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Titre : Earth and Space Science Open Archive ESSOAr Type de document : Site web Auteurs : American Geophysical Union, Auteur Editeur : Washington DC [Maryland - Etats-Unis] : American Geophysical Union AGU Année de publication : 2019 Langues : Anglais (eng) Résumé : (auteur) The Earth and Space Science Open Archive (ESSOAr) is a community server established to accelerate the open discovery and dissemination of earth, environmental, and space science research by archiving and sharing early research outputs, including preprints, presentations from major scientific meetings, and important documents of scholarly societies. Numéro de notice : 17645 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Site internet En ligne : https://www.essoar.org/ Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=97631 Contient
- Comparison of atmospheric mass density models using a new data source: COSMIC satellite ephemerides / Yang Yang (2020)
- Are there detectable common aperiodic displacements at ITRF co-location sites? / Maylis Teyssendier de la Serve (2021)
- Analysis of IGS repro3 station position time series [diaporama] / Paul Rebischung (2021)
Titre : AGU 2015 Fall Meeting, San Francisco, 14 - 18 December 2015 Type de document : Actes de congrès Auteurs : Anonyme, Auteur Editeur : Washington DC [Maryland - Etats-Unis] : American Geophysical Union AGU Année de publication : 2015 Conférence : AGU 2015 Fall Meeting 14/10/2015 18/12/2015 San Francisco Californie - Etats-Unis Langues : Anglais (eng) Numéro de notice : 17335 Affiliation des auteurs : non IGN Nature : Actes DOI : sans En ligne : https://agu.confex.com/agu/fm15/meetingapp.cgi/Home/0 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83299 Tropical forest structure characterization using airborne lidar data: an individual tree level approach / António Ferraz (dec 2015)
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Titre : Tropical forest structure characterization using airborne lidar data: an individual tree level approach Type de document : Article/Communication Auteurs : António Ferraz , Auteur ; Sassan Saatchi, Auteur ; Clément Mallet
, Auteur ; Victoria Meyer, Auteur
Editeur : Washington DC [Maryland - Etats-Unis] : American Geophysical Union AGU Année de publication : dec 2015 Conférence : AGU 2015 Fall Meeting 14/10/2015 18/12/2015 San Francisco Californie - Etats-Unis Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] arbre (flore)
[Termes IGN] biomasse aérienne
[Termes IGN] distribution spatiale
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] forêt tropicale
[Termes IGN] hauteur des arbres
[Termes IGN] houppier
[Termes IGN] Panama
[Termes IGN] segmentation
[Termes IGN] semis de points
[Termes IGN] structure d'un peuplement forestierRésumé : (auteur) Fine scale tropical forest structure characterization has been performed by means of field measurements techniques that record both the specie and the diameter at the breast height (dbh) for every tree within a given area. Due to dense and complex vegetation, additional important ecological variables (e.g. the tree height and crown size) are usually not measured because they are hardly recognized from the ground. The poor knowledge on the 3D tropical forest structure has been a major limitation for the understanding of different ecological issues such as the spatial distribution of carbon stocks, regeneration and competition dynamics and light penetration gradient assessments. Airborne laser scanning (ALS) is an active remote sensing technique that provides georeferenced distance measurements between the aircraft and the surface. It provides an unstructured 3D point cloud that is a high-resolution model of the forest. This study presents the first approach for tropical forest characterization at a fine scale using remote sensing data. The multi-modal lidar point cloud is decomposed into 3D clusters that correspond to single trees by means of a technique called Adaptive Mean Shift Segmentation (AMS3D). The ability of the corresponding individual tree metrics (tree height, crown area and crown volume) for the estimation of above ground biomass (agb) over the 50 ha CTFS plot in Barro Colorado Island is here assessed. We conclude that our approach is able to map the agb spatial distribution with an error of nearly 12% (RMSE=28 Mg ha-1) compared with field-based estimates over 1ha plots. Numéro de notice : C2015-033 Affiliation des auteurs : LASTIG MATIS+Ext (2012-2019) Thématique : FORET/IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://agu.confex.com/agu/fm15/meetingapp.cgi/Paper/75802 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83298
Titre : Gravity field modeling in space and time Type de document : Article/Communication Auteurs : Shuo (2) Wang, Auteur ; Isabelle Panet , Auteur ; Guillaume Ramillien, Auteur ; Frédéric Guilloux, Auteur
Editeur : Washington DC [Maryland - Etats-Unis] : American Geophysical Union AGU Année de publication : 2014 Conférence : AGU 2014, Fall Meeting 15/12/2014 19/12/2014 San Francisco Californie - Etats-Unis Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] levé gravimétrique
[Termes IGN] ondelette d'Abel-Poisson
[Termes IGN] ondelette de HaarRésumé : (auteur) The Earth constantly deforms as it undergoes dynamic phenomena, such as earthquakes, post-glacial rebound and water displacement in its fluid envelopes. These processes have different spatial and temporal scales and are accompanied by mass displacements, which create temporal variations of the gravity field. Since 2002, satellite missions such as GOCE and GRACE provide an unprecedented view of the spatial and temporal variations of the Earth's gravity field. Gravity models built from these data are essential to study the Earth’s dynamic processes. The gravity field and its time variations are usually modelled using spatial spherical harmonics functions averaged over a fixed period, as 10 days or 1 month. This approach is well suited for modeling global phenomena. To better estimate gravity variations related to local and/or transient processes, such as earthquakes or floods, and take into account the trade-off between temporal and spatial resolution resulting from the satellites sampling, we propose to model the gravity field as a four-dimensional quantity using localized functions in space and time. For that, we first design a four-dimensional multi-scale basis, well localized both in space and time, by combining spatial Poisson wavelets with an orthogonal temporal wavelet basis. In such approach, the temporal resolution can be adjusted to the spatial one. Then, we set-up the inverse problem to model potential differences between the twin GRACE satellites in 4D, and propose a regularization using prior knowledge on the water cycle signal amplitude. We validate our 4D modelling method on a synthetic test over Africa, using synthetic data on potential differences along the orbits constructed from a global hydrological model. A perspective of this work is to apply it on real data, in order to better model and understand the non-stationnary gravity field variations and associated processes at regional scales. Numéro de notice : C2014-044 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Poster nature-HAL : Poster-avec-CL DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=99902 Documents numériques
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Gravity field modeling in space and time - pdf auteur - posterAdobe Acrobat PDFJournal of geophysical research, JGR [rouge] Solid Earth (Bulletin de Journal of geophysical research : Solid Earth) / American Geophysical Union
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Titre : Journal of geophysical research, JGR [rouge] Solid Earth Type de document : Périodique Auteurs : American Geophysical Union, Auteur Editeur : Washington DC [Maryland - Etats-Unis] : American Geophysical Union AGU Année de publication : 2001 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géophysique interne Numéro de notice : 194-0102 Nature : Numéro de périodique Permalink : https://documentation.ensg.eu/index.php?lvl=bulletin_display&id=15876 [n° ou bulletin]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 194-01021 RAB Revue Centre de documentation En réserve 3L Disponible Journal of geophysical research, JGR [rouge] Solid Earth (Bulletin de Journal of geophysical research : Solid Earth) / American Geophysical Union
PermalinkJournal of geophysical research, JGR [rouge] Solid Earth (Bulletin de Journal of geophysical research : Solid Earth) / American Geophysical Union
PermalinkJournal of geophysical research, JGR [rouge] Solid Earth (Bulletin de Journal of geophysical research : Solid Earth) / American Geophysical Union
PermalinkJournal of geophysical research, JGR [rouge] Solid Earth (Bulletin de Journal of geophysical research : Solid Earth) / American Geophysical Union
PermalinkJournal of geophysical research, JGR [rouge] Solid Earth (Bulletin de Journal of geophysical research : Solid Earth) / American Geophysical Union
PermalinkJournal of geophysical research, JGR [rouge] Solid Earth (Bulletin de Journal of geophysical research : Solid Earth) / American Geophysical Union
PermalinkJournal of geophysical research, JGR [rouge] Solid Earth (Bulletin de Journal of geophysical research : Solid Earth) / American Geophysical Union
PermalinkJournal of geophysical research, JGR [rouge] Solid Earth (Bulletin de Journal of geophysical research : Solid Earth) / American Geophysical Union
PermalinkJournal of geophysical research, JGR [rouge] Solid Earth (Bulletin de Journal of geophysical research : Solid Earth) / American Geophysical Union
PermalinkJournal of geophysical research, JGR [rouge] Solid Earth (Bulletin de Journal of geophysical research : Solid Earth) / American Geophysical Union
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