Descripteur
Documents disponibles dans cette catégorie (93)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Etendre la recherche sur niveau(x) vers le bas
Ocean Loading in Brittany, Northwest France: Impact of the GPS Analysis Strategy / Joëlle Nicolas (2012)
Titre : Ocean Loading in Brittany, Northwest France: Impact of the GPS Analysis Strategy Type de document : Article/Communication Auteurs : Joëlle Nicolas, Auteur ; Stéphane Durand, Auteur ; Mathilde Vergnolle, Auteur ; Laurent Morel, Auteur ; Stavros A. Melachroinos, Auteur ; Marie-Noëlle Bouin , Auteur ; François Fund, Auteur Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2012 Collection : International Association of Geodesy Symposia, ISSN 0939-9585 num. 137 Conférence : IAG 2009, 7th Hotine-Marussi Symposium on Mathematical Geodesy 06/06/2009 10/06/2009 Rome Italie Proceedings Springer Importance : pp 367 - 372 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] analyse comparative
[Termes IGN] Bernese
[Termes IGN] GAMIT
[Termes IGN] GINS
[Termes IGN] GIPSY-OASIS
[Termes IGN] surcharge océaniqueRésumé : (auteur) In this contribution, we analyze the impact of different GPS processing strategies on ocean tide loading estimation. We use continuous GPS data acquired during a 4-month campaign performed in 2004 in Brittany, Northwest France. Since the expected geodynamical signal in the estimated positions is exceeding the typical GPS data analysis noise, this data set can be used to compare the results obtained with different analysis software packages. Moreover, in this specific case we need short sub-daily solutions to study short-period signals instead of classical 24 h-solutions. The GPS capability for measuring 3D ocean tide loading deformation has already been assessed, but since we are looking for the finest signal as the one induced by the shallow water constituents, it is essential to be sure that the position time series represent a geodynamical signal and are not biased by the data processing strategy used. To analyze the possible effect of the methodology used on the geodynamical results, we compare different solutions computed with different strategies (Double Differencing and Precise Point Positioning) with various GPS analysis software packages (Bernese, GAMIT, GINS, and GIPSY/OASIS). We show that the different solution consistency is at the level of 1–3 mm. We also show that the data processing strategy has a mean effect of about 10–20% of the ocean tide loading signal amplitude. Numéro de notice : C2009-001 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1007/978-3-642-22078-4_55 Date de publication en ligne : 18/10/2011 En ligne : https://doi.org/10.1007/978-3-642-22078-4_55 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102737 Strategies to mitigate aliasing of loading signals while estimating GPS frame parameters / Xavier Collilieux in Journal of geodesy, vol 86 n° 1 (January 2012)
[article]
Titre : Strategies to mitigate aliasing of loading signals while estimating GPS frame parameters Type de document : Article/Communication Auteurs : Xavier Collilieux , Auteur ; Tonie M. van Dam, Auteur ; Jim Ray, Auteur ; David Coulot , Auteur ; Laurent Métivier , Auteur ; Zuheir Altamimi , Auteur Année de publication : 2012 Projets : TOSCA / Article en page(s) : pp 1 - 14 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] crénelage
[Termes IGN] effet de charge
[Termes IGN] estimation statistique
[Termes IGN] géocentre
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] positionnement par GPSRésumé : (Auteur) Although GNSS techniques are theoretically sensitive to the Earth center of mass, it is often preferable to remove intrinsic origin and scale information from the estimated station positions since they are known to be affected by systematic errors. This is usually done by estimating the parameters of a linearized similarity transformation which relates the quasi-instantaneous frames to a long-term frame such as the International Terrestrial Reference Frame (ITRF). It is well known that non-linear station motions can partially alias into these parameters. We discuss in this paper some procedures that may allow reducing these aliasing effects in the case of the GPS techniques. The options include the use of well-distributed sub-networks for the frame transformation estimation, the use of site loading corrections, a modification of the stochastic model by downweighting heights, or the joint estimation of the low degrees of the deformation field. We confirm that the standard approach consisting of estimating the transformation over the whole network is particularly harmful for the loading signals if the network is not well distributed. Downweighting the height component, using a uniform sub-network, or estimating the deformation field perform similarly in drastically reducing the amplitude of the aliasing effect. The application of these methods to reprocessed GPS terrestrial frames permits an assessment of the level of agreement between GPS and our loading model, which is found to be about 1.5 mm WRMS in height and 0.8 mm WRMS in the horizontal at the annual frequency. Aliased loading signals are not the main source of discrepancies between loading displacement models and GPS position time series. Numéro de notice : A2012-117 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-011-0487-6 Date de publication en ligne : 08/11/2011 En ligne : https://doi.org/10.1007/s00190-011-0487-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31565
in Journal of geodesy > vol 86 n° 1 (January 2012) . - pp 1 - 14[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 266-2012011 RAB Revue Centre de documentation En réserve L003 Disponible Evidence for a slow subsidence of the Tahiti Island from GPS, DORIS, and combined satellite altimetry and tide gauge sea level records / Abdelali Fadil in Comptes rendus : Géoscience, vol 343 n° 5 (May 2011)
[article]
Titre : Evidence for a slow subsidence of the Tahiti Island from GPS, DORIS, and combined satellite altimetry and tide gauge sea level records Titre original : Indications d’une subsidence lente de l’île de Tahiti par analyse de données de positionnement GPS et DORIS, ainsi que par combinaison de données de suivi du niveau de la mer, d’altimétrie et de marégraphie Type de document : Article/Communication Auteurs : Abdelali Fadil, Auteur ; Lydie Sichoix, Auteur ; Jean-Pierre Barriot, Auteur ; Pascal Ortéga, Auteur ; Pascal Willis , Auteur Année de publication : 2011 Article en page(s) : pp 331 - 341 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] coordonnées GPS
[Termes IGN] déformation verticale de la croute terrestre
[Termes IGN] données altimétriques
[Termes IGN] données DORIS
[Termes IGN] données marégraphiques
[Termes IGN] montée du niveau de la mer
[Termes IGN] rebond post-glaciaire
[Termes IGN] récif corallien
[Termes IGN] subsidence
[Termes IGN] Tahiti
[Termes IGN] vitesseRésumé : (auteur) Monitoring vertical land motion is of crucial interest in observations of long-term sea level change and its reconstruction, but is among of the most, yet highly challenging, tasks of space geodesy. The aim of the paper is to compare the vertical velocity estimates of Tahiti Island obtained from five independent geophysical measurements, namely a decade of GPS and DORIS data, 17 years sea level difference (altimeter minus tide gauge (TG)) time series, ICE-5G (VM2 L90) Post-Glacial Rebound (PGR) model predictions, and coral reef stratigraphy. Except for the Glacial Isostatic Adjustment (GIA also known as PGR) model, all the techniques are in a good agreement and reveal a very slow subsidence of the Tahiti Island averaged at −0.5 mm/yr which is barely significant. Nevertheless, despite of that vertical motion, Tahiti remains an ideal location for the calibration of satellite altimeter measurements. Numéro de notice : A2011-602 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueNat DOI : 10.1016/j.crte.2011.02.002 Date de publication en ligne : 02/05/2011 En ligne : https://doi.org/10.1016/j.crte.2011.02.002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91676
in Comptes rendus : Géoscience > vol 343 n° 5 (May 2011) . - pp 331 - 341[article]Evaluation of the impact of atmospheric pressure loading modeling on GNSS data analysis / Rolf Dach in Journal of geodesy, vol 85 n° 2 (February 2011)
[article]
Titre : Evaluation of the impact of atmospheric pressure loading modeling on GNSS data analysis Type de document : Article/Communication Auteurs : Rolf Dach, Auteur ; Johannes Böhm , Auteur ; Simon Lutz, Auteur ; Peter Steigenberger, Auteur ; Gerhard Beutler, Auteur Année de publication : 2011 Article en page(s) : pp 75 - 91 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] analyse de données
[Termes IGN] données GNSS
[Termes IGN] impact sur les données
[Termes IGN] International GNSS Service
[Termes IGN] série temporelle
[Termes IGN] signal GNSS
[Termes IGN] surcharge atmosphérique
[Termes IGN] variation saisonnièreRésumé : (Auteur) In recent years, several studies have demonstrated the sensitivity of Global Navigation Satellite System (GNSS) station time series to displacements caused by atmospheric pressure loading (APL). Different methods to take the APL effect into account are used in these studies: applying the corrections from a geophysical model on weekly mean estimates of station coordinates, using observation-level corrections during data analysis, or solving for regression factors between the station displacement and the local pressure. The Center for Orbit Determination in Europe (CODE) is one of the global analysis centers of the International GNSS Service (IGS). The current quality of the IGS products urgently asks to consider this effect in the regular processing scheme. However, the resulting requirements for an APL model are demanding with respect to quality, latency, and—regarding the reprocessing activities—availability over a long time interval (at least from 1994 onward). The APL model of Petrov and Boy (J Geophys Res 109:B03405, 2004) is widely used within the VLBI community and is evaluated in this study with respect to these criteria. The reprocessing effort of CODE provides the basis for validating the APL model. The data set is used to solve for scaling factors for each station to evaluate the geophysical atmospheric non-tidal loading model. A consistent long-term validation of the model over 15 years, from 1994 to 2008, is thus possible. The time series of 15 years allows to study seasonal variations of the scaling factors using the dense GNSS tracking network of the IGS. By interpreting the scaling factors for the stations of the IGS network, the model by (2004) is shown to meet the expectations concerning the order of magnitude of the effect at individual stations within the uncertainty given by the GNSS data processing and within the limitations due to the model itself. The repeatability of station coordinates improves by 20% when applying the effect directly on the data analysis and by 10% when applying a post-processing correction to the resulting weekly coordinates compared with a solution without taking APL into account. Numéro de notice : A2011-067 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-010-0417-z Date de publication en ligne : 22/10/2010 En ligne : https://doi.org/10.1007/s00190-010-0417-z Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30848
in Journal of geodesy > vol 85 n° 2 (February 2011) . - pp 75 - 91[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 266-2011021 RAB Revue Centre de documentation En réserve L003 Disponible Towards development of a consistent orbit series for TOPEX, Jason-1, and Jason-2 / Franck G. Lemoine in Advances in space research, vol 46 n° 12 (15/12/2010)
[article]
Titre : Towards development of a consistent orbit series for TOPEX, Jason-1, and Jason-2 Type de document : Article/Communication Auteurs : Franck G. Lemoine, Auteur ; Nikita P. Zelensky, Auteur ; Douglas S. Chinn, Auteur ; Marek Ziebart, Auteur ; Despina E. Pavlis, Auteur ; David D. Rowlands, Auteur ; Brian D. Beckley, Auteur ; Scott B. Luthcke, Auteur ; Pascal Willis , Auteur ; et al., Auteur Année de publication : 2010 Article en page(s) : pp 1513 - 1540 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] cohérence des données
[Termes IGN] données altimétriques
[Termes IGN] données DORIS
[Termes IGN] force de gravitation
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] Jason
[Termes IGN] niveau moyen des mers
[Termes IGN] orbitographie
[Termes IGN] série temporelle
[Termes IGN] surcharge océanique
[Termes IGN] télémétrie laser sur satellite
[Termes IGN] TOPEX-PoseidonRésumé : (Auteur) The TOPEX/Poseidon, Jason-1 and Jason-2 set of altimeter data now provide a time series of synoptic observations of the ocean that span nearly 17 years from the launch of TOPEX in 1992. The analysis of the altimeter data including the use of altimetry to monitor the global change in mean sea level requires a stable, accurate, and consistent orbit reference over the entire time span. In this paper, we describe the recomputation of a time series of orbits that rely on a consistent set of reference frames and geophysical models. The recomputed orbits adhere to the IERS 2003 standards for ocean and earth tides, use updates to the ITRF2005 reference frame for both the SLR and DORIS stations, apply GRACE-derived models for modeling of the static and time-variable gravity, implement the University College London (UCL) radiation pressure model for Jason-1, use improved troposphere modeling for the DORIS data, and apply the GOT4.7 ocean tide model for both dynamical ocean tide modeling and for ocean loading. The new TOPEX orbits have a mean SLR fit of 1.79 cm compared to 2.21 cm for the MGDR-B orbits. These new TOPEX orbits agree radially with independent SLR/crossover orbits at 0.70 cm RMS, and the orbit accuracy is estimated at 1.5–2.0 cm RMS over the entire TOPEX time series. The recomputed Jason-1 orbits agree radially with the Jason-1 GDR-C orbits at 1.08 cm RMS. The GSFC SLR/DORIS dynamic and reduced-dynamic orbits for Jason-2 agree radially with independent orbits from the CNES and JPL at 0.70–1.06 cm RMS. Applying these new orbits, and using the latest altimeter corrections for TOPEX, Jason-1, and Jason-2 from September 1992 to May 2009, we find a global rate in mean sea level of 3.0 + 0.4 mm/yr. Numéro de notice : A2010-564 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2010.05.007 Date de publication en ligne : 13/05/2010 En ligne : https://doi.org/10.1016/j.asr.2010.05.007 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30756
in Advances in space research > vol 46 n° 12 (15/12/2010) . - pp 1513 - 1540[article]A crustal deformation study of the Charlevoix seismic zone in Quebec / Marc Cocard in Geomatica, vol 64 n° 3 (September 2010)PermalinkEstimation des déplacements causés par la surchage océanique dans l'ouest de la France à l'aide des réseaux GPS permanents / François Fund in XYZ, n° 124 (septembre - novembre 2010)PermalinkImproved constraints on models of glacial isostatic adjustment: A review of the contribution of ground-based geodetic observations / Matt A. King in Surveys in Geophysics, vol 31 n° 5 (September 2010)PermalinkCharacterizing long‐time scale hydrological effects on gravity for improved distinction of tectonic signals / Michel Van Camp in Journal of geophysical research : Solid Earth, Vol 115 n° B7 (July 2010)PermalinkTopographically induced height errors in predicted atmospheric loading effects / Tonie M. van Dam in Journal of geophysical research : Solid Earth, Vol 115 n° B7 (July 2010)PermalinkOcean loading effects on the prediction of Antarctic glacial isostatic uplift and gravity rates / K. Simon in Journal of geodesy, vol 84 n° 5 (May 2010)PermalinkImpact of loading effects on determination of the International Terrestrial Reference Frame / Xavier Collilieux in Advances in space research, vol 45 n° 1 ([04/01/2010])PermalinkUnderstanding sea-level rise and variability / J.A. Church (2010)PermalinkIsostatic stability of the East Antarctic station Dumont d'Urville from long-term geodetic observations and geophysical models / Martine Amalvict in Polar research, vol 28 n° 2 (August 2009)PermalinkObservations GPS et retards troposphériques : modélisations et application aux effets de surcharge océanique dans l’Ouest de la France / François Fund (2009)PermalinkPhysically consistent system model for the study of the Earth's rotation, surface deformation and gravity field parameters / A. Hense (2009)PermalinkAssessing the accuracy of predicted ocean tide loading displacement values / Nigel Penna in Journal of geodesy, vol 82 n° 12 (December 2008)PermalinkThe gravitational effect of ocean tide loading at high latitude coastal stations in Norway / D.I. Lysaker in Journal of geodesy, vol 82 n° 9 (September 2008)PermalinkMulti-technique monitoring of ocean tide loading in Northern France / Muriel Llubes in Comptes rendus : Géoscience, vol 340 n° 6 (June 2010)PermalinkOcean tide loading (OTL) displacements from global and local grids: comparisons to GPS estimates over the shelf of Brittany, France / Stavros A. Melachroinos in Journal of geodesy, vol 82 n° 6 (June 2008)PermalinkGPS estimates of ocean tide loading in NW-France: Determination of ocean tide loading constituents and comparison with a recent ocean tide model / Mathilde Vergnolle in Geophysical journal international, vol 173 n° 2 (May 2008)PermalinkQuasigeoid evaluation with improved levelled height data for Norway / D.I. Lysaker in Journal of geodesy, vol 81 n° 9 (September 2007)PermalinkA comparison of GPS, VLBI and model estimates of ocean tide loading displacements / I.D. Thomas in Journal of geodesy, vol 81 n° 5 (May 2007)PermalinkDetermination of the free core nutation period from tidal gravity observations of the GGP superconducting gravimeter network / B. Ducarme in Journal of geodesy, vol 81 n° 3 (March 2007)PermalinkPositionnement géodésique à haute fréquence de réseaux GNSS terrestres et marins / Stavros A. Melachroinos (2007)PermalinkDetermination of postglacial land uplift in Fennoscandia from leveling, tide-gauges and continuous GPS stations using least squares collocation / O. Vestol in Journal of geodesy, vol 80 n° 5 (August 2006)PermalinkMesure de la déformation de l'écorce terrestre par géodésie spatiale [diaporama] / Jérome Verdun (2006)PermalinkWorld-wide synthetic tide parameters for gravity and vertical and horizontal displacements / K.H. Zahran in Journal of geodesy, vol 79 n° 6-7 (September - October 2005)PermalinkTectonique des plaques et rebond post-glaciaire / Juliette Legrand (2003)PermalinkÉtude de la flexion continentale sous la charge océanique à partir des données RGP / Marie-Noëlle Bouin in Bulletin d'information de l'Institut géographique national, n° 73 (septembre 2002)PermalinkEinfluß von Auflasteffekten auf präzise GPS-Messungen / Rolf Dach (2000)PermalinkPermalinkPermalinkPermalinkUntersuchungen zu Erddeformationsmodellen für die Auswertung von geodätischen VLBI-Messungen / Rüdiger Haas (1996)PermalinkSpace geodesy techniques / R.T.K. Jaldehag (1995)PermalinkAtmospheric pressure loading effects on global positioning system coordinate determinations / Tonie M. VanDam in Journal of geophysical research : Solid Earth, vol 99 n° 12 (10/12/1994)PermalinkDetection of atmospheric pressure loading using very long baseline interferometry measurements / Tonie M. VanDam in Journal of geophysical research : Solid Earth, vol 99 n° 3 (10/03/1994)PermalinkGeodesy and geophysics / J. Kakkuri (1993)PermalinkA parametrized solid Earth tide model and ocean tide loading effects for global geodetic baseline measurements / H. Scherneck in Geophysical journal international, vol 106 n° 3 (September 1991)PermalinkEarth rotation : theory and observation / Helmut Moritz (1988)PermalinkMethods of tidal loading computation / Trevor Baker in Bulletin international des marées terrestres, n° 94 (juin 1985)Permalink