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Relationship and transformation between the International and the European Terrestrial Reference Systems / Zuheir Altamimi (2017)
Titre : Relationship and transformation between the International and the European Terrestrial Reference Systems Type de document : Rapport Auteurs : Zuheir Altamimi , Auteur Editeur : [s.l.] : [s.n.] Année de publication : 2017 Collection : EUREF Technical Notes num. 1 Importance : 12 p. Format : 30 x 21 cm Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] European Terrestrial Reference Frame
[Termes IGN] European Terrestrial Reference System 1989
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] International Terrestrial Reference SystemRésumé : (auteur) [introduction] The European Terrestrial Reference System 89 (ETRS89) was adopted in 1990 in Firenze,Italy, following the EUREF Resolution 1 that states: "The IAG Subcommision for the Euro-pean Reference Frame recommends that the system to be adopted by EUREF will be coinci-dent with the ITRS at the epoch 1989.0 and fixed to the stable part of the Eurasian Plate andwill be known as European Terrestrial Reference System 89 (ETRS89)".Following this resolution, a detailed description of ETRS89 and its relationship with theInternational Terrestrial Reference System (ITRS), including transformation formula werepublished in Boucher and Altamimi (1992).The purpose of this Technical Note is to (1) recall the mathematical relationship link-ing ETRS89 to the ITRS, (2) provide the users with all the necessary information allowingto transform station positions and velocities from any ITRSrealization to any ETRS89 re-alization, designated hereafter by ITRFyyand ETRFyy, respectively, and (3) recommend aprocedure to follow when realizing the ETRS89 at the national or regional level using GNSSdata and the International GNSS Service (IGS) products. This Technical Note summarizesand replaces the old memo of Boucher and Altamimi that was first published in September20, 1993 and last updated in May 18, 2011. Numéro de notice : 17570 Affiliation des auteurs : LASTIG LAREG (2012-mi2018) Thématique : POSITIONNEMENT Nature : Rapport d'étude technique nature-HAL : RappRech DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91959 Documents numériques
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Titre de série : Springer Handbook of Global Navigation Satellite Systems, ch. 36 Titre : Geodesy Type de document : Chapitre/Contribution Auteurs : Zuheir Altamimi , Auteur ; Richard S. Gross, Auteur Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2017 Importance : pp 1039 - 1061 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] coordonnées GNSS
[Termes IGN] Global Geodetic Observing System
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] International Terrestrial Reference SystemRésumé : (auteur) Continuous geodetic observations are fundamental to characterize changes in space and time that affect the Earth system. The advent of global navigation satellite systems (GNSS s), starting with the Global Positioning System (GPS ) in the early 1980s, has significantly increased the range of geodetic applications and their precision. Significant improvements have progressively been made in the GNSS software packages developed by research institutes, leading to the determination of high-precision geodetic parameters and their temporal variations. The proliferation of dense GNSS networks (local, national, continental and global), composed of continuously observing stations, allows for a variety of geodetic and Earth science applications. Most areas of science, Earth observation, georeferencing applications, and society at large, today depend on being able to determine positions to millimeter-level precision. Point positions, to be meaningful and fully exploitable, have to be determined and expressed in a well-defined reference frame. All current global and regional reference frames rely on the availability of the international terrestrial reference frame (ITRF ), which is the most accurate realization of the international terrestrial reference system (ITRS ). One of the major modern achievements in geodesy today is the ability to determine highly precise global and regional terrestrial reference frames based on GNSS observations, fully connected to the ITRF. This chapter describes the use and applications of GNSS in geodesy, focusing on its role in the International Association of Geodesy’s (IAG’s) global geodetic observing system (GGOS) for monitoring our planet in space and time, GNSS-based reference frame implementation, Earth rotation and sea level monitoring. Numéro de notice : H2017-028 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Chapître / contribution nature-HAL : ChOuvrScient DOI : 10.1007/978-3-319-42928-1_36 En ligne : https://doi.org/10.1007/978-3-319-42928-1_36 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91918 Study of trends and variability of atmospheric water vapour with climate models and observations from global GNSS network / Ana-Claudia Bernardes Parracho (2017)
Titre : Study of trends and variability of atmospheric water vapour with climate models and observations from global GNSS network Type de document : Thèse/HDR Auteurs : Ana-Claudia Bernardes Parracho , Auteur ; Sophie Bastin, Directeur de thèse ; Olivier Bock , Directeur de thèse Editeur : Paris : Université de Paris 6 Pierre et Marie Curie Année de publication : 2017 Importance : 147 p. Format : 21 x 30 cm Note générale : bibliographie
Thèse de Doctorat de Sciences de l’EnvironnementLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] analyse diachronique
[Termes IGN] données GPS
[Termes IGN] données météorologiques
[Termes IGN] humidité de l'air
[Termes IGN] modèle atmosphérique
[Termes IGN] précipitation
[Termes IGN] série temporelle
[Termes IGN] teneur intégrée en vapeur d'eau
[Termes IGN] variabilitéIndex. décimale : THESE Thèses et HDR Résumé : (auteur) Water vapour is a key component of the Earth’s climate system, and its distribution and variability are sources of uncertainty in climate models. The use of long-term integrated water vapour (IWV) observations and reanalyses can help in their assessment. This work pioneered the use of reprocessed GPS IWV data for 1995-2010, converted from estimates of Zenith Total Delay. The conversion was assessed, with the goal of producing a high quality long-term IWV data set. Due to uncertainties in the GPS observations and homogeneity concerns, a global comparison with ERA-Interim reanalysis data was made. Although a general good agreement in means, variability and trends was found, issues in both data sets were highlighted. In GPS, gaps and inhomogeneities in the time series were evidenced, as well as representativeness differences in coastal areas and regions of complex topography. In ERA-Interim, too strong trends in certain regions were found. ERA-Interim was also compared with other reanalyses (MERRA-2, ERA-20C, 20CR), and differences were found in the IWV trends over Africa, Australia, and Antarctica. Finally, GPS and ERA-Interim IWV were used to assess four configurations of the LMDZ atmospheric general circulation model with two different physics and with or without nudging towards ERA-Interim wind fields. Impact of the model physics on the IWV mean was found, with the new physics being moister at tropical latitudes. Overall, the model free runs in both physics have difficulty reproducing the trends and variability observed in ERA-Interim and GPS. This is improved with the nudging, which confirms the importance of large-scale dynamics on IWV trends and variability. Note de contenu : 1- Introduction
2- Elaboration of a reference long-term IWV dataset from ground-based GNSS measurements
3- Observation of IWV trends and variability from GPS data and reanalyses
4- Assessment of simulations from global climate models using GPS data and atmospheric reanalyses
5- Conclusions and perspectivesNuméro de notice : 25862 Affiliation des auteurs : LASTIG LAREG (2012-mi2018) Thématique : POSITIONNEMENT Nature : Thèse française Note de thèse : Thèse de Doctorat : Sciences de l’Environnement : Paris : 2017 Organisme de stage : LAREG (IGN) & LATMOS nature-HAL : Thèse DOI : sans En ligne : https://tel.hal.science/tel-01881083 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95505