Catalogue en ligne IGN

IAG 150 Years / Chris Rizos (2016)

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Titre :	IAG 150 Years : Proceedings of the IAG Scientific Assembly in Postdam, Germany, 2013
Type de document :	Actes de congrès
Auteurs :	Chris Rizos, Éditeur scientifique ; Pascal Willis , Éditeur scientifique
Editeur :	Berlin, Heidelberg, Vienne, New York, ... : Springer
Année de publication :	2016
Collection :	International Association of Geodesy Symposia, ISSN 0939-9585 num. 143
Conférence :	IAG 2013, Scientific assembly, IAG 150 Years Postdam Allemagne Proceedings Springer
Importance :	617 p.
ISBN/ISSN/EAN :	978-3-319-24603-1
Langues :	Anglais (eng)
Résumé :	(éditeur) This proceedings contains a selection of peer-reviewed papers presented at the IAG Scientific Assembly, Postdam, Germany, 1-6 September, 2013. The scientific sessions were forcussed on the definition, implementation and scientific applications of reference frames; gravity field determination and applications; the observation and assessment of earth hazards. It presents a collection of the contributions on the applications of earth rotations dynamics, on observation systems and services as well as on imaging and positioning techniques and its applications.
Numéro de notice :	sans
Affiliation des auteurs :	LASTIG LAREG+Ext (2012-mi2018)
Thématique :	POSITIONNEMENT
Nature :	Actes
nature-HAL :	DirectOuvrColl/Actes
DOI :	10.1007/978-3-319-24603-1
En ligne :	https://doi.org/10.1007/978-3-319-24603-1
Format de la ressource électronique :	URL
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=79189

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The International DORIS Service (IDS) : Recent developments in preparation for ITRF2013 / Pascal Willis (2016)

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contenu dans IAG 150 Years / Chris Rizos (2016)

Titre :	The International DORIS Service (IDS) : Recent developments in preparation for ITRF2013
Type de document :	Article/Communication
Auteurs :	Pascal Willis , Auteur ; Franck G. Lemoine, Auteur ; Guilhem Moreaux, Auteur ; Laurent Soudarin, Auteur ; Pascale Ferrage, Auteur ; J.C. Ries, Auteur ; Michiel Otten, Auteur ; Jérôme Saunier , Auteur ; Carey E. Noll, Auteur ; Richard Biancale, Auteur ; Brian Luzum, Auteur
Editeur :	Berlin, Heidelberg, Vienne, New York, ... : Springer
Année de publication :	2016
Collection :	International Association of Geodesy Symposia, ISSN 0939-9585 num. 143
Conférence :	IAG 2013, Scientific assembly, IAG 150 Years Postdam Allemagne Proceedings Springer
Importance :	pp 631 - 640
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] données Jason [Termes IGN] International DORIS Service [Termes IGN] International Terrestrial Reference Frame [Termes IGN] Jason [Termes IGN] mouvement du pôle
Résumé :	(auteur) The International DORIS Service (IDS) was created in 2003 under the umbrella of the International Association of Geodesy (IAG) to foster scientific research related to the French DORIS tracking system and to deliver scientific products, mostly related to the International Earth rotation and Reference systems Service (IERS). We first present some general background related to the DORIS system (current and planned satellites, current tracking network and expected evolution) and to the general IDS organization (from Data Centers, Analysis Centers and Combination Center). Then, we discuss some of the steps recently taken to prepare the IDS submission to ITRF2013 (combined weekly time series based on individual solutions from several Analysis Centers). In particular, recent results obtained from the Analysis Centers and the Combination Center show that improvements can still be made when updating physical models of some DORIS satellites, such as Envisat, Cryosat-2 or Jason-2. The DORIS contribution to ITRF2013 should also benefit from the larger number of ground observations collected by the last generation of DGXX receivers (first instrument being onboard Jason-2 satellite). In particular for polar motion, sub-milliarcsecond accuracy seems now to be achievable. Weekly station positioning internal consistency also seems to be improved with a larger DORIS constellation.
Numéro de notice :	C2013-051
Affiliation des auteurs :	LASTIG LAREG+Ext (2012-mi2018)
Thématique :	POSITIONNEMENT
Nature :	Communication
nature-HAL :	ComAvecCL&ActesPubliésIntl
DOI :	10.1007/1345_2015_164
Date de publication en ligne :	13/08/2015
En ligne :	http://dx.doi.org/10.1007/1345_2015_164
Format de la ressource électronique :	URL
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=78595

DPOD2008, A DORIS-oriented terrestrial reference frame for precise orbit determination / Pascal Willis (2016)

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contenu dans IAG 150 Years / Chris Rizos (2016)

Titre :	DPOD2008, A DORIS-oriented terrestrial reference frame for precise orbit determination
Type de document :	Article/Communication
Auteurs :	Pascal Willis , Auteur ; Nikita P. Zelensky, Auteur ; J.C. Ries, Auteur ; Laurent Soudarin, Auteur ; L. Cerri, Auteur ; Guilhem Moreaux, Auteur ; Franck G. Lemoine, Auteur ; Michiel Otten, Auteur ; Donald F. Argus, Auteur ; Michael B. Heflin, Auteur
Editeur :	Berlin, Heidelberg, Vienne, New York, ... : Springer
Année de publication :	2016
Collection :	International Association of Geodesy Symposia, ISSN 0939-9585 num. 143
Conférence :	IAG 2013, Scientific assembly, IAG 150 Years Postdam Allemagne Proceedings Springer
Importance :	pp 175 - 181
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Géodésie spatiale [Termes IGN] International Terrestrial Reference Frame [Termes IGN] Jason [Termes IGN] orbitographie [Termes IGN] repère de référence [Termes IGN] station de poursuite
Résumé :	(auteur) While accuracy of tracking station coordinates is of key importance for Precise Orbit Determination (POD) for altimeter satellites, reliability and operationality are also of great concern. In particular, while recent ITRF realizations should be the most accurate at the time of their computation, they cannot be directly used by the POD groups for operational consideration for several reasons such as new stations appearing in the network or new discontinuities affecting station coordinates. For POD purposes, we computed a new DORIS terrestrial frame called DPOD2008 derived from ITRF2008 (as previously done by DPOD2005 with regards to ITRF2005). In a first step, we will present the method used to validate the past ITRF2008 using more recent DORIS data and to derive new station positions and velocities, when needed. In particular, discontinuities in DORIS station positions and/or velocities are discussed. To derive new DORIS station coordinates, we used recent DORIS weekly time series of coordinates, recent GPS relevant time series at co-located sites and also dedicated GPS campaigns performed by IGN when installing new DORIS beacons. DPOD2008 also contains additional metadata that are useful when processing DORIS data, for example, periods during which DORIS data should not be used or at least for which data should be downweighted. In several cases, a physical explanation can be found for such temporary antenna instability. We then demonstrate improvements seen when using different reference frames, such as the original ITRF2008 solution, for precise orbit determination of altimeter satellites TOPEX/Poseidon and Jason-2 over selected periods spanning 1993–2013.
Numéro de notice :	C2013-052
Affiliation des auteurs :	LASTIG LAREG+Ext (2012-mi2018)
Thématique :	POSITIONNEMENT
Nature :	Communication
nature-HAL :	ComAvecCL&ActesPubliésIntl
DOI :	10.1007/1345_2015_125
Date de publication en ligne :	07/07/2015
En ligne :	http://dx.doi.org/10.1007/1345_2015_125
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=78500

IAG history, the years of World Wars and aftermath (1917-1959) / Claude Boucher (2016)

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contenu dans IAG 150 Years / Chris Rizos (2016)

Titre :	IAG history, the years of World Wars and aftermath (1917-1959)
Type de document :	Article/Communication
Auteurs :	Claude Boucher , Auteur ; Pascal Willis , Auteur
Editeur :	Berlin, Heidelberg, Vienne, New York, ... : Springer
Année de publication :	2016
Collection :	International Association of Geodesy Symposia, ISSN 0939-9585 num. 143
Conférence :	IAG 2013, Scientific assembly, IAG 150 Years Postdam Allemagne Proceedings Springer
Importance :	pp 19 - 25
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Géodésie [Termes IGN] géodésie [Termes IGN] géodésie ancienne
Résumé :	(auteur) In the frame of the celebration of the 150th birthday of the International Association of Geodesy (IAG), this contribution is devoted to the period 1917–1959, starting at the move of the IAG Central Bureau from Potsdam to Paris, up to the occurrence of space technology. Among important aspects, the evolution of international cooperation is presented, with crucial geopolitical aspects (mostly around World Wars I and II) as well as drastic technological innovations. A particular important issue is the creation of the International Union of Geodesy and Geophysics (IUGG) and the inclusion of IAG. The evolution of the IAG structure and organization is presented, as well as its links with other scientific entities.
Numéro de notice :	C2013-002
Affiliation des auteurs :	LASTIG LAREG+Ext (2012-mi2018)
Thématique :	POSITIONNEMENT
Nature :	Communication
nature-HAL :	ComAvecCL&ActesPubliésIntl
DOI :	10.1007/1345_2015_96
Date de publication en ligne :	13/05/2015
En ligne :	http://dx.doi.org/10.1007/1345_2015_96
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=78643

Quality evaluation of the weekly vertical loading effects induced from continental water storage models / Z. Li (2016)

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contenu dans IAG 150 Years / Chris Rizos (2016)

Titre :	Quality evaluation of the weekly vertical loading effects induced from continental water storage models
Type de document :	Article/Communication
Auteurs :	Z. Li, Auteur ; Tonie M. van Dam, Auteur ; Xavier Collilieux , Auteur ; Zuheir Altamimi , Auteur ; Paul Rebischung , Auteur ; Samuel Nahmani , Auteur
Editeur :	Berlin, Heidelberg, Vienne, New York, ... : Springer
Année de publication :	2016
Collection :	International Association of Geodesy Symposia, ISSN 0939-9585 num. 143
Conférence :	IAG 2013, Scientific assembly, IAG 150 Years Postdam Allemagne Proceedings Springer
Importance :	pp 45 - 54
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] Amérique du nord [Termes IGN] coordonnées GPS [Termes IGN] eaux continentales [Termes IGN] effet de charge [Termes IGN] hauteur ellipsoïdale [Termes IGN] série temporelle
Résumé :	(auteur) To remove continental water storage (CWS) signals from the GPS data, CWS mass models are needed to obtain predicted surface displacements. We compared weekly GPS height time series with five CWS models: (1) the monthly and (2) three-hourly Global Land Data Assimilation System (GLDAS); (3) the monthly and (4) one-hourly Modern-Era Retrospective Analysis for Research and Applications (MERRA); (5) the six-hourly National Centers for Environmental Prediction-Department of Energy (NCEP-DOE) global reanalysis products (NCEP-R-2). We find that of the 344 selected global IGS stations, more than 77% of stations have their weighted root mean square (WRMS) reduced in the weekly GPS height by using both the GLDAS and MERRA CWS products to model the surface displacement, and the best improvement concentrate mainly in North America and Eurasia. We find that the one-hourly MERRA-Land dataset is the most appropriate product for modeling weekly vertical surface displacement caused by CWS variations. The three-hourly GLDAS data ranks the second, while the GLDAS and MERRA monthly products rank the third. The higher spatial resolution MERRA product improves the performance of the CWS model in reducing the scatter of the GPS height by about 2–6% compared with the GLDAS. Under the same spatial resolution, the higher temporal resolution could also improve the performance by almost the same magnitude. We also confirm that removing the ATML and NTOL effects from the weekly GPS height would remarkably improve the performance of CWS model in correcting the GPS height by at least 10%, especially for coastal and island stations. Since the GLDAS product has a much greater latency than the MERRA product, MERRA would be a better choice to model surface displacements from CWS. Finally, we find that the NCEP-R-2 data is not sufficiently precise to be used for this application. Further work is still required to determine the reason.
Numéro de notice :	C2013-011
Affiliation des auteurs :	LASTIG LAREG+Ext (2012-mi2018)
Thématique :	POSITIONNEMENT
Nature :	Communication
nature-HAL :	ComAvecCL&ActesPubliésIntl
DOI :	10.1007/1345_2015_174
Date de publication en ligne :	30/07/2015
En ligne :	https://doi.org/10.1007/1345_2015_174
Format de la ressource électronique :	URL article
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=91895

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L'actu ! voici les beaux jours et l'envol des étudiants vers leurs stages

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2014-2022 IGN

Centre dedocumentation
scientifique