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Auteur Xavier Collilieux
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Documents disponibles écrits par cet auteur (121)
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Titre : Analysis and results of ITRF2008 Type de document : Rapport Auteurs : Zuheir Altamimi , Auteur ; Xavier Collilieux
, Auteur ; Laurent Métivier
, Auteur
Editeur : Francfort sur le Main : Bundesamt für Kartographie und Geodäsie Année de publication : 2012 Collection : IERS Technical note, ISSN 1019-4568 num. 37 Importance : 54 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-86482-046-5 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] analyse de données
[Termes IGN] géodésie spatiale
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] International Terrestrial Reference System
[Termes IGN] mise à jour
[Termes IGN] qualité des données
[Termes IGN] réseau géodésique
[Termes IGN] série temporelle
[Termes IGN] station permanenteIndex. décimale : 30.10 Systèmes de référence et réseaux géodésiques Résumé : (Auteur) The ITRF2008 is an improved realization of the International Terrestrial Reference System (ITRS) and is demonstrated to be of higher quality than the past ITRF versions. It is achieved in two-step procedure: (1) stacking the time series of station positions and Earth Orientation Parameters (EOPs) provided by four IERS Technique Centers (TC); (2) combining the longterm solutions as obtained in step 1, together with local ties in co-location sites. The two step procedure makes use of full variance-covariance information provided inSINEX format. The TC solutions incorporated in the ITRF2008 combination are free from any external constraints, thus preserving the actual space geodesy estimates of station positions, velocities and EOPs. The ITRF2008 origin is defined in such a way that it has zero translations and translation rates with respect to the mean Earth center of mass, averaged by the SLR station positions time series. Its scale is defined by nullifying the scale factor and its rate with respect to the mean of VLBI and SLR long-term solutions as obtained by stacking their respective time series. The ITRF2008 orientation (at epoch 2005.0) and its rate are aligned to the ITRF2005 using 179 stations of high geodetic quality. The ITRF2008 includes the positions and velocities of 934 stations located at 580 sites. [...] Note de contenu : 1. ITRF2008 input data
1.1. Space geodesy solutions
1.2. Local ties in co-location sites
2. ITRF2008 data analysis
2.1. Combination model
2.2. ITRF2008 frame definition
3.ITRF2008 Results
3.1. ITRF2008 origin and scale
3.2. ITRF2008 adjusted parameters
3.3. Transformation Parameters Between ITRF2008 and ITRF2005
3.4. Consistency between local ties and space geodesy estimates
4. Access to the ITRF2008 files References
Appendix
A1. ITRF2008 tie and space geodesy discrepancies
A2 . ITRF2008 Article
A3. Description of Technique Center solutionsNuméro de notice : 15774 Affiliation des auteurs : LASTIG LAREG (2012-mi2018) Thématique : POSITIONNEMENT Nature : Rapport de recherche DOI : sans En ligne : https://www.iers.org/IERS/EN/Publications/TechnicalNotes/tn37.html?nn=94912 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62774 Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 15774-01 30.10 Livre Centre de documentation Géodésie Disponible Documents numériques
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Analysis and results of ITRF2008 - pdfAdobe Acrobat PDFIGS International GNSS Service technical report 2012. Reference frame working group / Paul Rebischung (2012)
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Titre de série : IGS International GNSS Service technical report 2012 Titre : Reference frame working group Type de document : Chapitre/Contribution Auteurs : Paul Rebischung , Auteur ; Bruno Garayt
, Auteur ; Xavier Collilieux
, Auteur ; Zuheir Altamimi
, Auteur
Editeur : Pasadena : International GPS Service for Geodynamics IGS Année de publication : 2012 Importance : pp 175 - 182 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] format SINEX
[Termes IGN] international GPS service for geodynamics
[Termes IGN] International Terrestrial Reference FrameRésumé : [Introduction] Since February 2010, the Institut Géographique National (IGN) has replaced Natural Resources Canada (NRCan) as coordinator of the IGS Reference Frame Working Group. On the operational side, this coordination consists in combining the weekly SINEX solutions provided by the IGS final Analysis Centers (ACs) and updating a long–term cumulative solution each week (Kouba et al., 1998; Ferland and Piraszewski, 2009). The switch from NRCan to IGN was the opportunity to bring some changes to the SINEX combination strategy (Rebischung and Garayt, 2012). But the formats and contents of all products were kept unchanged so as to ensure a smooth transition. Besides a continuous monitoring of the SINEX combination results, the main achievement of the Reference Frame Working Group in 2011 was the publication of IGS08 (Rebischung et al., 2011), a new IGS reference frame based on ITRF2008 (Altamimi et al., 2011). Another specific effort was made to obtain a homogeneous set of weekly solutions based on the IGN combination strategy back to 1994 and to form a new, modernized IGS cumulative solution. Finally, a website that promotes the SINEX combination products has started to be developed and should be made publicly available in 2012. Numéro de notice : H2022-010 Affiliation des auteurs : LASTIG LAREG (2012-mi2018) Thématique : POSITIONNEMENT Nature : Chapître / contribution nature-HAL : ChRappRech Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=101266 Documents numériques
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IGS International GNSS... - pdf -Adobe Acrobat PDFITRF2008 contribution to glacial isostatic adjustment and recent ice melting assessment / Laurent Métivier in Geophysical research letters, vol 39 n° 1 (January 2012)
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[article]
Titre : ITRF2008 contribution to glacial isostatic adjustment and recent ice melting assessment Type de document : Article/Communication Auteurs : Laurent Métivier , Auteur ; Xavier Collilieux
, Auteur ; Zuheir Altamimi
, Auteur
Année de publication : 2012 Article en page(s) : 6 p. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] fonte des glaces
[Termes IGN] harmonique sphérique
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] modèle mathématique
[Termes IGN] rebond post-glaciaire
[Termes IGN] vitesseRésumé : (auteur) We investigate what information station vertical velocities of the ITRF2008 provide on global geodetic parameters and by extension on glacial isostatic adjustment (GIA) and recent ice melting (RIM) processes. We infer degree‐2 spherical harmonic coefficients (SHC) of the Earth figure change and theJ2 gravity rate (J˙2), which we compare with five GIA models. We find J˙2 to be (0.0 ± 2.4) × 10−11 yr−1, which is consistent with recent studies that propose a J˙2 change in the 1990s, due to RIM whose contribution to the J˙2 would be today around (3.5–4.0 ± 2.4) × 10−11 yr−1. Such results favor Peltier (2004) VM2 or Paulson et al. (2007) GIA models. The ITRF2008 SHC that are directly impacted by the GIA rotational feedback, confirm with a good precision recent results from GRACE mission that initiated a debate on GIA rotational feedback and about Peltier GIA model quality. We find a coefficient consistent with Paulson's (and other) model and more than 7 times smaller than coefficients in Peltier's models. Two explanations are possible: (1) if the model of Peltier (2004) VM2 were to be correct, then the strong rotational feedback in the model must be counteracted by a strong rotational feedback in the opposite direction generated by current ice loss, (2) if the model of Paulson et al. (2007) were to be correct, therefore GIA and RIM separately induce negligible rotational feedbacks. Both answers are quite extreme and call for more investigation on GIA modeling and rotational feedback. Numéro de notice : A2012-728 Affiliation des auteurs : LAREG (1991-2011) Thématique : POSITIONNEMENT Nature : Article DOI : 10.1029/2011GL049942 Date de publication en ligne : 14/01/2012 En ligne : https://doi.org/10.1029/2011GL049942 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90907
in Geophysical research letters > vol 39 n° 1 (January 2012) . - 6 p.[article]Documents numériques
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ITRF2008 contribution to glacial isostatic adjustment ... - pdf éditeurAdobe Acrobat PDFModèles de mouvement des plaques tectoniques : Le cas de l’ITRF2008 [diaporama] / Zuheir Altamimi (2012)
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Titre : Modèles de mouvement des plaques tectoniques : Le cas de l’ITRF2008 [diaporama] Type de document : Article/Communication Auteurs : Zuheir Altamimi , Auteur ; Laurent Métivier
, Auteur ; Xavier Collilieux
, Auteur
Editeur : Saint-Mandé : Institut national de l'information géographique et forestière - IGN (2012-) Année de publication : 2012 Conférence : Journées Recherche de l’IGN 2012, 21es Journées 08/03/2012 09/03/2012 Saint-Mandé France programme Importance : 23 p. Format : 30 x 21 cm Langues : Français (fre) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] rebond post-glaciaire
[Termes IGN] tectonique des plaquesRésumé : (Auteur) Numéro de notice : C2012-021 Affiliation des auteurs : LASTIG LAREG (2012-mi2018) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComSansActesPubliés-Unpublished DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64348 Documents numériques
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14365_diaporama_jr2012-altamimi.pdfAdobe Acrobat PDFStrategies to mitigate aliasing of loading signals while estimating GPS frame parameters / Xavier Collilieux in Journal of geodesy, vol 86 n° 1 (January 2012)
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[article]
Titre : Strategies to mitigate aliasing of loading signals while estimating GPS frame parameters Type de document : Article/Communication Auteurs : Xavier Collilieux , Auteur ; Tonie M. van Dam, Auteur ; Jim Ray, Auteur ; David Coulot
, Auteur ; Laurent Métivier
, Auteur ; Zuheir Altamimi
, Auteur
Année de publication : 2012 Projets : TOSCA / Article en page(s) : pp 1 - 14 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] crénelage
[Termes IGN] effet de charge
[Termes IGN] estimation statistique
[Termes IGN] géocentre
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] positionnement par GPSRésumé : (Auteur) Although GNSS techniques are theoretically sensitive to the Earth center of mass, it is often preferable to remove intrinsic origin and scale information from the estimated station positions since they are known to be affected by systematic errors. This is usually done by estimating the parameters of a linearized similarity transformation which relates the quasi-instantaneous frames to a long-term frame such as the International Terrestrial Reference Frame (ITRF). It is well known that non-linear station motions can partially alias into these parameters. We discuss in this paper some procedures that may allow reducing these aliasing effects in the case of the GPS techniques. The options include the use of well-distributed sub-networks for the frame transformation estimation, the use of site loading corrections, a modification of the stochastic model by downweighting heights, or the joint estimation of the low degrees of the deformation field. We confirm that the standard approach consisting of estimating the transformation over the whole network is particularly harmful for the loading signals if the network is not well distributed. Downweighting the height component, using a uniform sub-network, or estimating the deformation field perform similarly in drastically reducing the amplitude of the aliasing effect. The application of these methods to reprocessed GPS terrestrial frames permits an assessment of the level of agreement between GPS and our loading model, which is found to be about 1.5 mm WRMS in height and 0.8 mm WRMS in the horizontal at the annual frequency. Aliased loading signals are not the main source of discrepancies between loading displacement models and GPS position time series. Numéro de notice : A2012-117 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-011-0487-6 Date de publication en ligne : 08/11/2011 En ligne : https://doi.org/10.1007/s00190-011-0487-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31565
in Journal of geodesy > vol 86 n° 1 (January 2012) . - pp 1 - 14[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 266-2012011 RAB Revue Centre de documentation En réserve L003 Disponible Correction to “Topographically induced height errors in predicted atmospheric loading effects” / Tonie M. van Dam in Journal of geophysical research : Solid Earth, Vol 116 n° B11 (November 2011)
PermalinkITRF2008: an improved solution of the international terrestrial reference frame / Zuheir Altamimi in Journal of geodesy, vol 85 n° 8 (August 2011)
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PermalinkAccuracy of the International Terrestrial Reference Frame origin and Earth expansion / X. Wu in Geophysical research letters, vol 38 n° 13 (July 2011)
PermalinkQuality assessment of GPS reprocessed terrestrial reference frame / Xavier Collilieux in GPS solutions, vol 15 n° 3 (July 2011)
PermalinkApplication des algorithmes génétiques à la recherche de sous-réseaux de stations de télémétrie laser / David Coulot in Bulletin d'information scientifique et technique de l'IGN, n° 77 (avril 2011)
PermalinkImportance du système de référence terrestre dans la mesure du niveau des mers / Xavier Collilieux in Bulletin d'information scientifique et technique de l'IGN, n° 77 (avril 2011)
PermalinkITRF 2008 : nouvelle réalisation du système international de référence terrestre / Zuheir Altamimi in Bulletin d'information scientifique et technique de l'IGN, n° 77 (avril 2011)
PermalinkLes mouvements séculaires du géocentre, le réchauffement climatique et l'ITRF / Laurent Métivier in Bulletin d'information scientifique et technique de l'IGN, n° 77 (avril 2011)
PermalinkCorrelated errors in GPS position time series: Implications for velocity estimates / Alvaro Santamaria Gomez in Journal of geophysical research : Solid Earth, Vol 116 n° B1 (January 2011)
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enseignant-chercheur à l'ENSG (IGN)