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Auteur Zuheir Altamimi
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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 Assessment of the accuracy of global geodetic satellite laser ranging observations and estimated impact on ITRF scale: estimation of systematic errors in LAGEOS observations 1993–2014 / Graham Appleby in Journal of geodesy, vol 90 n° 12 (December 2016)
[article]
Titre : Assessment of the accuracy of global geodetic satellite laser ranging observations and estimated impact on ITRF scale: estimation of systematic errors in LAGEOS observations 1993–2014 Type de document : Article/Communication Auteurs : Graham Appleby, Auteur ; José Rodríguez, Auteur ; Zuheir Altamimi , Auteur Année de publication : 2016 Article en page(s) : pp 1371 - 1388 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] analyse diachronique
[Termes IGN] champ de gravitation
[Termes IGN] constante
[Termes IGN] données Lageos
[Termes IGN] données TLS (télémétrie)
[Termes IGN] erreur systématique
[Termes IGN] géocentre
[Termes IGN] système de référence géodésiqueRésumé : (Auteur) Satellite laser ranging (SLR) to the geodetic satellites LAGEOS and LAGEOS-2 uniquely determines the origin of the terrestrial reference frame and, jointly with very long baseline interferometry, its scale. Given such a fundamental role in satellite geodesy, it is crucial that any systematic errors in either technique are at an absolute minimum as efforts continue to realise the reference frame at millimetre levels of accuracy to meet the present and future science requirements. Here, we examine the intrinsic accuracy of SLR measurements made by tracking stations of the International Laser Ranging Service using normal point observations of the two LAGEOS satellites in the period 1993 to 2014. The approach we investigate in this paper is to compute weekly reference frame solutions solving for satellite initial state vectors, station coordinates and daily Earth orientation parameters, estimating along with these weekly average range errors for each and every one of the observing stations. Potential issues in any of the large number of SLR stations assumed to have been free of error in previous realisations of the ITRF may have been absorbed in the reference frame, primarily in station height. Likewise, systematic range errors estimated against a fixed frame that may itself suffer from accuracy issues will absorb network-wide problems into station-specific results. Our results suggest that in the past two decades, the scale of the ITRF derived from the SLR technique has been close to 0.7 ppb too small, due to systematic errors either or both in the range measurements and their treatment. We discuss these results in the context of preparations for ITRF2014 and additionally consider the impact of this work on the currently adopted value of the geocentric gravitational constant, GM. Numéro de notice : A2016-808 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-016-0929-2 Date de publication en ligne : 29/06/2016 En ligne : http://dx.doi.org/10.1007/s00190-016-0929-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82596
in Journal of geodesy > vol 90 n° 12 (December 2016) . - pp 1371 - 1388[article]ITRF2014: A new release of the International Terrestrial Reference Frame modeling nonlinear station motions / Zuheir Altamimi in Journal of geophysical research : Solid Earth, vol 121 n° 8 (August 2016)
[article]
Titre : ITRF2014: A new release of the International Terrestrial Reference Frame modeling nonlinear station motions Type de document : Article/Communication Auteurs : Zuheir Altamimi , Auteur ; Paul Rebischung , Auteur ; Laurent Métivier , Auteur ; Xavier Collilieux , Auteur Année de publication : 2016 Article en page(s) : pp 6109 - 6131 Note générale : bibliographie Langues : Anglais (eng) Résumé : (auteur) For the first time in the International Terrestrial Reference Frame (ITRF) history, the ITRF2014 is generated with an enhanced modeling of nonlinear station motions, including seasonal (annual and semiannual) signals of station positions and postseismic deformation for sites that were subject to major earthquakes. Using the full observation history of the four space geodetic techniques (very long baseline interferometry (VLBI), satellite laser ranging (SLR), Global Navigation Satellite Systems (GNSS), and Doppler orbitography and radiopositioning integrated by satellite (DORIS)), the corresponding international services provided reprocessed time series (weekly from SLR and DORIS, daily from GNSS, and 24 h session‐wise from VLBI) of station positions and daily Earth Orientation Parameters. ITRF2014 is demonstrated to be superior to past ITRF releases, as it precisely models the actual station trajectories leading to a more robust secular frame and site velocities. The ITRF2014 long‐term origin coincides with the Earth system center of mass as sensed by SLR observations collected on the two LAGEOS satellites over the time span between 1993.0 and 2015.0. The estimated accuracy of the ITRF2014 origin, as reflected by the level of agreement with the ITRF2008 (both origins are defined by SLR), is at the level of less than 3 mm at epoch 2010.0 and less than 0.2 mm/yr in time evolution. The ITRF2014 scale is defined by the arithmetic average of the implicit scales of SLR and VLBI solutions as obtained by the stacking of their respective time series. The resulting scale and scale rate differences between the two solutions are 1.37 (±0.10) ppb at epoch 2010.0 and 0.02 (±0.02) ppb/yr. While the postseismic deformation models were estimated using GNSS/GPS data, the resulting parametric models at earthquake colocation sites were applied to the station position time series of the three other techniques, showing a very high level of consistency which enforces more the link between techniques within the ITRF2014 frame. The users should be aware that the postseismic deformation models are part of the ITRF2014 products, unlike the annual and semiannual signals, which were estimated internally with the only purpose of enhancing the velocity field estimation of the secular frame. Numéro de notice : A2016--172 Affiliation des auteurs : LASTIG LAREG (2012-mi2018) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1002/2016JB013098 Date de publication en ligne : 18/07/2016 En ligne : https://doi.org/10.1002/2016JB013098 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90913
in Journal of geophysical research : Solid Earth > vol 121 n° 8 (August 2016) . - pp 6109 - 6131[article]Documents numériques
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ITRF2014: A new release ... - pdf éditeurAdobe Acrobat PDF
[article]
Titre : The IGS contribution to ITRF2014 Type de document : Article/Communication Auteurs : Paul Rebischung , Auteur ; Zuheir Altamimi , Auteur ; Jim Ray, Auteur ; Bruno Garayt , Auteur Année de publication : 2016 Article en page(s) : pp 611 – 630 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] données GNSS
[Termes IGN] estimation de précision
[Termes IGN] géocentre
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] réseau géodésique terrestreRésumé : (auteur) Following the first reprocessing campaign performed by the International GNSS Service (IGS) in 2008, a second reprocessing campaign (repro2) was finalized in 2015. Nine different Analysis Centers (ACs) reanalyzed the history of GNSS data collected by a global tracking network back to 1994 using the latest available models and methodology, and provided daily terrestrial frame solutions among other products. Daily combinations of the AC terrestrial frame solutions provided the IGS input to the next release of the International Terrestrial Reference Frame (ITRF2014). From weighted root mean squares values of the residuals of the daily repro2 combinations, the overall inter-AC level of agreement is assessed to be 1.5 mm for the horizontal components and 4 mm for the vertical component of station positions, 25–40 μas for pole coordinates, 140–200 μas/day for pole rates, 8–20 μs/day for calibrated length-of-day estimates, 4 mm for the X and Y components of geocenter motion, 8 mm for its Z component and 0.5 mm for the terrestrial scale. On the long term, the origins (resp. scales) of the AC terrestrial frames show relative offsets and rates within ±3 mm and ±0.3 mm/year (resp. ±0.5 mm and ±0.05 mm/year). The combination residuals also present AC-specific features, some of which are explained by known analysis specifics, while others remain under investigation. Numéro de notice : A2016-425 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-016-0897-6 Date de publication en ligne : 08/04/2016 En ligne : http://dx.doi.org/10.1007/s00190-016-0897-6 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81319
in Journal of geodesy > vol 90 n° 7 (July 2016) . - pp 611 – 630[article]Combination of GNSS and SLR measurements : contribution to the realization of the terrestrial reference frame / Sara Bruni (2016)PermalinkPermalinkIGS International GNSS Service technical report 2015. IGS Reference frame working group coordinator report 2015 / Paul Rebischung (2016)PermalinkQuality evaluation of the weekly vertical loading effects induced from continental water storage models / Z. Li (2016)PermalinkVers la prise en compte de la dépendance spatio temporelle des séries de position GNSS dans leur analyse / Clément Benoist (2016)PermalinkContribution de l'Institut National de l'Information Géographique et Forestière à la réalisation du repère de référence terrestre de GALILEO / Jonathan Chenal in XYZ, n° 143 (juin - août 2015)PermalinkKALREF, a Kalman filter and time series approach to the International Terrestrial Reference Frame realization / Xiaoping Wu in Journal of geophysical research : Solid Earth, vol 120 n° 5 (May 2015)PermalinkThree-Corner Hat for the assessment of the uncertainty of non-linear residuals of space-geodetic time series in the context of terrestrial reference frame analysis / Claudio Abbondanza in Journal of geodesy, vol 89 n° 4 (April 2015)PermalinkPermalinkIERS annual report 2014, ch. 3.6.2. ITRS Combination Centre : Institut National de l‘Information Géographique et Forestière (IGN) / Zuheir Altamimi (2015)PermalinkIGS International GNSS Service technical report 2014. IGS Reference Frame Working Group Coordinator Report 2014 / Paul Rebischung (2015)PermalinkPermalinkGlobal coseismic deformations, GNSS time series analysis, and earthquake scaling laws / Laurent Métivier in Journal of geophysical research : Solid Earth, vol 119 n° 12 (December 2014)PermalinkPermalinkA collinearity diagnosis of the GNSS geocenter determination / Paul Rebischung in Journal of geodesy, vol 88 n° 1 (January 2014)PermalinkEUREF’s contribution to national, European and global geodetic infrastructures / Johannes Ihde (2014)PermalinkExternal evaluation of the Terrestrial Reference Frame: report of the task force of the IAG sub-commission 1.2 / Xavier Collilieux (2014)PermalinkPermalinkIERS annual report 2012, ch. 3.6.2. ITRS Combination Centre : Institut National de l‘Information Géographique et Forestière (IGN) / Zuheir Altamimi (2014)PermalinkPermalink
HDR in 2006
IAG Vice-President