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The height datum problem and the role of satellite gravity models / A. Gatti in Journal of geodesy, vol 87 n° 1 (January 2013)
[article]
Titre : The height datum problem and the role of satellite gravity models Type de document : Article/Communication Auteurs : A. Gatti, Auteur ; M. Reguzzoni, Auteur ; Giovanna Venuti, Auteur Année de publication : 2013 Article en page(s) : pp 15 - 22 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] altitude normale
[Termes IGN] anomalie de pesanteur
[Termes IGN] données GOCE
[Termes IGN] données GRACE
[Termes IGN] Earth Gravity Model 2008
[Termes IGN] erreur en altitude
[Termes IGN] erreur systématique
[Termes IGN] géoïde altimétrique
[Termes IGN] hauteur ellipsoïdale
[Termes IGN] modèle de géopotentiel
[Termes IGN] niveau moyen des mers
[Termes IGN] réseau de nivellement
[Termes IGN] système de référence altimétriqueRésumé : (Auteur) Regional height systems do not refer to a common equipotential surface, such as the geoid. They are usually referred to the mean sea level at a reference tide gauge. As mean sea level varies (by +1 to 2 m) from place to place and from continent to continent each tide gauge has an unknown bias with respect to a common reference surface, whose determination is what the height datum problem is concerned with. This paper deals with this problem, in connection to the availability of satellite gravity missions data. Since biased heights enter into the computation of terrestrial gravity anomalies, which in turn are used for geoid determination, the biases enter as secondary or indirect effect also in such a geoid model. In contrast to terrestrial gravity anomalies, gravity and geoid models derived from satellite gravity missions, and in particular GRACE and GOCE, do not suffer from those inconsistencies. Those models can be regarded as unbiased. After a review of the mathematical formulation of the problem, the paper examines two alternative approaches to its solution. The first one compares the gravity potential coefficients in the range of degrees from 100 to 200 of an unbiased gravity field from GOCE with those of the combined model EGM2008, that in this range is affected by the height biases. This first proposal yields a solution too inaccurate to be useful. The second approach compares height anomalies derived from GNSS ellipsoidal heights and biased normal heights, with anomalies derived from an anomalous potential which combines a satellite-only model up to degree 200 and a high-resolution global model above 200. The point is to show that in this last combination the indirect effects of the height biases are negligible. To this aim, an error budget analysis is performed. The biases of the high frequency part are proved to be irrelevant, so that an accuracy of 5 cm per individual GNSS station is found. This seems to be a promising practical method to solve the problem. Numéro de notice : A2013-070 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-012-0574-3 Date de publication en ligne : 03/07/2012 En ligne : https://doi.org/10.1007/s00190-012-0574-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32208
in Journal of geodesy > vol 87 n° 1 (January 2013) . - pp 15 - 22[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2013011 SL Revue Centre de documentation Revues en salle Disponible Time, atomics clocks and relativistic geodesy / Enrico Mai (2013)
Titre : Time, atomics clocks and relativistic geodesy Type de document : Monographie Auteurs : Enrico Mai, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2013 Collection : DGK - A Sous-collection : Theoretische Geodäsie num. 124 Importance : 126 p. Format : 31 x 30 cm ISBN/ISSN/EAN : 978-3-7696-8204-5 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] horloge atomique
[Termes IGN] temps atomique international
[Termes IGN] temps de propagation
[Termes IGN] théorie de la relativitéIndex. décimale : 30.43 Travaux de géodésie physique Résumé : (Documentaliste) Après une première partie qui passé en revue les notions de temps, les effets de la relativité sont abordés. Puis l'auteur se focalise sur les problèmes de temps et de transfert de fréquence en géodésie spatiale concernés par la relativité. L'usage des horloges atomiques en géodésie nécessite un cadre mathématique particulier. Une approche de la géodésie relativiste est développée, elle établit par exemple, le concept de géoïde relativiste et introduit des réflexions en géodésie physique notamment. Note de contenu : Introduction
Time
1 The search for the nature of time
2 The measurement of time
3 The different notions of time
4 The problem of a unified concept of time
5 The role of fundamental quantities and physical dimensions
6 The realization of time scales
7 The choice of an underlying theory and its impact on definitions
8 The backing of a theory by experiments
9 The different kinds of geometry
10 The fundamental role of the line element
Relativistic Effects
11 Testing the concept of relativity
12 Focussing on Einstein's theory of relativity
13 Testing relativity via earthbound and space-bound experiments
14 Alternative modeling of gravitation
15 Progression of the interferometric method for relativity testing
16 Clocks as relativistic sensors
17 Apparent limits on the resolution
Transition to relativistic geodesy
18 Selected technological issues
19 Clock networks requiring time and frequency transfer
20 Time and frequency transfer via clock transportation
21 Time and frequency transfer via signal transmission
22 Time and frequency transfer methods
Geodetic use of atomic clocks
23 Decorrelation of physical effects by means of clock readings
24 From theoretical relativistic framework to real world scenarios
25 The resurrection of the chronometric leveling idea .
26 The improvement of gravity field determination techniques
27 Further potential applications of highly precise atomic clocks
28 The relativistic approach in satellite orbit calculation
Outline of the mathematical framework
29 Introduction of fundamental relations
29.1 Equation of a geodesic
29.2 Riemannian curvature tensor
29.3 Edtvos tensor and Marussi tensor
29.4 Ricci curvature tensor and fundamental metric tensors
29.5 Line element and special relativity
29.6 Proper time and generalized Doppler effect
29.7 Gravity and space-time metric
29.8 Einstein field equations
29.9 Special case: Schwarzschild metric and resulting testable relativistic effects
29.10 Inertial systems and general relativity
29.11 Geodesic deviation equation
29.12 Separability of different kinds of forces
29.13 Various relativistic effects
29.14 Proper time and gravitational time delay
29.15 Superposition and magnitude of individual relativistic effects
30 Essential expressions for relativistic geodesy
30.1 Specific relations between coordinate time and proper time
30.2 Problem-dependent fixing of the tensors
30.3 BK-approach vs DSX-approach
30.4 Celestial reference system connected to the (solar-system) barycenter
30.5 Celestial reference system connected to the geocenter
30.6 Classical spherical harmonics and relativistic multipole moments
30.7 Earth's metric potentials in relativistic mass and spin multipole moments
30.8 Transformation between global and local reference systems
30.9 External and tidal potentials in post-Newtonian approximation
30.10 Transformation between BCRS and GCRS
30.11 Remarks on various spin-related terms
30.12 Remarks on various kinds of mass-multipole moments
30.13 Gravitational potential knowledge and time transformation
30.14 Topocentric reference system connected to (earthbound) observation sites
30.15 Specific relations between geocentric time and proper time
30.16 Post-Newtonian gravimetry and gradiometry
30.17 Definition of a relativistic geoid
Clock based height determination
31 Practical time scales and their relations
32 Potential differences and classical height systems
33 The global vertical datum problem
34 Introductory remarks on the displacement of observation sites
35 Introductory remarks on tides and the tidal potential
36 The modeling of tides
37 Tidal displacement and the role of Love and Shida numbers
38 Details on the tidal potential and resulting displacements
39 Sensitivity of clocks to tidally induced potential differences
40 Sensitivity of clocks to the tidally induced Doppler effect
41 Concluding remarks on the comparison of clocks
Outlook ReferencesNuméro de notice : 15742 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62767 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15742-01 30.43 Livre Centre de documentation Géodésie Disponible High-frequency signal and noise estimates of CSR GRACE RL04 / J.A. Bonin in Journal of geodesy, vol 86 n° 12 (December 2012)
[article]
Titre : High-frequency signal and noise estimates of CSR GRACE RL04 Type de document : Article/Communication Auteurs : J.A. Bonin, Auteur ; S. Bettadpur, Auteur ; B. Tapley, Auteur Année de publication : 2012 Article en page(s) : pp 1165 - 1177 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] bruit (théorie du signal)
[Termes IGN] données GRACE
[Termes IGN] erreur
[Termes IGN] filtrage du bruit
[Termes IGN] force de gravitation
[Termes IGN] levé gravimétrique
[Termes IGN] rapport signal sur bruit
[Termes IGN] traitement du signalRésumé : (Auteur) A sliding window technique is used to create daily-sampled Gravity Recovery and Climate Experiment (GRACE) solutions with the same background processing as the official CSR RL04 monthly series. By estimating over shorter time spans, more frequent solutions are made using uncorrelated data, allowing for higher frequency resolution in addition to daily sampling. Using these data sets, high-frequency GRACE errors are computed using two different techniques: assuming the GRACE high-frequency signal in a quiet area of the ocean is the true error, and computing the variance of differences between multiple high-frequency GRACE series from different centers. While the signal-to-noise ratios prove to be sufficiently high for confidence at annual and lower frequencies, at frequencies above 3 cycles/year the signal-to-noise ratios in the large hydrological basins looked at here are near 1.0. Comparisons with the GLDAS hydrological model and high frequency GRACE series developed at other centers confirm CSR GRACE RL04’s poor ability to accurately and reliably measure hydrological signal above 3–9 cycles/year, due to the low power of the large-scale hydrological signal typical at those frequencies compared to the GRACE errors. Numéro de notice : A2012-651 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-012-0572-5 Date de publication en ligne : 03/06/2012 En ligne : https://doi.org/10.1007/s00190-012-0572-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32097
in Journal of geodesy > vol 86 n° 12 (December 2012) . - pp 1165 - 1177[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2012121 RAB Revue Centre de documentation En réserve L003 Disponible Intersatellite laser ranging instrument for the GRACE follow-on mission / B. Sheard in Journal of geodesy, vol 86 n° 12 (December 2012)
[article]
Titre : Intersatellite laser ranging instrument for the GRACE follow-on mission Type de document : Article/Communication Auteurs : B. Sheard, Auteur ; Gerhard Heinzel, Auteur ; K. Danzmann, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 1083 - 1095 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] GRACE
[Termes IGN] mission spatiale
[Termes IGN] poursuite de satellite
[Termes IGN] surveillanceRésumé : (Auteur) The Gravity Recovery and Climate Experiment (GRACE) has demonstrated that low–low satellite-to-satellite tracking enables monitoring the time variations of the Earth’s gravity field on a global scale, in particular those caused by mass-transport within the hydrosphere. Due to the importance of long-term continued monitoring of the variations of the Earth’s gravitational field and the limited lifetime of GRACE, a follow-on mission is currently planned to be launched in 2017. In order to minimise risk and the time to launch, the follow-on mission will be basically a rebuild of GRACE with microwave ranging as the primary instrument for measuring changes of the intersatellite distance. Laser interferometry has been proposed as a method to achieve improved ranging precision for future GRACE-like missions and is therefore foreseen to be included as demonstrator experiment in the follow-on mission now under development. This paper presents the top-level architecture of an interferometric laser ranging system designed to demonstrate the technology which can also operate in parallel with the microwave ranging system of the GRACE follow-on mission. Numéro de notice : A2012-649 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-012-0566-3 Date de publication en ligne : 08/05/2012 En ligne : https://doi.org/10.1007/s00190-012-0566-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32095
in Journal of geodesy > vol 86 n° 12 (December 2012) . - pp 1083 - 1095[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2012121 RAB Revue Centre de documentation En réserve L003 Disponible 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)
[article]
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]Recent changes of the Earth’s core derived from satellite observations of magnetic and gravity fields / Mioara Mandea in Proceedings of the National Academy of Sciences of the United States of America PNAS, vol 109 n° 47 (November 2012)PermalinkNontidal ocean loading: amplitudes and potential effects in GPS height time series / Tonie M. van Dam in Journal of geodesy, vol 86 n° 11 (November 2012)PermalinkOn computing ellipsoidal harmonics using Jekeli’s renormalization / J. Sebera in Journal of geodesy, vol 86 n° 9 (September 2012)PermalinkReducing errors in the GRACE gravity solutions using regularization / H. Save in Journal of geodesy, vol 86 n° 9 (September 2012)PermalinkMonitoring GOCE gradiometer calibration parameters using accelerometer and star sensor data: methodology and first results / C. Siemes in Journal of geodesy, vol 86 n° 8 (August 2012)PermalinkOptimal regularization for geopotential model GOCO02S by Monte Carlo methods and multi-scale representation of density anomalies / Karl Rudolf Koch in Journal of geodesy, vol 86 n° 8 (August 2012)PermalinkThe spherical Slepian basis as a means to obtain spectral consistency between mean sea level and the geoid / D. Slobbe in Journal of geodesy, vol 86 n° 8 (August 2012)PermalinkBasic equations for constructing geopotential models from the gravitational potential derivatives of the first and second orders in the terrestrial reference frame / M. Petrovskaya in Journal of geodesy, vol 86 n° 7 (July 2012)PermalinkSeparation of global time-variable gravity signals into maximally independent components / E. Forootan in Journal of geodesy, vol 86 n° 7 (July 2012)Permalink"Yu laid out the lands": georeferencing the Chinese Yujitu (Map of the Tracks of Yu) of 1136 / A. Akin in Cartography and Geographic Information Science, vol 39 n° 3 (July 2012)PermalinkAnalysis of 4 years (2002-2005) of laser data on Starlette, Stella and LAGEOS-1/2 satellites for stations coordinates and Earth orientations parameters (EOP) / Bachir Gourine in Bulletin des sciences géographiques, n° 27 (juin 2012)PermalinkAssessment of the GOCE-based global gravity models in Canada / Elmas Sinem Ince in Geomatica, vol 66 n° 2 (June 2012)PermalinkChoix d'un modèle géopotentiel global pour la détermination du géoïde en Algérie / N. Rabehi in Bulletin des sciences géographiques, n° 27 (juin 2012)PermalinkEinsatz der Atominterferometrie in der Geodäsie / M. Schilling in ZFV, Zeitschrift für Geodäsie, Geoinformation und Landmanagement, vol 137 n° 3 (01/06/2012)PermalinkEstimation of the zero-height geopotential level WoLVD in a local vertical datum from inversion of co-located GPS, leveling and geoid heights: a case study in the Hellenic islands / Christopher Kotsakis in Journal of geodesy, vol 86 n° 6 (June 2012)PermalinkOn the detectability of synthetic disturbances in FG5 absolute gravimetry data using lomb-scargle analysis / M. Orlob in Geomatica, vol 66 n° 2 (June 2012)PermalinkThe effect of using inconsistent ocean tidal loading models on GPS coordinate solutions / Y. Fu in Journal of geodesy, vol 86 n° 6 (June 2012)PermalinkWavelet‐based directional analysis of the gravity field : evidence for large‐scale undulations / M. Hayn in Geophysical journal international, vol 189 n° 3 (June 2012)PermalinkEstimating geoid height change in North America: past, present and future / T. Jacob in Journal of geodesy, vol 86 n° 5 (May 2012)PermalinkSimulation study of a follow-on gravity mission to GRACE / B. Loomis in Journal of geodesy, vol 86 n° 5 (May 2012)PermalinkThe US Gravimetric Geoid of 2009 (USGG2009): model development and evaluation / Y. Wang in Journal of geodesy, vol 86 n° 3 (March 2012)PermalinkHigh precision levelling supporting the International Comparison of Absolute Gravimeters / Z. Jiang in Metrologia, vol 49 n° 1 (February 2012)PermalinkRelative gravity measurement campaign during the 8th international comparison of absolute gravimeters (2009) / Z. Jiang in Metrologia, vol 49 n° 1 (February 2012)PermalinkPermalinkPermalinkA dense global velocity field based on GNSS observations: Preliminary Results / Carine Bruyninx (2012)PermalinkDétermination du champ de pesanteur par gradiométrie spatiale [diaporama] / Gwendoline Pajot-Métivier (2012)PermalinkEntwicklung eines Kalman-Filters zur Bestimmung kurzzeitiger Variationen des Erdschwerefeldes aus daten der Satellitenmission GRACE / E. Kurtenbach (2012)PermalinkFlexible dataset combination and modelling by domain decomposition approaches / Isabelle Panet (2012)PermalinkPermalinkModèles de mouvement des plaques tectoniques : Le cas de l’ITRF2008 [diaporama] / Zuheir Altamimi (2012)PermalinkOcean Loading in Brittany, Northwest France: Impact of the GPS Analysis Strategy / Joëlle Nicolas (2012)PermalinkCorrection 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)PermalinkGOCE gravitational gradients along the orbit / Johannes Bouman in Journal of geodesy, vol 85 n° 11 (November /2011)PermalinkMission design, operation and exploitation of the gravity field and steady-state ocean circulation explorer mission / R. 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Li in Journal of geodesy, vol 85 n° 9 (September 2011)PermalinkErratum to “On secular geocenter motion: The impact of climate changes” / Laurent Métivier in Earth and planetary science letters, vol 306 n° 1-2 (June 2011)PermalinkGRACE-derived surface water mass anomalies by energy integral approach: application to continental hydrology / Guillaume Ramillien in Journal of geodesy, vol 85 n° 6 (June 2011)PermalinkPacific 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)PermalinkPermalinkAssessment 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)Permalink