Characterization, validation and intercomparison of clumping index maps from POLDER, MODIS, and MISR data
| hal.structure.identifier | Tartu Observatory | |
| hal.structure.identifier | Water Insight | |
| dc.contributor.author | PISEK, Jan | |
| hal.structure.identifier | University of Toronto | |
| dc.contributor.author | HE, Liming | |
| hal.structure.identifier | University of Toronto | |
| dc.contributor.author | CHEN, Jing M. | |
| hal.structure.identifier | Interactions Sol Plante Atmosphère [UMR ISPA] | |
| dc.contributor.author | GOVIND, Ajit | |
| hal.structure.identifier | Jewish National Fund-Keren Kayemet LeIsrael | |
| dc.contributor.author | SPRINTSIN, Mickael | |
| hal.structure.identifier | Seoul National University [Seoul] [SNU] | |
| dc.contributor.author | RYU, Youngryel | |
| hal.structure.identifier | University of Melbourne | |
| dc.contributor.author | ARNDT, Stephan | |
| hal.structure.identifier | Monash University | |
| dc.contributor.author | HOCKING, Darren | |
| hal.structure.identifier | Forestry Tasmania | |
| dc.contributor.author | WARDLAW, Timothy | |
| hal.structure.identifier | Tartu Observatory | |
| dc.contributor.author | KUUSK, Joel | |
| hal.structure.identifier | San Francisco State University [SFSU] | |
| dc.contributor.author | OLIPHANT, Andrew J. | |
| hal.structure.identifier | University of Eastern Finland | |
| dc.contributor.author | KORHONEN, Lauri | |
| hal.structure.identifier | Institute of Geographic Sciences and Natural Resources Research, CAS, | |
| dc.contributor.author | FANG, Hongliang | |
| dc.date.accessioned | 2024-04-08T11:55:19Z | |
| dc.date.available | 2024-04-08T11:55:19Z | |
| dc.date.issued | 2014 | |
| dc.date.conference | 2014-02-03 | |
| dc.identifier.uri | https://oskar-bordeaux.fr/handle/20.500.12278/195660 | |
| dc.description.abstractEn | Clumping 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.iso | en | |
| dc.subject.en | NDHD | |
| dc.subject.en | multi-angle remote sensing | |
| dc.subject.en | POLDER | |
| dc.subject.en | MODIS | |
| dc.subject.en | MISR | |
| dc.subject.en | clumping index | |
| dc.subject.en | hotspot | |
| dc.title.en | Characterization, validation and intercomparison of clumping index maps from POLDER, MODIS, and MISR data | |
| dc.type | Autre communication scientifique (congrès sans actes - poster - séminaire...) | |
| dc.subject.hal | Sciences du Vivant [q-bio] | |
| dc.subject.hal | Sciences de l'environnement | |
| bordeaux.page | n.p. | |
| bordeaux.hal.laboratories | Interactions Soil Plant Atmosphere (ISPA) - UMR 1391 | * |
| bordeaux.institution | Bordeaux Sciences Agro | |
| bordeaux.institution | INRAE | |
| bordeaux.conference.title | GV2M: Global Vegetation Monitoring and Modeling International Conference | |
| bordeaux.country | FR | |
| bordeaux.conference.city | Avignon | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-02797948 | |
| hal.version | 1 | |
| hal.invited | non | |
| hal.conference.end | 2014-02-07 | |
| hal.popular | non | |
| hal.audience | Nationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-02797948v1 | |
| bordeaux.COinS | ctx_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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