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Entwicklung eines Kalman-Filters zur Bestimmung kurzzeitiger Variationen des Erdschwerefeldes aus daten der Satellitenmission GRACE / E. Kurtenbach (2012)
Titre : Entwicklung eines Kalman-Filters zur Bestimmung kurzzeitiger Variationen des Erdschwerefeldes aus daten der Satellitenmission GRACE Titre original : Development of a Kalman filter to derive short-term variations of the Earth's gravity field from GRACE data Type de document : Thèse/HDR Auteurs : E. Kurtenbach, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2012 Collection : DGK - C Sous-collection : Dissertationen num. 683 Importance : 120 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5095-2 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] corrélation automatique de points homologues
[Termes IGN] crénelage
[Termes IGN] données GRACE
[Termes IGN] filtre de Kalman
[Termes IGN] série temporelle
[Termes IGN] variation temporelleRésumé : (Auteur) The gravitational field and its temporal variations represent an important observable for the monitoring of the Earth's system. The satellite mission GRACE (Gravity Recovery And Climate Experiment) is, for the first time, able to measure gravity field variations with homogeneous global coverage. Nevertheless, the predicted GRACE accuracy has not been reached yet, partly due to the insufficient representation of the temporal variations in terms of monthly mean fields. In this thesis, an approach is presented which allows the calculation of daily GRACE solutions with the goal of modeling short-term gravity field variations. This time series can on the one hand be used to improve the knowledge of the underlying geophysical processes. On the other hand the daily GRACE solutions can also be used to improve the monthly mean fields. Increasing the temporal resolution is accompanied by a loss of accuracy due to insufficient data coverage. Therefore, additional information in terms of temporal and spatial correlations of the expected gravity signal is introduced into the analysis process. The combination of the GRACE observations and the correlation patterns is then performed within a Kalman filter framework. In a simulation study, the performance of the approach at hand is investigated and, in a second step, applied to real GRACE LIB data. Comparisons to independent data sets, i.e. vertical displacements of GPS stations and ocean bottom pressure time series, reveal that the daily GRACE time series contains geophysically interpretable signal. Furthermore, the daily GRACE time series can be used to significantly reduce the effects of temporal aliasing in the processing of monthly mean gravity field solutions. Numéro de notice : 14619 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62670 Documents numériques
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14619_dgk-c-683_kurtenbach.pdfAdobe Acrobat PDF Flexible dataset combination and modelling by domain decomposition approaches / Isabelle Panet (2012)
Titre : Flexible dataset combination and modelling by domain decomposition approaches Type de document : Article/Communication Auteurs : Isabelle Panet , Auteur ; Yuki Kuroishi, Auteur ; Matthias Holschneider, Auteur Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2012 Collection : International Association of Geodesy Symposia, ISSN 0939-9585 num. 137 Projets : 2-Pas d'info accessible - article non ouvert / Conférence : IAG 2009, 7th Hotine-Marussi Symposium on Mathematical Geodesy 06/06/2009 10/06/2009 Rome Italie Proceedings Springer Importance : pp 67 - 73 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] compensation par moindres carrés
[Termes IGN] erreur systématique
[Termes IGN] filtrage du bruit
[Termes IGN] Japon
[Termes IGN] modèle de géopotentiel
[Termes IGN] modèle de géopotentiel local
[Termes IGN] ondelette
[Termes IGN] ondelette d'Abel-Poisson
[Termes IGN] transformation en ondelettesRésumé : (auteur) For geodetic and geophysical purposes, such as geoid determination or the study of the Earth’s structure, heterogeneous gravity datasets of various origins need to be combined over an area of interest, in order to derive a local gravity model at the highest possible resolution. The quality of the obtained gravity model strongly depends on the use of appropriate noise models for the different datasets in the combination process. In addition to random errors, those datasets are indeed often affected by systematic biases and correlated errors. Here we show how wavelets can be used to realize such combination in a flexible and economic way, and how the use of domain decomposition approaches allows to recalibrate the noise models in different wavebands and for different areas. We represent the gravity potential as a linear combination of Poisson multipole wavelets (Holschneider et al. 2003). We compute the wavelet model of the gravity field by regularized least-squares adjustment of the datasets. To solve the normal system, we apply the Schwarz iterative algorithms, based on a domain decomposition of the models space. Hierarchical scale subdomains are defined as subsets of wavelets at different scales, and for each scale, block subdomains are defined based on spatial splittings of the area. In the computation process, the data weights can be refined for each subdomain, allowing to take into account the effect of correlated noises in a simple way. Similarly, the weight of the regularization can be recalibrated for each subdomain, introducing non-stationarity in the a priori assumption of smoothness of the gravity field. We show and discuss examples of application of this method for regional gravity field modelling over a test area in Japan. Numéro de notice : C2009-035 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1007/978-3-642-22078-4_10 Date de publication en ligne : 18/11/2011 En ligne : https://doi.org/10.1007/978-3-642-22078-4_10 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91642 Geodesy / Wolfgang Torge (2012)
Titre : Geodesy Type de document : Guide/Manuel Auteurs : Wolfgang Torge, Auteur ; Jurgen Müller, Auteur Mention d'édition : 4th edition Editeur : Berlin, New York : Walter de Gruyter Année de publication : 2012 Importance : 433 p. Format : 17 x 24 cm ISBN/ISSN/EAN : 978-3-11-020718-7 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie
[Termes IGN] champ de gravitation
[Termes IGN] géodésie spatiale
[Termes IGN] géopositionnement
[Termes IGN] gravimétrie
[Termes IGN] mesure géodésique
[Termes IGN] réseau géodésique
[Termes IGN] système de référence géodésiqueIndex. décimale : 30.00 Géodésie - généralités Résumé : (Auteur) The fourth edition of this textbook has been thoroughly revised in order to reflect the central role which geodesy has achieved in the past ten years. The Global Geodetic Observing System established by the IAG utilizes a variety of techniques to determine the geometric shape of the Earth and its kinematics, the variations of Earth rotation, and the Earth’s gravity field. Space techniques play a fundamental role, with recent space missions also including gravity field recovery. Terrestrial techniques are important for regional and local applications, and for validating the results of the space missions. Global and regional reference systems are now well established and widely used. They also serve as a basis for geo-information systems. The analysis of the time variation of the geodetic products provides the link to other geosciences and contributes to proper modelling of geodynamic processes. The book follows the principal directions of geodesy, providing the theoretical background as well as the principles of measurement and evaluation methods. Selected examples of instruments illustrate the geodetic work. An extensive reference list supports further studies. The book is intended to serve as an introductory textbook for graduate students as well as a reference for scientists and engineers in the fields of geodesy, geophysics, surveying engineering and geomatics Note de contenu : 1 Introduction
1.1 Definition of geodesy
1.2 The objective of geodesy
1.3 Historical development of geodesy
1.4 Organization of geodesy, literature
2 Reference Systems and Reference Frames
2.1 Basic units and constants
2.2 Time systems
2.3 Reference coordinate systems: fundamentals
2.4 International reference systems and reference frames
2.5 Local level systems
3 The Gravity Field of the Earth
3.1 Fundamentals of gravity field theory
3.2 Geometry of the gravity field
3.3 Spherical harmonic expansion of the gravitational potential
3.4 The geoid
3.5 Temporal gravity variations
4 The Geodetic Earth Model
4.1 The rotational ellipsoid
4.2 The normal gravity field
4.3 Geodetic reference systems, optimum Earth model
5 Methods of Measurement
5.1 Atmospheric refraction
5.2 Satellite observations
5.3 Geodetic astronomy
5.4 Gravimetry
5.5 Terrestrial geodetic measurements
6 Methods of Positioning and Gravity Field Modeling
6.1 Residual gravity field
6.2 Three-dimensional positioning
6.3 Horizontal positioning
6.4 Height determination
6.5 Fundamentals of gravity field modeling
6.6 Global gravity field modeling
6.7 Local gravity field modeling
6.8 Least-squares collocation
7 Geodetic and Gravimetric Networks
7.1 Horizontal control networks
7.2 Vertical control networks
7.3 Three-dimensional networks
7.4 Gravity networks
8 Structure and Dynamics of the Earth
8.1 The geophysical Earth model
8.2 The upper layers of the Earth
8.3 Geodesy and recent geodynamicsNuméro de notice : 15799 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Manuel de cours DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=45266 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15799-01 30.00 Livre Centre de documentation Géodésie Disponible Introduction à l’astronomie de position / Jonathan Chenal (2012)
Titre : Introduction à l’astronomie de position : Leçon aux élèves du Mastère de Photogrammétrie, Positionnement et Mesures de Déformations, Option Géodésie le 13 février 2012 à Marne-la-Vallée Type de document : Guide/Manuel Auteurs : Jonathan Chenal , Auteur Editeur : Paris : Institut Géographique National - IGN (1940-2007) Année de publication : 2012 Importance : 227 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Astronomie fondamentale
[Termes IGN] coordonnées sphériques
[Termes IGN] détermination astronomique
[Termes IGN] échelle de temps
[Termes IGN] force de gravitation
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] Lune
[Termes IGN] mouvement du pôle
[Termes IGN] nutation
[Termes IGN] précession
[Termes IGN] repère de référence céleste
[Termes IGN] rotation de la Terre
[Termes IGN] système international de référence céleste
[Termes IGN] système solaire
[Termes IGN] Terre (planète)
[Termes IGN] triangle de position
[Termes IGN] trigonométrie sphériqueNote de contenu : Introduction
1 L'astronomie : l'Homme dans l'Univers
1.1 L'Univers
1.2 La Voie Lactée, une galaxie parmi d'autres
1.3 Le système solaire
1.4 La Terre
2 Les mouvements de la Terre, approche physique
2.1 Un seul moteur, la gravitation
2.2 La révolution autour du Soleil
2.3 Le problème de la Lune
2.4 La rotation diurne
2.5 La précession
2.6 La nutation
2.7 Le mouvement du pôle
2.8 Conséquences visibles des mouvements de la Terre
3 Les échelles de temps
3.1 Définitions
3.2 Les calendriers
3.3 Les échelles de temps scientifiques
4 Les repères spatiaux utilisés en astronomie
4.1 Les systèmes de coordonnées sphériques
4.2 Les repères de référence célestes
4.3 Le repère international de référence terrestre
4.4 L'approche classique de la transformation du repère terrestre au repère céleste
5 L'utilité des astres et de l'astronomie de position
5.1 Trigonométrie sphérique
5.3 L'utilisation d'éphémérides
5.4 La détermination de l'heure
5.5 La détermination de la position
5.6 La détermination d'un azimut par observation du Soleil
ConclusionNuméro de notice : 14448 Affiliation des auteurs : IGN (2012-2019) Thématique : POSITIONNEMENT Nature : Manuel de cours IGN nature-HAL : Cours DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=46393 GOCE gravitational gradients along the orbit / Johannes Bouman in Journal of geodesy, vol 85 n° 11 (November /2011)
[article]
Titre : GOCE gravitational gradients along the orbit Type de document : Article/Communication Auteurs : Johannes Bouman, Auteur ; S. Fiorot, Auteur ; M. Fuchs, Auteur ; Thomas Gruber, Auteur Année de publication : 2011 Article en page(s) : pp 791 - 805 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] GOCE
[Termes IGN] gradient de gravitationRésumé : (Auteur) GOCE is ESA’s gravity field mission and the first satellite ever that measures gravitational gradients in space, that is, the second spatial derivatives of the Earth’s gravitational potential. The goal is to determine the Earth’s mean gravitational field with unprecedented accuracy at spatial resolutions down to 100 km. GOCE carries a gravity gradiometer that allows deriving the gravitational gradients with very high precision to achieve this goal. There are two types of GOCE Level 2 gravitational gradients (GGs) along the orbit: the gravitational gradients in the gradiometer reference frame (GRF) and the gravitational gradients in the local north oriented frame (LNOF) derived from the GGs in the GRF by point-wise rotation. Because the V XX , V YY , V ZZ and V XZ are much more accurate than V XY and V YZ , and because the error of the accurate GGs increases for low frequencies, the rotation requires that part of the measured GG signal is replaced by model signal. However, the actual quality of the gradients in GRF and LNOF needs to be assessed. We analysed the outliers in the GGs, validated the GGs in the GRF using independent gravity field information and compared their assessed error with the requirements. In addition, we compared the GGs in the LNOF with state-of-the-art global gravity field models and determined the model contribution to the rotated GGs. We found that the percentage of detected outliers is below 0.1% for all GGs, and external gravity data confirm that the GG scale factors do not differ from one down to the 10-3 level. Furthermore, we found that the error of V XX and V YY is approximately at the level of the requirement on the gravitational gradient trace, whereas the V ZZ error is a factor of 2–3 above the requirement for higher frequencies. We show that the model contribution in the rotated GGs is 2–35% dependent on the gravitational gradient. Finally, we found that GOCE gravitational gradients and gradients derived from EIGEN-5C and EGM2008 are consistent over the oceans, but that over the continents the consistency may be less, especially in areas with poor terrestrial gravity data. All in all, our analyses show that the quality of the GOCE gravitational gradients is good and that with this type of data valuable new gravity field information is obtained. Numéro de notice : A2011-468 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-011-0464-0 Date de publication en ligne : 18/10/2011 En ligne : https://doi.org/10.1007/s00190-011-0464-0 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31362
in Journal of geodesy > vol 85 n° 11 (November /2011) . - pp 791 - 805[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2011111 RAB Revue Centre de documentation En réserve L003 Disponible vol 85 n° 11 - November /2011 - GOCE - The gravity and steady state-ocean circulation explorer (Bulletin de Journal of geodesy) / International association of geodesyPermalinkMission 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)PermalinkValidation 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)PermalinkSensitivity of superconducting gravimeters in central Europe on variations in regional river and drainage basins / C. Kroner in Journal of geodesy, vol 85 n° 10 (October 2011)PermalinkAlternative method for angular rate determination within the GOCE gradiometer processing / C. Stummer in Journal of geodesy, vol 85 n° 9 (September 2011)PermalinkStrapdown INS/DGPS airborne gravimetry tests in the Gulf of Mexico / X. Li in Journal of geodesy, vol 85 n° 9 (September 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