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Secular changes in Earth’s shape and surface mass loading derived from combinations of reprocessed global GPS networks / david Booker in Journal of geodesy, vol 88 n° 9 (September 2014)  

Public [article]  inJournal of geodesy > vol 88 n° 9 (September 2014) . - pp 839 - 855 Titre : Secular changes in Earth’s shape and surface mass loading derived from combinations of reprocessed global GPS networks Type de document : Article/Communication Auteurs : david Booker, Auteur ; Peter J. Clarke, Auteur ; David Lavallée, Auteur Année de publication : 2014 Article en page(s) : pp 839 - 855 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] croute terrestre [Termes IGN] détection de changement [Termes IGN] masse d'eau [Termes IGN] masse de la Terre [Termes IGN] traitement de données GNSS Résumé : (Auteur) The changing distribution of surface mass (oceans, atmospheric pressure, continental water storage, groundwater, lakes, snow and ice) causes detectable changes in the shape of the solid Earth, on time scales ranging from hours to millennia. Transient changes in the Earth’s shape can, regardless of cause, be readily separated from steady secular variation in surface mass loading, but other secular changes due to plate tectonics and glacial isostatic adjustment (GIA) cannot. We estimate secular station velocities from almost 11 years of high quality combined GPS position solutions (GPS weeks 1,000–1,570) submitted as part of the first international global navigation satellite system service reprocessing campaign. Individual station velocities are estimated as a linear fit, paying careful attention to outliers and offsets. We remove a suite of a priori GIA models, each with an associated set of plate tectonic Euler vectors estimated by us; the latter are shown to be insensitive to the a priori GIA model. From the coordinate time series residuals after removing the GIA models and corresponding plate tectonic velocities, we use mass-conserving continental basis functions to estimate surface mass loading including the secular term. The different GIA models lead to significant differences in the estimates of loading in selected regions. Although our loading estimates are broadly comparable with independent estimates from other satellite missions, their range highlights the need for better, more robust GIA models that incorporate 3D Earth structure and accurately represent 3D surface displacements. Numéro de notice : A2014-455 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-014-0725-9 Date de publication en ligne : 06/05/2014 En ligne : https://doi.org/10.1007/s00190-014-0725-9 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74027 [article]

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266-2014091	SL	Revue	Centre de documentation	Revues en salle	Disponible

An enhanced strategy for GNSS data processing of massive networks / H. Chen in Journal of geodesy, vol 88 n° 9 (September 2014)  

Public [article]  inJournal of geodesy > vol 88 n° 9 (September 2014) . - pp 857-867 Titre : An enhanced strategy for GNSS data processing of massive networks Type de document : Article/Communication Auteurs : H. Chen, Auteur ; W. Jiang, Auteur ; Maorong Ge, Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 857-867 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] longueur d'onde [Termes IGN] phase GNSS [Termes IGN] positionnement ponctuel précis [Termes IGN] résolution d'ambiguïté Résumé : (Auteur)Although the computational burden of global navigation satellite systems (GNSS) data processing is nowadays already a big challenge, especially for huge networks, integrated processing of denser networks with data of multi-GNSS and multi-frequency is desired in the expectation of more accurate and reliable products. Based on the concept of carrier range, in this study, the precise point positioning with integer ambiguity resolution is engaged to obtain the integer ambiguities for converting carrier phases to carrier ranges. With such carrier ranges and pseudo-ranges, rigorous integrated processing is realized computational efficiently for the orbit and clock estimation using massive networks. The strategy is validated in terms of computational efficiency and product quality using data of the IGS network with about 460 stations. The experimental validation shows that the computation time of the new strategy increases gradually with the number of stations. It takes about 14 min for precise orbit and clock determination with 460 stations, while the current strategy needs about 82 min. The overlapping orbit RMS is reduced from 27.6 mm with 100 stations to 24.8 mm using the proposed strategy, and the RMS could be further reduced to 23.2 mm by including all 460 stations. Therefore, the new strategy could be applied to massive networks of multi-GNSS and multi-frequency receivers and possibly to achieve GNSS data products of higher quality. Numéro de notice : A2013-546 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-014-0727-7 Date de publication en ligne : 05/06/2014 En ligne : https://doi.org/10.1007/s00190-014-0727-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74028 [article]

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Rescue of the historical sea level record of Marseille (France) from 1885 to 1988 and its extension back to 1849–1851 / Guy Wöppelmann in Journal of geodesy, vol 88 n° 9 (September 2014)    

Public [article]  inJournal of geodesy > vol 88 n° 9 (September 2014) . - pp 869 - 885 Titre : Rescue of the historical sea level record of Marseille (France) from 1885 to 1988 and its extension back to 1849–1851 Type de document : Article/Communication Auteurs : Guy Wöppelmann , Auteur ; Marta Marcos, Auteur ; Alain Coulomb , Auteur ; Bélen Martín Míguez, Auteur ; Paul Bonnetain, Auteur ; Claude Boucher , Auteur ; Médéric Gravelle, Auteur ; Bernard Simon, Auteur ; Pascal Tiphaneau, Auteur Année de publication : 2014 Article en page(s) : pp 869 - 885 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] dix-neuvième siècle [Termes IGN] histoire des sciences et techniques [Termes IGN] marégraphe [Termes IGN] marégraphie [Termes IGN] Marseille [Termes IGN] niveau moyen des mers Résumé : (Auteur) This paper describes the historical sea level data that we have rescued from a tide gauge, especially devised originally for geodesy. This gauge was installed in Marseille in 1884 with the primary objective of defining the origin of the height system in France. Hourly values for 1885–1988 have been digitized from the original tidal charts. They are supplemented by hourly values from an older tide gauge record (1849–1851) that was rediscovered during a survey in 2009. Both recovered data sets have been critically edited for errors and their reliability assessed. The hourly values are thoroughly analysed for the first time after their original recording. A consistent high-frequency time series is reported, increasing notably the length of one of the few European sea level records in the Mediterranean Sea spanning more than one hundred years. Changes in sea levels are examined, and previous results revisited with the extended time series. The rate of relative sea level change for the period 1849–2012 is estimated to have been 1.08±0.04 mm/year at Marseille, a value that is slightly lower but in close agreement with the longest time series of Brest over the common period ( 1.26±0.04 mm/year). The data from a permanent global positioning system station installed on the roof of the solid tide gauge building suggests a remarkable stability of the ground ( −0.04±0.25 mm/year) since 1998, confirming the choice made by our predecessor geodesists in the nineteenth century regarding this site selection. Numéro de notice : A2014-457 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-014-0728-6 Date de publication en ligne : 08/06/2014 En ligne : https://doi.org/10.1007/s00190-014-0728-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74029 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
266-2014091	SL	Revue	Centre de documentation	Revues en salle	Disponible

Documents numériques

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Empirical modelling of site-specific errors in continuous GPS data / Michael Moore in Journal of geodesy, vol 88 n° 9 (September 2014)  

Public [article]  inJournal of geodesy > vol 88 n° 9 (September 2014) . - pp 887-900 Titre : Empirical modelling of site-specific errors in continuous GPS data Type de document : Article/Communication Auteurs : Michael Moore, Auteur ; Christopher S. Watson, Auteur ; Matt A. King, Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 887-900 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] données GPS [Termes IGN] erreur de positionnement [Termes IGN] modélisation [Termes IGN] phase GPS Résumé : (Auteur) Continuous global positioning system (GPS) stations propagate biases and spurious signals into the derived parameter time series when the measurements are subject to site-specific effects, such as multipath. This is a particular problem in the investigation of geophysical and atmospheric phenomena where signals may be small in magnitude. A methodology to remove these erroneous signals from long-term time series will significantly increase the usefulness of the derived time series. This work provides the theoretical basis for use of an empirical site model (ESM) derived from post-fit phase residuals to mitigate unmodelled site-specific errors. Additionally, we also investigate the effectiveness of applying an ESM to a regional GPS network and a short baseline solution. Under most observing scenarios, we show that the ESM approach is predicted to improve the precision and accuracy of the site coordinates. However, it is important to note that we found some scenarios where the ESM can introduce a bias. For instance, when the antenna is mounted close to the ground. In this scenario, for a short baseline, we observed the introduction of a 4-mm bias in height. Use of an ESM for the same short baseline with an uncalibrated radome substantially improves the results by removing a large bias of over 10 mm in height. Similarly, application of an ESM derived from historic data yields similar improvements. This demonstrates that the ESM can be a powerful tool when applied to appropriate site-specific configurations and could potentially be implemented in routine GPS analysis for a broad range of applications. Numéro de notice : A2014-458 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-014-0729-5 Date de publication en ligne : 03/06/2014 En ligne : https://doi.org/10.1007/s00190-014-0729-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74030 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
266-2014091	SL	Revue	Centre de documentation	Revues en salle	Disponible