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A dense global velocity field based on GNSS observations: Preliminary Results / Carine Bruyninx (2012)
Titre : A dense global velocity field based on GNSS observations: Preliminary Results Type de document : Article/Communication Auteurs : Carine Bruyninx, Auteur ; Zuheir Altamimi , Auteur ; Matthias Becker, Auteur ; M. Craymer, Auteur ; L. Combrinck, Auteur ; A. Combrink, Auteur ; J.A. Dawson, Auteur ; R. Dietrich, Auteur ; R. Fernandes, Auteur ; Ramesh Govind, Auteur ; T.A. Herring, Auteur ; A. Kenyeres, Auteur ; R. King, Auteur ; C. Kreemer, Auteur ; David Lavallée, Auteur ; Juliette Legrand, Auteur ; L. Sánchez, Auteur ; R. Glenn Sellar, Auteur ; Z. Shen, Auteur ; Alvaro Santamaria Gomez, Auteur Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2012 Collection : International Association of Geodesy Symposia, ISSN 0939-9585 num. 136 Conférence : IAG 2009 Symposium, Geodesy for Planet Earth 31/08/2009 04/09/2009 Buenos Aires Argentine Proceedings Springer Importance : pp 19 - 26 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] champ de vitesse
[Termes IGN] coordonnées cartésiennes géocentriques
[Termes IGN] déformation verticale de la croute terrestre
[Termes IGN] réseau permanent EUREF
[Termes IGN] série temporelleRésumé : (auteur) In a collaborative effort with the regional sub-commissions within IAG sub-commission 1.3 “Regional Reference Frames”, the IAG Working Group (WG) on “Regional Dense Velocity Fields” (see http://epncb.oma.be/IAG) has made a first attempt to create a dense global velocity field. GNSS-based velocity solutions for more than 6,000 continuous and episodic GNSS tracking stations, were proposed to the WG in reply to the first call for participation issued in November 2008. The combination of a part of these solutions was done in a two-step approach: first at the regional level, and secondly at the global level. Comparisons between different velocity solutions show an RMS agreement between 0.3 and 0.5 mm/year resp. for the horizontal and vertical velocities. In some cases, significant disagreements between the velocities of some of the networks are seen, but these are primarily caused by the inconsistent handling of discontinuity epochs and solution numbers. In the future, the WG will re-visit the procedures in order to develop a combination process that is efficient, automated, transparent, and not more complex than it needs to be. Numéro de notice : C2009-062 Affiliation des auteurs : LAREG (1991-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1007/978-3-642-20338-1_3 Date de publication en ligne : 01/01/2011 En ligne : https://doi.org/10.1007/978-3-642-20338-1_3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102020 Estimating horizontal tropospheric gradients in DORIS data processing: preliminary results / Pascal Willis (2012)
Titre : Estimating horizontal tropospheric gradients in DORIS data processing: preliminary results Type de document : Article/Communication Auteurs : Pascal Willis , Auteur ; Yoaz E. Bar-Sever, Auteur ; Olivier Bock , Auteur Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2012 Collection : International Association of Geodesy Symposia, ISSN 0939-9585 num. 136 Conférence : IAG 2009 Symposium, Geodesy for Planet Earth 31/08/2009 04/09/2009 Buenos Aires Argentine Proceedings Springer Importance : pp 1013 - 1019 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] données DORIS
[Termes IGN] gradient de troposphère
[Termes IGN] orbitographie
[Termes IGN] positionnement ponctuel précis
[Termes IGN] retard troposphériqueRésumé : (auteur) Estimating horizontal tropospheric gradients is a common practice in VLBI and GPS data analyses. We investigate here the possibility to do the same for DORIS. We reprocessed all 2007 DORIS data for all satellites, using exactly the same strategy as the latest ignwd08 solution (Willis et al., Adv Space Res 45(12):1470–1480, 2010) but adding two new parameters per day to account for any asymmetry of the tropospheric delays. When averaged over the full year the DORIS north gradient estimates show a significant correlation with GPS estimates at 33 co-located sites. The east gradient is loosely determined with DORIS due to the north-south orientation of the satellites passes in 2007. Typical values are below 1 mm and North component shows a latitude dependency, negative values in the Northern hemisphere and positive values in the Southern hemisphere. The stacking of DORIS station weekly coordinates provides a more realistic value for a factor of unit weight when done using gradient estimation. Station coordinates also indicate a small improvement in internal consistency when compared to a 1-year position and velocity solution without estimating gradients. The DORIS-derived tropospheric gradients may still absorb other types of un-modeled errors, but estimation of such parameters should be investigated in more detail before reprocessing the entire DORIS data set in view of the next ITRF realization, following ITRF2008. Numéro de notice : C2009-034 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1007/978-3-642-20338-1_127 Date de publication en ligne : 26/07/2011 En ligne : https://doi.org/10.1007/978-3-642-20338-1_127 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91512 Flexible dataset combination and modelling by domain decomposition approaches / Isabelle Panet (2012)
Titre : Flexible dataset combination and modelling by domain decomposition approaches Type de document : Article/Communication Auteurs : Isabelle Panet , Auteur ; Yuki Kuroishi, Auteur ; Matthias Holschneider, Auteur Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2012 Collection : International Association of Geodesy Symposia, ISSN 0939-9585 num. 137 Projets : 2-Pas d'info accessible - article non ouvert / Conférence : IAG 2009, 7th Hotine-Marussi Symposium on Mathematical Geodesy 06/06/2009 10/06/2009 Rome Italie Proceedings Springer Importance : pp 67 - 73 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] compensation par moindres carrés
[Termes IGN] erreur systématique
[Termes IGN] filtrage du bruit
[Termes IGN] Japon
[Termes IGN] modèle de géopotentiel
[Termes IGN] modèle de géopotentiel local
[Termes IGN] ondelette
[Termes IGN] ondelette d'Abel-Poisson
[Termes IGN] transformation en ondelettesRésumé : (auteur) For geodetic and geophysical purposes, such as geoid determination or the study of the Earth’s structure, heterogeneous gravity datasets of various origins need to be combined over an area of interest, in order to derive a local gravity model at the highest possible resolution. The quality of the obtained gravity model strongly depends on the use of appropriate noise models for the different datasets in the combination process. In addition to random errors, those datasets are indeed often affected by systematic biases and correlated errors. Here we show how wavelets can be used to realize such combination in a flexible and economic way, and how the use of domain decomposition approaches allows to recalibrate the noise models in different wavebands and for different areas. We represent the gravity potential as a linear combination of Poisson multipole wavelets (Holschneider et al. 2003). We compute the wavelet model of the gravity field by regularized least-squares adjustment of the datasets. To solve the normal system, we apply the Schwarz iterative algorithms, based on a domain decomposition of the models space. Hierarchical scale subdomains are defined as subsets of wavelets at different scales, and for each scale, block subdomains are defined based on spatial splittings of the area. In the computation process, the data weights can be refined for each subdomain, allowing to take into account the effect of correlated noises in a simple way. Similarly, the weight of the regularization can be recalibrated for each subdomain, introducing non-stationarity in the a priori assumption of smoothness of the gravity field. We show and discuss examples of application of this method for regional gravity field modelling over a test area in Japan. Numéro de notice : C2009-035 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1007/978-3-642-22078-4_10 Date de publication en ligne : 18/11/2011 En ligne : https://doi.org/10.1007/978-3-642-22078-4_10 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91642 Geographic Information Science, GIScience 2012, 7th International Conference, Columbus, OH, USA, September 2012 / Ningchuan Xiao (2012)
Titre : Geographic Information Science, GIScience 2012, 7th International Conference, Columbus, OH, USA, September 2012 : Proceedings Type de document : Actes de congrès Auteurs : Ningchuan Xiao, Éditeur scientifique ; Mei-Po Kwan, Éditeur scientifique ; Michael F. Goodchild, Éditeur scientifique ; Shashi Shekhar, Éditeur scientifique Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2012 Collection : Lecture notes in Computer Science, ISSN 0302-9743 num. 7478 Conférence : GIScience 2012, 7th International Conference on geographic information science 18/09/2012 21/09/2012 Columbus Ohio - Etats-Unis Proceedings Springer Importance : 367 p. Format : 15 x 23 cm ISBN/ISSN/EAN : 978-3-642-33023-0 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] données massives
[Termes IGN] Infrastructure de donnéesRésumé : (éditeur) This book constitutes the refereed proceedings of the 7th International Conference on Geographic Information Science, GIScience 2012, held in Columbus, OH, USA in September 2012. The 26 full papers presented were carefully reviewed and selected from 57 submissions. While the traditional research topics are well reflected in the papers, emerging topics that involve new research hot-spots such as cyber infrastructure, big data, web-based computing also occupy a significant portion of the volume. Note de contenu : • Automated Centerline Delineation to Enrich the National Hydrography Dataset / Anderson-Tarver, Chris (et al.)
• Evolution Strategies for Optimizing Rectangular Cartograms / Buchin, Kevin (et al.)
• Context-Aware Similarity of Trajectories / Buchin, Maike (et al.)
• Generating Named Road Vector Data from Raster Maps / Chiang, Yao-Yi (et al.)
• An Ordering of Convex Topological Relations / Dube, Matthew P. (et al.)
• Toward Web Mapping with Vector Data / Gaffuri, Julien
• spatial@linkedscience – Exploring the Research Field of GIScience with Linked Data / Keßler, Carsten (et al.)
• Crowdsourcing Satellite Imagery Analysis: Study of Parallel and Iterative Models / Maisonneuve, Nicolas (et al.)
• Quantifying Resolution Sensitivity of Spatial Autocorrelation: A Resolution Correlogram Approach / Mohan, Pradeep (et al.)
• Nittel, Silvia (et al.)
• High-Level Event Detection in Spatially Distributed Time Series / Rude, Avinash (et al.)
• Towards Vague Geographic Data Warehouses / Siqueira, Thiago Luís Lopes (et al.)
• Measuring the Influence of Built Environment on Walking Behavior: An Accessibility Approach / Sun, Guibo (et al.)
• Social Welfare to Assess the Global Legibility of a Generalized Map / Touya, Guillaume
• Investigations into the Cognitive Conceptualization and Similarity Assessment of Spatial Scenes / Wallgrün, Jan Oliver (et al.)
• A Qualitative Bigraph Model for Indoor Space / Walton, Lisa A. (et al.)
• Dynamic Refuse Collection Strategy Based on Adjacency Relationship between Euler Cycles / Watanabe, Toyohide (et al.)
• Impact of Indoor Location Information Reliability on Users’ Trust of an Indoor Positioning System / Wei, Ting (et al.)
• Ontology for the Engineering of Geospatial Systems / Wiegand, Nancy
• Preserving Detail in a Combined Land Use Ontology / Wiegand, Nancy
• The Maptree: A Fine-Grained Formal Representation of Space / Worboys, Michael
• Automatic Creation of Crosswalk for Geospatial Metadata Standard Interoperability / Yang, Hui (et al.)
• A Dartboard Network Cut Based Approach to Evacuation Route Planning: A Summary of Results / Yang, KwangSoo (et al.)
• Hybrid Geo-spatial Query Methods on the Semantic Web with a Spatially-Enhanced Index of DBpedia / Younis, Eman M. G. (et al.)Numéro de notice : 17079 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Actes DOI : 10.1007/978-3-642-33024-7 En ligne : https://doi.org/10.1007/978-3-642-33024-7 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79426 ContientRéservation
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Titre : Geospatial free and open source software in the 21st Century Type de document : Monographie Auteurs : Erwan Bocher, Éditeur scientifique ; Markus Neteler, Éditeur scientifique Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2012 Importance : 275 p. Format : 16 x 24 cm ISBN/ISSN/EAN : 978-3-642-10595-1 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] données localisées
[Termes IGN] GeoWeb
[Termes IGN] langage de programmation
[Termes IGN] logiciel libreRésumé : (éditeur) This book contains papers presented at the first Open Source Geospatial Research Symposium held in Nantes City, France, 8-10 July, 2009. It brings together insights and ideas in the fields of Geospatial Information and Geoinformatics. It demonstrates the scientific community dynamism related to open source and free software as well as in defining new concepts, standards or tools. Numéro de notice : 15281 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Recueil / ouvrage collectif DOI : 10.1007/978-3-642-10595-1 En ligne : https://doi.org/10.1007/978-3-642-10595-1 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=101208 GeOxygene: Built on top of the expertise of the French NMA to host and share advanced GI Science research results / Bénédicte Bucher (2012)PermalinkPermalinkImproved GPS data analysis strategy for tide gauge benchmark monitoring / Alvaro Santamaria Gomez (2012)PermalinkOcean Loading in Brittany, Northwest France: Impact of the GPS Analysis Strategy / Joëlle Nicolas (2012)PermalinkProtocols and assisted tools for effective image-based modeling of architectural elements / Nicolas Nony (2012)PermalinkRecent improvements in DORIS data processing at IGN in view of ITRF2008, the IGNWD08 Solution / Pascal Willis (2012)PermalinkPermalinkPermalinkPermalinkPermalinkDiscovery and integration of Web 2.0 content into Geospatial Information Infrastructures : a use case in wild fire monitoring / M. Nunez-Redo (22/08/2011)PermalinkConception of a GIS-platform to simulate urban densification based on the analysis of topographic data / Anne Ruas (01/07/2011)PermalinkPermalinkSEREDONA : a web platform to integrate historical geographic data into current georeferenced frameworks / Eric Grosso (01/07/2011)PermalinkPermalinkSimultaneous & topologically-safe line simplification for a variable-scale planar partition / Martijn Meijers (31/01/2011)PermalinkAdvances in cartography and GIScience: selection from ICC [International Cartographic Conference] 2011, Volume 1. Conference proceedings / Anne Ruas (2011)PermalinkAdvances in cartography and GIScience: selection from ICC [International Cartographic Conference] 2011, Volume 2. Conference proceedings / Anne Ruas (2011)PermalinkPermalinkPermalink