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Elevation models for reproducible evaluation of terrain representation / Patrick Kennelly in Cartography and Geographic Information Science, vol 48 n° 1 (January 2021)
[article]
Titre : Elevation models for reproducible evaluation of terrain representation Type de document : Article/Communication Auteurs : Patrick Kennelly, Auteur ; Tom Patterson, Auteur ; Bernhard Jenny, Auteur ; et al., Auteur Année de publication : 2021 Article en page(s) : pp 63 - 77 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] altitude
[Termes IGN] données multiéchelles
[Termes IGN] figuré du terrain
[Termes IGN] modèle numérique de surface
[Termes IGN] réalité de terrain
[Termes IGN] relief
[Termes IGN] représentation du relief
[Termes IGN] reproductibilité
[Termes IGN] visualisation de donnéesRésumé : (auteur) This paper proposes elevation models to promote, evaluate, and compare various terrain representation techniques. Our goal is to increase the reproducibility of terrain rendering algorithms and techniques across different scales and landscapes. We introduce elevation models of varying terrain types, available to the user at no cost, with minimal common data imperfections such as missing data values, resampling artifacts, and seams. Three multiscale elevation models are available, each consisting of a set of elevation grids, centered on the same geographic location, with increasing cell sizes and spatial extents. We also propose a collection of single-scale elevation models of archetypal landforms including folded ridges, a braided riverbed, active and stabilized sand dunes, and a volcanic caldera. An inventory of 78 publications with a total of 155 renderings illustrating terrain visualization techniques guided the selection of landform types in the elevation models. The benefits of using the proposed elevation models include straightforward comparison of terrain representation methods across different publications and better documentation of the source data, which increases the reproducibility of terrain representations. Numéro de notice : A2021-715 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/15230406.2020.1830856 Date de publication en ligne : 04/11/2020 En ligne : https://doi.org/10.1080/15230406.2020.1830856 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96459
in Cartography and Geographic Information Science > vol 48 n° 1 (January 2021) . - pp 63 - 77[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 032-2021011 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Geodetic sciences : theory, applications and recent developments Type de document : Monographie Auteurs : Bihter Erol, Éditeur scientifique ; Serdar Erol, Éditeur scientifique Editeur : London [UK] : IntechOpen Année de publication : 2021 Importance : 200 p. Format : 16 x 24 cm ISBN/ISSN/EAN : 978-1-83962-768-2 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] altimétrie par radar
[Termes IGN] analyse comparative
[Termes IGN] champ de gravitation
[Termes IGN] données GNSS
[Termes IGN] données GRACE
[Termes IGN] force de gravitation
[Termes IGN] géodynamique
[Termes IGN] marégraphe
[Termes IGN] niveau de la mer
[Termes IGN] observation de la Terre
[Termes IGN] tectonique des plaquesRésumé : (Editeur) Advances in space-borne technologies lead to improvements in observations and have a notable impact on geodesy and its applications. As a consequence of these improvements in data accuracies, spatial and temporal resolutions, as well as the developments in the methodologies, more detailed analyses of the Earth and a deeper understanding of its state and dynamic processes are possible today. From this perspective, this book is a collection of the selected reviews and case-study articles that report the advances in methodology and applications in geodesy. The chapters in the book are mainly dedicated to the Earth’s gravity field theory and applications, sea level monitoring and analysis, navigation satellite systems data and applications, and monitoring networks for tectonic deformations. This collection is a current state analysis of the geodetic research in theory and applications in today’s modern world. Note de contenu :
1. The Earth’s Gravity Field Role in Geodesy and Large-Scale Geophysics
2. On Moho Determination by the Vening Meinesz-Moritz Technique
3. The Gravity Effect of Topography: A Comparison among Three Different Methods
4. Continental Water Storage Changes Sensed by GRACE Satellite Gravimetry
5. Radar Satellite Altimetry in Geodesy - Theory, Applications and Recent Developments
6. Coastal Sea Level Trends from a Joint Use of Satellite Radar Altimetry, GPS and Tide Gauges: Case Study of the Northern Adriatic Sea
7. Beyond Mapping Functions and Gradients
8. GNSS Networks for Geodynamics in the Caribbean, Northwestern South America, and Central AmericaNuméro de notice : 26670 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Recueil / ouvrage collectif DOI : 10.5772/intechopen.87679 Date de publication en ligne : 30/06/2021 En ligne : https://doi.org/10.5772/intechopen.87679 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=98927 Height system unification and estimation of the lithospheric structure beneath Vietnam through high-resolution gravity field and quasigeoid modeling / Dinh Toan Vu (2021)
Titre : Height system unification and estimation of the lithospheric structure beneath Vietnam through high-resolution gravity field and quasigeoid modeling Titre original : Unification du système de hauteur et estimation de la structure lithosphérique sous le Vietnam utilisant la modélisation du champ de gravité et du quasigéoïde à haute résolution Type de document : Thèse/HDR Auteurs : Dinh Toan Vu, Auteur ; Sylvain Bonvalot, Directeur de thèse ; Sean L. Bruinsma, Directeur de thèse Editeur : Toulouse : Université de Toulouse Année de publication : 2021 Importance : 234 p. Format : 21 x 30 cm Note générale : bibliographie
Thèse en vue de l'obtention du Doctorat de l'Université de Toulouse délivrée par l'Université Toulouse 3 - Paul SabatierLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] anomalie de pesanteur
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] données GNSS
[Termes IGN] données GOCE
[Termes IGN] géoïde gravimétrique
[Termes IGN] géoïde local
[Termes IGN] lithosphère
[Termes IGN] modèle de géopotentiel local
[Termes IGN] nivellement
[Termes IGN] quasi-géoïde
[Termes IGN] Viet NamIndex. décimale : THESE Thèses et HDR Résumé : (auteur) The goal of this work was twofold. The first part was devoted to the research of the size and physical shape of the Earth in Vietnam through the determination of a local gravimetric quasigeoid model. The second part was to better constrain the Earth's interior structure beneath Vietnam by determining the Moho and Lithosphere-Asthenosphere Boundary (LAB) depth models. For the first objective, a high-resolution gravimetric quasigeoid model for Vietnam and its surrounding areas was determined based on new land gravity data in combination with fill-in data where no gravity data existed. The resulting quasigeoid model was evaluated using 812 GNSS/levelling points in the study region. This comparison indicates that the quasigeoid model has a standard deviation of 9.7 cm and 50 cm in mean bias. This new local quasigeoid model for Vietnam represents a significant improvement over the global models EIGEN-6C4 and EGM2008, which have standard deviations of 19.2 and 29.1 cm, respectively, when compared to the GNSS/levelling data. An essential societal and engineering application of the gravimetric quasigeoid is in GNSS levelling, and a vertical offset model for Vietnam and its surrounding areas was determined based on the GNSS/levelling points and gravimetric-only quasigeoid model for this purpose. The offset model was evaluated using cross-validation technique by comparing with GNSS/levelling data. Results indicate that the offset model has a standard deviation of 5.9 cm in the absolute sense. Thanks to this offset model, GNSS levelling can be carried out over most of Vietnam's territory complying to third-order levelling requirements, while the accuracy requirements for fourth-order levelling networks is met for the entire country. To unify the height system towards the International Height Reference Frame (IHRF), the zero-height geopotential value for the Vietnam Local Vertical Datum W_0^LVD was determined based on two approaches: 1) Using high-quality GNSS/levelling data and the estimated gravimetric quasigeoid model, 2) Using the Geodetic Boundary Value Problem (GBVP) approach based on the GOCE global gravity field model enhanced with terrestrial gravity data. This geopotential value can be used to connect the height system of Vietnam with the neighboring countries. Moreover, the GBVP approach was also used for direct determination of the gravity potential on the surface at three GNSS Continuously Operating Reference Station (CORS) stations at epoch 2018.0 in Vietnam. Based on time series of the vertical component derived from these GNSS observations as well as InSAR data, temporal variations in the geopotential were also estimated on these permanent GNSS stations. This enables monitoring of the vertical datum and detect possible deformation. These stations may thus contribute to increase the density of reference points in the IHRF for this region. For the second objective, the local quasigeoid model was first converted to the geoid. Then, high-resolution Moho and LAB depth models were determined beneath Vietnam based on the local isostatic hypothesis using the geoid height derived from the estimated geoid, elevation data and thermal analysis. From new land gravity data, a complete grid and map of gravity anomalies i.e., Free-air, Bouguer and Isostatic was determined for the whole of Vietnam. The Moho depth was also computed based on the gravity inversion using the Bouguer gravity anomaly grid. All new models are computed at 1' resolution. The resulting Moho and LAB depth models were evaluated using available seismic data as well as global and local lithospheric models available in the study region. [...] Note de contenu : 1- Introduction
2- Theoretical basis
3- Data and map of gravity anomalies
4- The gravimetric quasigeoid solution
5- Quasigeoïd application for GNSS levelling and height system unification
6- Quasigeoid application for determination of the lithospheric structure
7- Conclusion and perspectivesNuméro de notice : 28495 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse française Note de thèse : Thèse de Doctorat : Sciences de la Terre et des Planètes Solides : Toulouse : 2021 Organisme de stage : Geosciences Environnement Toulouse GET DOI : sans En ligne : http://www.theses.fr/2021TOU30050 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=99240
Titre : Le marégraphe de Marseille Type de document : Article/Communication Auteurs : Alain Coulomb , Auteur Editeur : Paris : Bureau des longitudes BDL Année de publication : 2021 Projets : BDL1795-1932 / Schiavon, Martina Importance : 4 p. Note générale : bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] données marégraphiques
[Termes IGN] histoire de la cartographie
[Termes IGN] marégraphe
[Termes IGN] Marseille
[Termes IGN] montée du niveau de la merRésumé : (documentaire) Après un rappel des définition du marégraphe et du marégramme, sont exposés l'histoire du marégraphe de Marseille et son intérêt scientifique toujours actuel. Numéro de notice : A2021-303 Affiliation des auteurs : IGN (2020- ) Autre URL associée : vers HAL Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtSansCL DOI : sans Date de publication en ligne : 11/01/2021 En ligne : http://bdl.ahp-numerique.fr/focus-instruments-ac-maregraphe-marseille Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=97645 Le parallèle des Pyrénées / Yves Maugard (2021)
Titre : Le parallèle des Pyrénées : Détermination des hauteurs des sommets ; La comparaison du niveau des deux mers 1825 - 1827 Type de document : Monographie Auteurs : Yves Maugard, Auteur Editeur : Auto-Edition Année de publication : 2021 Importance : 107 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-2-9578363-0-7 Note générale : bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Géodésie ancienne
[Termes IGN] altitude
[Termes IGN] dix-neuvième siècle
[Termes IGN] niveau de la mer
[Termes IGN] nivellement
[Termes IGN] parallèle
[Termes IGN] Pyrénées (montagne)
[Termes IGN] triangulationIndex. décimale : 30.01 Géodésie ancienne (postérieure à 1939 et en bon état) Note de contenu : 1- Historique
2- Notions de géodésie et de topographie
3- Opérations géodésiques de 1825 - 1827
4- Nivellement des sites
5- Les calculs
6- Résultats et altitude du Crabère
7- ConclusionNuméro de notice : 28376 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=98552 Exemplaires(1)
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