structure.identifierUniversity of Toronto
dc.contributor.authorHE, Liming
hal.structure.identifierUniversity of Toronto
dc.contributor.authorCHEN, Jing Ming
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorGOVIND, Ajit
hal.structure.identifierJewish National Fund-Keren Kayemet LeIsrael
dc.contributor.authorSPRINTSIN, Michael
hal.structure.identifierSeoul National University [Seoul] [SNU]
dc.contributor.authorRYU, Youngryel
hal.structure.identifierUniversity of Melbourne
dc.contributor.authorARNDT, Stefan
hal.structure.identifierUniversity of Melbourne
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
hal.structure.identifierNational Research Council of Italy | Consiglio Nazionale delle Ricerche [CNR]
dc.contributor.authorMATTEUCCI, Georgio
hal.structure.identifierEcologie et Ecophysiologie Forestières [devient SILVA en 2018] [EEF]
dc.contributor.authorLONGDOZ, Bernard
hal.structure.identifierTartu Observatory
dc.contributor.authorRAABE, Kairi
dc.date.accessioned2024-04-08T11:55:17Z
dc.date.available2024-04-08T11:55:17Z
dc.date.issued2015
dc.date.conference2015-12-14
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/195658
dc.description.abstractEnVegetation foliage clumping significantly alters its radiation environment and therefore affects vegetation growth as well as water and carbon cycles. The clumping index is useful in ecological and meteorological models because it provides new structural information in addition to the effective leaf area index (LAI) retrieved from mono-angle remote sensing and allows accurate separation of sunlit and shaded leaves in the canopy. Not accounting for the foliage clumping in LAI retrieval algorithms leads to substantial underestimation of actual LAI, especially for needleleaf forests. 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, from Moderate Resolution Imaging Spectroradiometer (MODIS) Bidirectional Reflectance Distribution Function (BRDF) product at 500 m resolution. 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 products 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 resolution in particular can provide good quality clumping index estimates at pertinent scales for modeling local carbon and energy fluxes.
dc.language.isoen
dc.title.enCharacterization, validation and intercomparison of Clumping Index maps from POLDER, MODIS, MISR satellite data over reference sites
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.titleAGU Fall Meeting 2015
bordeaux.countryUS
bordeaux.conference.citySan Francisco
bordeaux.peerReviewedoui
hal.identifierhal-02797995
hal.version1
hal.invitednon
hal.conference.end2015-12-18
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02797995v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.date=2015&rft.spage=n.p.&rft.epage=n.p.&rft.au=PISEK,%20Jan&HE,%20Liming&CHEN,%20Jing%20Ming&GOVIND,%20Ajit&SPRINTSIN,%20Michael&rft.genre=conference


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