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Mission design, operation and exploitation of the gravity field and steady-state ocean circulation explorer mission / R. Floberghagen in Journal of geodesy, vol 85 n° 11 (November /2011)
[article]
Titre : Mission design, operation and exploitation of the gravity field and steady-state ocean circulation explorer mission Type de document : Article/Communication Auteurs : R. Floberghagen, Auteur ; M. Fehringer, Auteur ; D. Lamarre, Auteur ; D. Muzi, Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : pp 749 - 758 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] circulation océanique
[Termes IGN] données GOCE
[Termes IGN] géoïde terrestre
[Termes IGN] GOCE
[Termes IGN] gradient de gravitation
[Termes IGN] gradiomètre
[Termes IGN] gravimétrie spatialeRésumé : (Auteur) The European Space Agency’s Gravity field and steady-state ocean circulation explorer mission (GOCE) was launched on 17 March 2009. As the first of the Earth Explorer family of satellites within the Agency’s Living Planet Programme, it is aiming at a better understanding of the Earth system. The mission objective of GOCE is the determination of the Earth’s gravity field and geoid with high accuracy and maximum spatial resolution. The geoid, combined with the de facto mean ocean surface derived from twenty-odd years of satellite radar altimetry, yields the global dynamic ocean topography. It serves ocean circulation and ocean transport studies and sea level research. GOCE geoid heights allow the conversion of global positioning system (GPS) heights to high precision heights above sea level. Gravity anomalies and also gravity gradients from GOCE are used for gravity-to-density inversion and in particular for studies of the Earth’s lithosphere and upper mantle. GOCE is the first-ever satellite to carry a gravitational gradiometer, and in order to achieve its challenging mission objectives the satellite embarks a number of world-first technologies. In essence the spacecraft together with its sensors can be regarded as a spaceborne gravimeter. In this work, we describe the mission and the way it is operated and exploited in order to make available the best-possible measurements of the Earth gravity field. The main lessons learned from the first 19 months in orbit are also provided, in as far as they affect the quality of the science data products and therefore are of specific interest for GOCE data users. Numéro de notice : A2011-467 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-011-0498-3 Date de publication en ligne : 18/10/2011 En ligne : https://doi.org/10.1007/s00190-011-0498-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31361
in Journal of geodesy > vol 85 n° 11 (November /2011) . - pp 749 - 758[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2011111 RAB Revue Centre de documentation En réserve L003 Disponible Validation of GOCE gravity field models by means of orbit residuals and geoid comparisons / Thomas Gruber in Journal of geodesy, vol 85 n° 11 (November /2011)
[article]
Titre : Validation of GOCE gravity field models by means of orbit residuals and geoid comparisons Type de document : Article/Communication Auteurs : Thomas Gruber, Auteur ; P. Visser, Auteur ; C. Ackermann, Auteur ; M. Hosse, Auteur Année de publication : 2011 Article en page(s) : pp 845 - 860 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] analyse comparative
[Termes IGN] analyse de variance
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] données GOCE
[Termes IGN] données GRACE
[Termes IGN] géoïde gravimétrique
[Termes IGN] géoïde terrestre
[Termes IGN] harmonique sphérique
[Termes IGN] limite de résolution géométrique
[Termes IGN] orbitographie
[Termes IGN] résiduRésumé : (Auteur) Three GOCE-based gravity field solutions have been computed by ESA’s high-level processing facility and were released to the user community. All models are accompanied by variance-covariance information resulting either from the least squares procedure or a Monte-Carlo approach. In order to obtain independent external quality parameters and to assess the current performance of these models, a set of independent tests based on satellite orbit determination and geoid comparisons is applied. Both test methods can be regarded as complementary because they either investigate the performance in the long wavelength spectral domain (orbit determination) or in the spatial domain (geoid comparisons). The test procedure was applied to the three GOCE gravity field solutions and to a number of selected pre-launch models for comparison. Orbit determination results suggest, that a pure GOCE gravity field model does not outperform the multi-year GRACE gravity field solutions. This was expected as GOCE is designed to improve the determination of the medium to high frequencies of the Earth gravity field (in the range of degree and order 50 to 200). Nevertheless, in case of an optimal combination of GOCE and GRACE data, orbit determination results should not deteriorate. So this validation procedure can also be used for testing the optimality of the approach adopted for producing combined GOCE and GRACE models. Results from geoid comparisons indicate that with the 2 months of GOCE data a significant improvement in the determination of the spherical harmonic spectrum of the global gravity field between degree 50 and 200 can be reached. Even though the ultimate mission goal has not yet been reached, especially due to the limited time span of used GOCE data (only 2 months), it was found that existing satellite-only gravity field models, which are based on 7 years of GRACE data, can already be enhanced in terms of spatial resolution. It is expected that with the accumulation of more GOCE data the gravity field model resolution and quality can be further enhanced, and the GOCE mission goal of 1–2 cm geoid accuracy with 100 km spatial resolution can be achieved. Numéro de notice : A2011-470 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-011-0486-7 Date de publication en ligne : 08/06/2011 En ligne : https://doi.org/10.1007/s00190-011-0486-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31364
in Journal of geodesy > vol 85 n° 11 (November /2011) . - pp 845 - 860[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2011111 RAB Revue Centre de documentation En réserve L003 Disponible Transverse Mercator with an accuracy of a few nanometers / C. Karney in Journal of geodesy, vol 85 n° 8 (August 2011)
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Titre : Transverse Mercator with an accuracy of a few nanometers Type de document : Article/Communication Auteurs : C. Karney, Auteur Année de publication : 2011 Article en page(s) : pp 475 - 485 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Projections
[Termes IGN] convergence des méridiens
[Termes IGN] ellipsoïde (géodésie)
[Termes IGN] précision submillimétrique
[Termes IGN] projection
[Termes IGN] projection conforme
[Termes IGN] projection de Gauss
[Termes IGN] projection Universal Transverse MercatorRésumé : (Auteur) Implementations of two algorithms for the transverse Mercator projection are described; these achieve accuracies close to machine precision. One is based on the exact equations of Thompson and Lee and the other uses an extension of Krüger’s series for the mapping to higher order. The exact method provides an accuracy of 9 nm over the entire ellipsoid, while the errors in the series method are less than 5 nm within 3900 km of the central meridian. In each case, the meridian convergence and scale are also computed with similar accuracy. The speed of the series method is competitive with other less accurate algorithms and the exact method is about five times slower. Numéro de notice : A2011-357 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-011-0445-3 Date de publication en ligne : 09/02/2011 En ligne : https://doi.org/10.1007/s00190-011-0445-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31136
in Journal of geodesy > vol 85 n° 8 (August 2011) . - pp 475 - 485[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2011081 RAB Revue Centre de documentation En réserve L003 Disponible Pacific geoid anomalies revisited in light of thermochemical oscillating domes in the lower mantle / Cécilia Cadio in Earth and planetary science letters, vol 306 n° 1-2 (June 2011)
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Titre : Pacific geoid anomalies revisited in light of thermochemical oscillating domes in the lower mantle Type de document : Article/Communication Auteurs : Cécilia Cadio, Auteur ; Isabelle Panet , Auteur ; Anne Davaille, Auteur ; Michel Diament , Auteur ; Laurent Métivier , Auteur ; Olivier de Viron, Auteur Année de publication : 2011 Article en page(s) : pp 123 - 135 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] anomalie de pesanteur
[Termes IGN] convection
[Termes IGN] données GRACE
[Termes IGN] géoïde local
[Termes IGN] levé gravimétrique
[Termes IGN] manteau terrestre
[Termes IGN] oscillation
[Termes IGN] Pacifique (océan)
[Termes IGN] Polynésie française
[Termes IGN] volcanRésumé : (auteur) The geoid low over French Polynesia has been previously interpreted as the signature of an upper mantle upwelling associated with a low-viscosity zone located immediately below the lithosphere. We propose here an alternative explanation using new high-quality satellite gravity data and fluid mechanics constraints. We thus discuss the origin of the high concentration of hotspots in the Central Pacific, which is still debated. Satellite gravity data from the GRACE mission analyzed with wavelets allow us to better characterize the geoid low on French Polynesia and the large-scale positive geoid anomaly 600 km east of the Line Islands chain. We show that the geoid anomalies are consistent with thermochemical oscillating domes and we bring constraints on their density contrast and their upper limit depth under this hypothesis. The Central Pacific mantle would contain two thermochemical instabilities at different stages of their development: a rising dome (lighter) extending approximately from the CMB up to the transition zone beneath the South Pacific Superswell, toped by secondary plumes that generate short-lived hot spot chains, and a sinking dome (denser) in the lower mantle beneath the area located 600 km east of the Line Islands chain. Plate reconstructions further show that the latter could also have generated the Southern Line Islands 35 M.y. ago and Shatsky Rise 140 M.y. ago when it was in its ascending phase, while the South Pacific dome probably created Darwin Rise 100 M.y. ago in a same type of event. Numéro de notice : A2011-599 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.epsl.2011.03.040 Date de publication en ligne : 22/04/2011 En ligne : https://doi.org/10.1016/j.epsl.2011.03.040 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91645
in Earth and planetary science letters > vol 306 n° 1-2 (June 2011) . - pp 123 - 135[article]PostGIS pour les néophytes (4ème partie) / Anonyme in Géomatique expert, n° 80 (01/05/2011)
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Titre : PostGIS pour les néophytes (4ème partie) Type de document : Article/Communication Auteurs : Anonyme, Auteur Année de publication : 2011 Article en page(s) : pp 40 - 45 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique
[Termes IGN] barycentre
[Termes IGN] centroïde
[Termes IGN] ellipsoïde de référence
[Termes IGN] mesurage de distances
[Termes IGN] opérateur spatial
[Termes IGN] PostGIS
[Termes IGN] primitive géométrique
[Termes IGN] projection
[Termes IGN] système de référence géodésiqueRésumé : (Auteur) Nous continuons notre découverte des principaux opérateurs spatiaux de PostGIS, avec, ce mois-ci, quelques fonctions moins communes. Nous abordons aussi les primitives géodésiques : définition des systèmes de référence, reprojections et mesures de longueur ellipsoïdales vraies. Numéro de notice : A2011-194 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30972
in Géomatique expert > n° 80 (01/05/2011) . - pp 40 - 45[article]Voir aussiRéservation
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Code-barres Cote Support Localisation Section Disponibilité 265-2011031 RAB Revue Centre de documentation En réserve L003 Disponible IFN-001-P001257 PER Revue Nogent-sur-Vernisson Salle périodiques Exclu du prêt Assessment of systematic errors in the computation of gravity gradients from satellite altimeter data / Johannes Bouman in Marine geodesy, vol 34 n° 2 (April - June 2011)PermalinkHyperboloïdal coordinates : transformations and applications in special constructions / J. Feltens in Journal of geodesy, vol 85 n° 4 (April 2011)PermalinkReprésentations en ondelettes du champ de pesanteur / Isabelle Panet in Bulletin d'information scientifique et technique de l'IGN, n° 77 (avril 2011)PermalinkThe AUSGeoid09 model of the Australian Height Datum / Will E. Featherstone in Journal of geodesy, vol 85 n° 3 (March 2011)PermalinkSatellites / Michel Capderou (2011)PermalinkThe combination of GNSS-levelling data and gravimetric (quasi-) geoid heights in the presence of noise / R. Klees in Journal of geodesy, vol 84 n° 12 (December 2010)PermalinkA comparison of recent Earth gravitational models with emphasis on their contribution in refining the gravity and geoid at continental or regional scale / D. Arabelos in Journal of geodesy, vol 84 n° 11 (November 2010)PermalinkCombining EGM2008 and SRTM/DTM2006.0 residual terrain model data to improve quasigeoid computations in mountainous areas devoid of gravity data / C. Hirt in Journal of geodesy, vol 84 n° 9 (September 2010)PermalinkDéveloppement d’un système léger de gravimétrie mobile : LiMoG / José Cali in Revue des Systèmes (RS) - Instrumentation - Mesure - Métrologie (Série I2M), vol 10 n° 3-4 (Juillet - Décembre 2010)PermalinkTuning a gravimetric quasigeoid to GPS-levelling by non-stationary least-squares collocation / N. Darbehesti in Journal of geodesy, vol 84 n° 7 (July 2010)PermalinkAssessing the accuracy of GEOID03 and GEOID09 in Connecticut / Thomas H. Meyer in SaLIS Surveying and land information science, vol 70 n° 2 (Summer 2010)PermalinkCan mean values of Helmert's gravity anomalies be continued downward directly? / Petr Vanicek in Geomatica, vol 64 n° 2 (June 2010)PermalinkMantle dynamics, geoid, inertia and TPW since 120 Myr / Hélène Rouby in Earth and planetary science letters, vol 292 n° 3-4 (April 2010)PermalinkEstablishment of an empirical Geoid Model for a small geographic area: a case study of Port Harcourt, Nigeria / J. Olaleye in SaLIS Surveying and land information science, vol 70 n° 1 (Spring 2010)PermalinkA bias-free geodetic boundary value problem approach to height datum unification / Alireza A. Ardalan in Journal of geodesy, vol 84 n° 2 (February 2010)PermalinkFinite element method for solving geodetic boundary value problems / Z. Faskova in Journal of geodesy, vol 84 n° 2 (February 2010)PermalinkFundamental gravity network of the Republic Croatia in the function of control and improving of national and European geoid model / I. Grgic (01/01/2010)PermalinkPreliminary works on creation of the new geoid model HRG2009 / I. Grgic (01/01/2010)PermalinkPermalinkSea surface topography and marine geoid by airborne laser altimetry and shipborne ultrasound altimetry / Philippe Limpach (2010)Permalink