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Mitigating the effects of vertical land motion in tide gauge records using a state-of-the-art GPS velocity field / Alvaro Santamaria Gomez in Global and Planetary Change, vol 98 - 99 (December 2012)
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Titre : Mitigating the effects of vertical land motion in tide gauge records using a state-of-the-art GPS velocity field Type de document : Article/Communication Auteurs : Alvaro Santamaria Gomez, Auteur ; Médéric Gravelle, Auteur ; Xavier Collilieux , Auteur ; M. Guichard, Auteur ; Bélen Martín Míguez, Auteur ; Pascal Tiphaneau, Auteur ; Guy Wöppelmann
, Auteur
Année de publication : 2012 Article en page(s) : pp 6 - 17 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] altimétrie satellitaire par radar
[Termes IGN] champ de vitesse
[Termes IGN] déformation verticale de la croute terrestre
[Termes IGN] données GPS
[Termes IGN] données marégraphiques
[Termes IGN] montée du niveau de la mer
[Termes IGN] niveau de la mer
[Termes IGN] série temporelleRésumé : (Auteur) This study aims to correct for long-term vertical land motions at tide gauges (TG) by estimating high-accurate GPS vertical velocities at co-located stations (GPS@TG), useful for long-term sea-level change studies and satellite altimeter drift monitoring. Global Positioning System (GPS) data reanalyses are mandatory when aiming at the highest consistency of the estimated products for the whole data period. The University of La Rochelle Consortium (ULR) has carried out several GPS data reanalysis campaigns with an increasing tracking network, an improving processing strategy and the best methodology. The geodetic results from the latest GPS velocity field estimated at ULR (named ULR5) are presented here. The velocity field includes 326 globally distributed GPS stations, from which 200 are GPS@TG (30% more than previous studies). The new GPS data processing strategy, the terrestrial frame definition and the velocity estimation procedures are described. The quality of the estimated vertical velocities is empirically assessed through internal and external velocity comparisons, including the analysis of the time-correlated noise content of the position time series, to be better than 0.6 mm/yr (2 sigma). The application of this velocity field is illustrated to appraise to what extent vertical land motions contaminate the estimates of satellite altimetry drifts. The impact on the altimeter-derived sea level trends was evaluated to be up to 0.6 mm/yr. Worldwide TGs were grouped into regions in order to explore long-term spatial sea level variability in the rates of sea level change. By taking into account the vertical land motion of the tide gauges, the dispersion of the observed sea level rates within each region was reduced by 60%. Long-term regional mean sea level variations up to 70% from the global mean were found. Numéro de notice : A2012-741 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.gloplacha.2012.07.007 Date de publication en ligne : 26/07/2012 En ligne : https://doi.org/10.1016/j.gloplacha.2012.07.007 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91477
in Global and Planetary Change > vol 98 - 99 (December 2012) . - pp 6 - 17[article]Plans jet in motion for GPS: Receivers will operate in environments impossible today / B. Bruber in GPS world, vol 23 n° 12 (December 2012)
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Titre : Plans jet in motion for GPS: Receivers will operate in environments impossible today Type de document : Article/Communication Auteurs : B. Bruber, Auteur Année de publication : 2012 Article en page(s) : pp 14 - 15 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] constellation GPS
[Termes IGN] récepteur GPS
[Termes IGN] secteur spatial
[Termes IGN] secteur terrien
[Termes IGN] signal GPS
[Termes IGN] utilisateurNuméro de notice : A2012-621 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32067
in GPS world > vol 23 n° 12 (December 2012) . - pp 14 - 15[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-2012121 RAB Revue Centre de documentation En réserve L003 Disponible The 2008 DGFI realization of the ITRS: DTRF2008 / Manuela Seitz in Journal of geodesy, vol 86 n° 12 (December 2012)
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Titre : The 2008 DGFI realization of the ITRS: DTRF2008 Type de document : Article/Communication Auteurs : Manuela Seitz, Auteur ; Detlef Angermann, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 1097 - 1123 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] Institut national de l'information géographique et forestière (France)
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] International Terrestrial Reference System
[Termes IGN] station permanente
[Termes IGN] système de positionnement par satellitesRésumé : (Auteur) A new realization of the International Terrestrial System was computed at the ITRS Combination Centre at DGFI as a contribution to ITRF2008. The solution is labelled DTRF2008. In the same way as in the DGFI computation for ITRF2005 it is based on either normal equation systems or estimated parameters derived from VLBI, SLR, GPS and DORIS observations by weekly or session-wise processing. The parameter space of the ITRS realization comprises station positions and velocities and daily resolved Earth Orientation Parameters (EOP), whereby for the first time also nutation parameters are included. The advantage of starting from time series of input data is that the temporal behaviour of geophysical parameters can be investigated to decide whether the parameters can contribute to the datum realization of the ITRF. In the same way, a standardized analysis of station position time series can be performed to detect and remove discontinuities. The advantage of including EOP in the ITRS realization is twofold: (1) the combination of the coordinates of the terrestrial pole—estimated from all contributing techniques—links the technique networks in two components of the orientation, leading to an improvement of consistency of the Terrestrial Reference Frame (TRF) and (2) in their capacity as parameters common to all techniques, the terrestrial pole coordinates enhance the selection of local ties as they provide a measure for the consistency of the combined frame. The computation strategy of DGFI is based on the combination of normal equation systems while at the ITRS Combination Centre at IGN solutions are combined. The two independent ITRS realizations provide the possibility to assess the accuracy of ITRF by comparison of the two frames. The accuracy evaluation was done separately for the datum parameters (origin, orientation and scale) and the network geometry. The accuracy of the datum parameters, assessed from the comparison of DTRF2008 and ITRF2008, is between 2–5 mm and 0.1–0.8 mm/year depending on the technique. The network geometry (station positions and velocities) agrees within 3.2 mm and 1.0 mm/year. A comparison of DTRF2008 and ITRF2005 provides similar results for the datum parameters, but there are larger differences for the network geometry. The internal accuracy of DTRF2008—that means the level of conservation of datum information and network geometry within the combination—was derived from comparisons with the technique-only multi-year solutions. From this an internal accuracy of 0.32 mm for the VLBI up to 3.3 mm for the DORIS part of the network is found. The internal accuracy of velocities ranges from 0.05 mm/year for VLBI to 0.83 mm/year for DORIS. The internal consistency of DTRF2008 for orientation can be derived from the analysis of the terrestrial pole coordinates. It is estimated at 1.5–2.5 mm for the GPS, VLBI and SLR parts of the network. The consistency of these three and the DORIS network part is within 6.5 mm. Numéro de notice : A2012-650 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-012-0567-2 Date de publication en ligne : 04/05/2012 En ligne : https://doi.org/10.1007/s00190-012-0567-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32096
in Journal of geodesy > vol 86 n° 12 (December 2012) . - pp 1097 - 1123[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2012121 RAB Revue Centre de documentation En réserve L003 Disponible Navipedia, the GNSS Wiki: A reference for Global Navigation Satellite Systems / Teresa Ferreira in Inside GNSS, vol 7 n° 6 (November - December 2012)
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Titre : Navipedia, the GNSS Wiki: A reference for Global Navigation Satellite Systems Type de document : Article/Communication Auteurs : Teresa Ferreira, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 59 - 64 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] Global Navigation Satellite System
[Termes IGN] site wikiRésumé : (Auteur) Satellite navigation is progressing at such a rapid pace that it is difficult to keep track of the latest evolutions, satellite launches, technologies or even systems and signals. With Navipedia, the European Space Agency has introduced a common online entry point for GNSS know-how. As with all media-wiki products, any registered user can comment, propose modification to an existing article, suggest a new topic or submit a draft article. However, Navipedia has something many other wikis don’t: a robust content management and control process managed by an editorial team of knowledgeable GNSS professionals to ensure that the website always remains updated and reliable. Numéro de notice : A2012-671 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32117
in Inside GNSS > vol 7 n° 6 (November - December 2012) . - pp 59 - 64[article]Documents numériques
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a2012-671_navipedia.pdfAdobe Acrobat PDFOn the detection of systematic errors in terrestrial laser scanning data / J. Wang in Journal of applied geodesy, vol 6 n° 3-4 (November 2012)
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Titre : On the detection of systematic errors in terrestrial laser scanning data Type de document : Article/Communication Auteurs : J. Wang, Auteur ; H. Kutterer, Auteur ; X. Fang, Auteur Année de publication : 2012 Article en page(s) : pp 187 - 192 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] algorithme ICP
[Termes IGN] barrage
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] erreur systématique
[Termes IGN] lasergrammétrie
[Termes IGN] modèle de Gauss-Helmert
[Termes IGN] segmentation d'image
[Termes IGN] télémétrie laser sur satelliteRésumé : (Auteur) Quality descriptions are parts of the key tasks of geodetic data processing. Systematic errors should be detected and avoided in order to insure the high quality standards required by structural monitoring. In this study, the iterative closest point (ICP) method was invested to detect systematic errors in two overlapping data sets. There are three steps to process the systematic errors: firstly, one of the data sets was transformed to a reference system by the introduction of the Gauss–Helmert (GH) model. Secondly, quadratic form estimation and segmentation methods are proposed to guarantee the overlapping data sets. Thirdly, the ICP method was employed for a finer registration and detecting the systematic errors. A case study was casted in which a dam surface in Germany was scanned by terrestrial laser scanning (TLS) technology. The results indicated that with the conjugation of ICP algorithm the accuracy of the data sets was improved approximately by 1.6 mm. Numéro de notice : A2012-598 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1515/jag-2012-0025 En ligne : http://www.degruyter.com/view/j/jag.2012.6.issue-3-4/jag-2012-0025/jag-2012-0025 [...] Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32044
in Journal of applied geodesy > vol 6 n° 3-4 (November 2012) . - pp 187 - 192[article]Zero-difference GPS ambiguity resolution at CNES–CLS IGS Analysis Center / Sylvain Loyer in Journal of geodesy, vol 86 n° 11 (November 2012)
PermalinkBistatic system and baseline calibration in TanDEM-X to ensure the global digital elevation model quality / J. Hueso Gonzales in ISPRS Journal of photogrammetry and remote sensing, vol 73 (September 2012)
Permalinkn° 198 - 199 - Septembre 2012 - Brésil (Bulletin de Revue Française de Photogrammétrie et de Télédétection) / Société française de photogrammétrie et de télédétection
PermalinkExploiting the Galileo E5 wideband signal for improved single-frequency precise positioning / H. Toho Diessongo in Inside GNSS, vol 7 n° 5 (September - October 2012)
PermalinkPenser le plan archéologique comme un système d'information : L'exemple du site médiéval de Qalhät (Oman) / Olivier Barge in Revue internationale de géomatique, vol 22 n° 3 (septembre - novembre 2012)
PermalinkVector delay lock loops: How do vector delay lock loops predict the satellite signals? / M. Lashley in Inside GNSS, vol 7 n° 5 (September - October 2012)
PermalinkImproving the estimation of fractional-cycle biases for ambiguity resolution in precise point positioning / J. Geng in Journal of geodesy, vol 86 n° 8 (August 2012)
PermalinkLand water storage changes from ground and space geodesy : first results from the GHYRAF (Gravity and Hydrology in Africa) experiment / Jacques Hinderer in Pure and applied geophysics, vol 169 n° 8 (August 2012)
PermalinkSpace weather and the Australian ionospheric prediction service: ready for the Solar Max 2012 / Dave Neudegg in Space research today, n° 184 (01/08/2012)
PermalinkTotal least squares adjustment in partial errors-in-variables models: algorithm and statistical analysis / P. Xu in Journal of geodesy, vol 86 n° 8 (August 2012)
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