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Termes IGN > sciences naturelles > sciences de la Terre et de l'univers > géosciences > géophysique interne > géodésie > réseau géodésique > réseau géodésique terrestre > International Terrestrial Reference Frame
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Topographically 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)
[article]
Titre : Topographically induced height errors in predicted atmospheric loading effects Type de document : Article/Communication Auteurs : Tonie M. van Dam, Auteur ; Zuheir Altamimi , Auteur ; Xavier Collilieux , Auteur ; Jim Ray, Auteur Année de publication : 2010 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] déformation verticale de la croute terrestre
[Termes IGN] hauteur ellipsoïdale
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] positionnement par GPS
[Termes IGN] pression atmosphérique
[Termes IGN] résidu
[Termes IGN] série temporelle
[Termes IGN] surcharge atmosphériqueRésumé : (auteur) Atmospheric pressure variations are known to induce vertical displacements of the Earth's surface with magnitudes large enough to be detected by geodetic observations. Estimates of these loading effects are derived using global reanalysis fields of surface pressure as input. The input surface pressure has a minimum spatial sampling, which does not capture true surface pressure variations due to high topographic variability in some regions. In this paper, we investigate the effect that unmodeled topographic variability has on surface pressure estimates and subsequent estimates of vertical surface displacements. We find that the estimated height changes from the topographic surface pressure can be significant (2–4 mm) for sites in regions of high topographic variability. When we compare the estimated height changes to Global Positioning System residuals from the 2005 International Terrestrial Reference Frame Realization, we find that the heights derived from the topographic surface pressure, versus those from the normal surface pressure, perform better at reducing the scatter on the height coordinate time series. Numéro de notice : A2010-657 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1029/2009JB006810 Date de publication en ligne : 29/07/2010 En ligne : https://doi.org/10.1029/2009JB006810 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91744
in Journal of geophysical research : Solid Earth > Vol 115 n° B7 (July 2010)[article]Voir aussiDocuments numériques
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Topographically induced height errors ... - pdf éditeurAdobe Acrobat PDF Contributions of the French Institut Géographique National (IGN) to the International DORIS Service / Pascal Willis in Advances in space research, vol 45 n° 12 (15/06/2010)
[article]
Titre : Contributions of the French Institut Géographique National (IGN) to the International DORIS Service Type de document : Article/Communication Auteurs : Pascal Willis , Auteur ; Claude Boucher , Auteur ; Hervé Fagard, Auteur ; Bruno Garayt , Auteur ; Marie-Line Gobinddass , Auteur Année de publication : 2010 Article en page(s) : pp 1470 - 1480 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] données DORIS
[Termes IGN] International DORIS Service
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] mouvement du pôle
[Termes IGN] positionnement par DORIS
[Termes IGN] réseau DorisRésumé : (Auteur) DORIS is one of the four geodetic space techniques participating to the Global Geodetic Observing System (GGOS). Since the early development of this system, the Institut Géographique National played a specific and active role. Within, the International DORIS Service (IDS), IGN is in a particular position. While it is responsible for the installation and the maintenance of the DORIS ground tracking stations, it also handles one of the two IDS data center delivering DORIS data and products and has been an IDS Analysis Center for years, providing all possible IDS products, in particular the latest ignwd08 time series in preparation of ITRF2008. This paper explains the different aspects of the IGN contribution to IDS from an historical point of view, presents current activities and scientific results and provides a perspective for future activities. Recent DORIS results show a 10 mm precision or better when more than four DORIS satellites are available. Comparisons between recent DORIS solutions (ign07d02 and ign09d02) and past ITRF realizations show that errors are shared between the DORIS and the ITRF realizations. Some problems related to DORIS data processing are also discussed and possible ways to solve them in the future are discussed. In particular, we can now reject the tropospheric origin of the problem detected in the Envisat data after the software upload of October 12, 2004. A few applications in geodesy (terrestrial reference frame, Earth's polar motion) and geophysics are also discussed as a natural extension of these service-type activities. Numéro de notice : A2010-361 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2009.09.019 Date de publication en ligne : 02/10/2009 En ligne : https://doi.org/10.1016/j.asr.2009.09.019 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30555
in Advances in space research > vol 45 n° 12 (15/06/2010) . - pp 1470 - 1480[article]GSFC DORIS contribution to ITRF2008 / Karine Le Bail in Advances in space research, vol 45 n° 12 (15/06/2010)
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Titre : GSFC DORIS contribution to ITRF2008 Type de document : Article/Communication Auteurs : Karine Le Bail , Auteur ; Franck G. Lemoine, Auteur ; Douglas S. Chinn, Auteur Année de publication : 2010 Article en page(s) : pp 1481 - 1499 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] données DORIS
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] orbitographie
[Termes IGN] orientation de la TerreRésumé : (Auteur) The NASA GSFC DORIS analysis center has provided weekly DORIS solutions from November 1992 to January 2009 (839 SINEX files) of station positions and Earth Orientation Parameters for inclusion in the DORIS contribution to ITRF2008. The NASA GSFC GEODYN orbit determination software was used to process the orbits and produce the normal equations. The weekly SINEX gscwd10 submissions included DORIS data from Envisat, TOPEX/Poseidon, SPOT-2, SPOT-3, SPOT-4, SPOT-5. The orbits were mostly seven days in length (except for weeks with data gaps or maneuvers). The processing used the GRACE-derived EIGEN-GL04S1 gravity model, updated modeling for time-variable gravity, the GOT4.7 ocean tide model and tuned satellite-specific macromodels for SPOT-2, SPOT-3, SPOT-4, SPOT-5 and TOPEX/Poseidon. The University College London (UCL) radiation pressure model for Envisat improves nonconservative force modeling for this satellite, reducing the median residual empirical daily along-track accelerations from 3.75 * 10-9 m/s2 with the a priori macromodel to 0.99 * 10-9 m/s2 with the UCL model. For the SPOT and Envisat DORIS satellite orbits from 2003 to 2008, we obtain average RMS overlaps of 0.8–0.9 cm in the radial direction, 2.1–3.4 cm cross-track, and 1.7–2.3 cm along-track. The RMS orbit differences between Envisat DORIS-only and SLR & DORIS orbits are 1.1 cm radially, 6.4 cm along-track and 3.7 cm cross-track and are characterized by systematic along-track mean offsets due to the Envisat DORIS system time bias of 15–10 ?s. We obtain a good agreement between the geometrically-determined geocenter parameters and geocenter parameters determined dynamically from analysis of the degree one terms of the geopotential. The intrinsic RMS weekly position repeatability with respect to the IDS-3 combination ranges from 2.5 to 3.0 cm in 1993–1994 to 1.5 cm in 2007–2008. Numéro de notice : A2010-362 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2010.01.030 En ligne : http://dx.doi.org/doi/10.1016/j.asr.2010.01.030 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30556
in Advances in space research > vol 45 n° 12 (15/06/2010) . - pp 1481 - 1499[article]Quality assessment of the IDS contribution to ITRF2008 / Zuheir Altamimi in Advances in space research, vol 45 n° 12 (15/06/2010)
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Titre : Quality assessment of the IDS contribution to ITRF2008 Type de document : Article/Communication Auteurs : Zuheir Altamimi , Auteur ; Xavier Collilieux , Auteur Année de publication : 2010 Article en page(s) : pp 1500 - 1509 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] données DORIS
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] orbitographie
[Termes IGN] qualité des données
[Termes IGN] série temporelleRésumé : (Auteur) Doppler Orbitography Radiopositionning Integrated by Satellite (DORIS) is one of the four fundamental techniques contributing to the ITRF. The optimal coverage over the globe of the DORIS observing sites and sites co-located with GPS, allow a strong embedding of DORIS within the ITRF network. DORIS contributes to the access to ITRF through precise orbit determination of altimetric satellites with onboard DORIS receivers. The DORIS contribution to the ITRF2008 is enhanced by the fact that the solutions of seven analysis centers were included in the submitted combined time series of weekly station positions and daily polar motion. We evaluate the quality of the DORIS combined solution in terms of its agreement with the other techniques (VLBI, SLR, GPS) contributing to the ITRF2008 combination. We show in particular that the precisions of the current IDS products range between 1.5 to 2.6 mm for station positions (at the epochs of minimum variances); better than 1 mm/yr in velocities and between 170 and 260 micro-arc-seconds for polar motion, a significant improvement by a factor of three to five, compared to past data used in the ITRF2005 combination. This improvement is certainly due to improved analysis strategies employed by the seven IDS analysis centers that contributed to the combined weekly submitted solutions of station positions and polar motion. A spectral analysis of DORIS station height time series indicates that annual and semi-annual signals are dominant. However, TOPEX draconitic period of about 118 days is still detected in about 20% of the station position power spectra. DORIS height annual signals correlate well with GPS annual signal estimated at some co-located stations, which show that DORIS technique is able to detect loading signals. Numéro de notice : A2010-363 Affiliation des auteurs : LAREG (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2010.03.010 Date de publication en ligne : 15/03/2010 En ligne : https://doi.org/10.1016/j.asr.2010.03.010 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30557
in Advances in space research > vol 45 n° 12 (15/06/2010) . - pp 1500 - 1509[article]Impact of regional reference frame definition on geodynamic interpretations / Juliette Legrand in Journal of geodynamics, vol 49 n° 3-4 (April 2010)
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Titre : Impact of regional reference frame definition on geodynamic interpretations Type de document : Article/Communication Auteurs : Juliette Legrand, Auteur ; Nicolas Bergeot, Auteur ; Carine Bruyninx, Auteur ; Guy Wöppelmann , Auteur ; Marie-Noëlle Bouin , Auteur ; Zuheir Altamimi , Auteur Année de publication : 2010 Article en page(s) : pp 116 - 122 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] champ de vitesse
[Termes IGN] données GNSS
[Termes IGN] Europe (géographie physique)
[Termes IGN] géodynamique
[Termes IGN] International Terrestrial Reference FrameRésumé : (auteur) Ten years (1997–2006) of weekly GNSS solutions of 205 globally distributed stations have been used to investigate the impact of the reference frame definition on the estimated station velocities. For that purpose, weekly regional solutions (covering the European region) and global solutions have been, respectively, stacked to obtain regional and global velocity fields. In both cases, the estimated long-term solutions (station positions and velocities) were tied to the ITRF2005 under minimal constraints using a selected set of reference stations. Several sets of global and regional reference stations were tested to evaluate first the impact of the reference frame definition on the global and regional velocity fields and later the impact on the derived geodynamic interpretations.
Results confirm that the regional velocity fields show systematic effects with respect to the global velocity field with differences reaching up to 1.3 mm/year in the horizontal and 2.9 mm/year in the vertical depending on the geographical extent of the network and the chosen set of regional reference stations.
In addition, the estimations of the Euler pole for Western Europe differ significantly when considering a global or a regional strategy. After removing the rigid block rotation, the residual velocity fields show differences which can reach up to 0.8 mm/year in horizontal component.
In Northern Europe, the vertical ground motion is dominated by the Glacial Isostatic Adjustment (GIA). A proper modeling of this effect requires sub-mm/year precision for the vertical velocities for latitudes below 56°. We demonstrate that a profile of vertical velocities shows significant discrepancies according to the reference frame definition strategy. In the case of regional solutions, the vertical modeling does not predict any subsidence around 52° as predicted by the global solution and previous studies.
In summary, we evidence the limitation of regional networks to reconstruct absolute velocity fields and conclude that when geodynamics require the highest precisions for the GNSS-based velocities, a global reference frame definition is more reliable.Numéro de notice : A2010-638 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.jog.2009.10.002 Date de publication en ligne : 14/10/2009 En ligne : https://doi.org/10.1016/j.jog.2009.10.002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89892
in Journal of geodynamics > vol 49 n° 3-4 (April 2010) . - pp 116 - 122[article]The angular velocities of the plates and the velocity of Earth's centre from space geodesy / Donald F. Argus in Geophysical journal international, vol 180 n° 3 (March 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])PermalinkEstimation of crustal vertical movements with GPS in a geocentric frame, within the framework of the TIGA project / Alvaro Santamaria Gomez (2010)PermalinkEtude des erreurs systématiques liées à la détermination du géocentre par les mesures DORIS / Marie-Line Gobinddass (2010)PermalinkPermalinkGlobal optimization of core station networks for space geodesy: application to the referencing of the SLR EOP with respect to ITRF / David Coulot in Journal of geodesy, vol 84 n° 1 (January 2010)PermalinkPermalinkPermalinkUnderstanding sea-level rise and variability, ch 9. Geodetic observations and global reference frame contributions to understanding sea-level rise and variability / Geoffrey Blewitt (2010)PermalinkPermalink