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GOCE's measurements of the gravity field and beyond / R. Floberghaben in ESA bulletin, n° 133 (February 2008)
[article]
Titre : GOCE's measurements of the gravity field and beyond Type de document : Article/Communication Auteurs : R. Floberghaben, Auteur ; M. Drinkwater, Auteur ; Roger Haagmans, Auteur ; M. Kern, Auteur Année de publication : 2008 Article en page(s) : pp 24 - 31 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] circulation océanique
[Termes IGN] GOCE
[Termes IGN] gradient de gravitation
[Termes IGN] levé gravimétrique
[Termes IGN] niveau moyen des mersRésumé : (Auteur) Ocean circulation, sea level rise and the ocean's role as a regulator of climate are just some of the critical phenomena that can be further studied with the help of GOCE's gravity field products. But how do the spacecraft's measurements become part of this new information source? Copyright European Space Agency Numéro de notice : A2008-125 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans En ligne : http://www.esa.int/esapub/bulletin/bulletin133/bul133d_floberghagen.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29120
in ESA bulletin > n° 133 (February 2008) . - pp 24 - 31[article]
Titre : Modelling the vertical gravity gradient for gravity measurements reduction Type de document : Article/Communication Auteurs : Henri Duquenne (1948-2010) , Auteur Editeur : [s.l.] : [s.n.] Année de publication : 2007 Conférence : IGFS 2006, 1st International Symposium of the International Gravity Field Service 28/08/2006 01/09/2006 Istanbul Turquie OA proceedings Importance : pp 381 - 385 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] anomalie de pesanteur
[Termes IGN] France (administrative)
[Termes IGN] gradient de gravitation
[Termes IGN] réseau gravimétrique localRésumé : (auteur) When establishing the gravity network, precise values of the vertical gravity gradient are needed to reduce measurements at the level of benchmarks. As the determination of the gradient is timeconsuming and expensive, this article presents the first effort of modelling it within the scope of the new French gravity network. Some existing mathematical models based upon derivation of geoid undulation or gravity anomalies integration are listed and commented. Variants using terrain information are also tested. Gradients measured and modelled by several methods are compared, leading to a standard deviation of the differences of 14.5×10−8 s−2 (145 E) with the best method. Numéro de notice : C2006-040 Affiliation des auteurs : LAREG (1991-2011) Thématique : POSITIONNEMENT Nature : Communication DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102797 Documents numériques
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Modelling the vertical gravity gradient ... - pdf éditeurAdobe Acrobat PDF Modelling and Inversion of High Precision Gravity Data / E. Lewi (1997)
Titre : Modelling and Inversion of High Precision Gravity Data Type de document : Thèse/HDR Auteurs : E. Lewi, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1997 Collection : DGK - C Sous-collection : Dissertationen num. 471 Importance : 145 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9511-3 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] anomalie de pesanteur
[Termes IGN] champ de pesanteur local
[Termes IGN] Darmstadt
[Termes IGN] gradient de gravitation
[Termes IGN] levé gravimétrique
[Termes IGN] lissage de données
[Termes IGN] matrice
[Termes IGN] problème inverse
[Termes IGN] tour (bâtiment)Index. décimale : 30.42 Gravimétrie Résumé : (Auteur) In this work, the scope of the present day gravity data acquisition, processing and interpretational technique in using weak signal gravity anomalies, to study mass distributions, has been tested. To carry out this test, measurements were taken in Darmstadt and Bremen. The study in these areas, that encompasses the different stages of gravity data measurement, analysis and modelling procedures, has led to the development of some new methods and algorithms. The survey in Darmstadt was aimed at recovering the shape, location and density of two Rain Water Reservoirs, from measured gravity data. On the other hand the survey in Bremen was aimed at computing the vertical component of the gravity gradient within the "Drop Tower Bremen".
At first, the implementation of a spectral analysis technique in choosing a sampling interval that avoided aliasing effects was discussed and demonstrated, using the data in the Darmstadt survey area. The simulation of data, for this analysis, was partially carried out using an algorithm that can compute the gravitational attraction of cylindrically shaped bodies. This algorithm, which has reduced the well-known problem in computing the gravitational attraction of vertical cylinders on points that lie outside the axis of symmetry, is developed based on an existing theoretical relationship. The effectiveness of this algorithm was also tested in modelling the effect of the different steal and concrete structures in the "Drop Tower Bremen". Besides this, the need to apply a modified terrain correction procedure for data measured at a certain height above the surface of the ground has been shown.
One of the major findings of this study, is the development of a trend analysis method that makes use of the polynomial fitting technique. This technique is advantageous in its capability to suppress the role of the residual in determining the trend surface. Especially its capability to incorporate a priori information about the trend surface enables the modelling procedure to focus on the trend surface only. In addition, the method estimates the densities for the Bouguer and terrain reductions in an environment where all other effects, other than the elevation dependant term, are modelled using different polynomial terms. In conjunction with this, the role of anomalous gradient effect in gravity data interpretation has been discussed and its effect in the Darmstadt survey area has been analysed.
The other major finding of the present study is the development of a three-dimensional gravity inversion technique. This method makes use of diagonal weighting matrices to reduce the need for large computer memory and to save large computational time. Besides this, the use of a priori information together with a regularization method that depends on the misfit between the measured and model data iteratively, leads to the desired stable solution. Based on this three-dimensional gravity inversion method, a software which can be used for different applications has been developed. The test made on simulated data and the field gravity data, in the Darmstadt survey area, showed the effectiveness of the method both in error-free and error contaminated data. The test made on error-free data, simulated by simple shape three-dimensional models, particularly showed the capability of the method in recovering the causative body using a minimal amount of a priori information. The inversion of measured gravity data taken from the Darmstadt survey area showed not only the effectiveness of the inversion method but also the ability of the present day gravity data interpretation technique in analysing weak signal gravity anomalies.
The comparison of the upward continued gravity data and that measured at different heights of the "Drop Tower Bremen" confirmed the validity of Newton's inverse square law, within the accuracy of the survey. Moreover, through the use of this comparison between the measured and analytically continued gravity data, the vertical component of the gravity gradient has been computed with high accuracy. In general, the study in both the Darmstadt and Bremen survey areas showed that the gravity method, if effectively used, can serve as a tool in locating mass distributions, even if these masses generate only weak signal gravity anomalies.Numéro de notice : 28023 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63370 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 28023-01 30.42 Livre Centre de documentation Géodésie Disponible 28023-02 30.42 Livre Centre de documentation Géodésie Disponible Regionale Gravitationsfeldbestimmung mit zukünftigen Satellitenmissionen (SST und Gradiometrie) / M. Thalhammer (1995)
Titre : Regionale Gravitationsfeldbestimmung mit zukünftigen Satellitenmissionen (SST und Gradiometrie) Titre original : [Détermination régionale du champ gravitationnel avec différentes missions satellitaires (SST et gradiométrie)] Type de document : Thèse/HDR Auteurs : M. Thalhammer, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1995 Collection : DGK - C Sous-collection : Dissertationen num. 437 Importance : 96 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9480-2 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] champ de pesanteur local
[Termes IGN] force de gravitation
[Termes IGN] gradient de gravitation
[Termes IGN] gradiométrie
[Termes IGN] méthode des moindres carrés
[Termes IGN] poursuite de satelliteIndex. décimale : 30.40 Géodésie physique Numéro de notice : 28052 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63399 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 28052-01 30.40 Livre Centre de documentation Géodésie Disponible 28052-02 30.40 Livre Centre de documentation Géodésie Disponible FGI studies on satellite gravity gradiometry, 2. 2 Geopotential recovery at 0.5-degree resolution from global satellite gradiometry data sets / Martin Vermeer (1990)
Titre de série : FGI studies on satellite gravity gradiometry, 2 Titre : 2 Geopotential recovery at 0.5-degree resolution from global satellite gradiometry data sets Type de document : Rapport Auteurs : Martin Vermeer, Auteur Editeur : Helsinki : Finnish Geodetic Institute FGI Année de publication : 1990 Collection : Reports of the Finnish Geodetic Institute num. 90-1 Importance : 28 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-951-711-132-4 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] anomalie de pesanteur
[Termes IGN] géoïde terrestre
[Termes IGN] gradient de gravitation
[Termes IGN] gradiométrie
[Termes IGN] harmonique sphérique
[Termes IGN] potentiel de pesanteur terrestreIndex. décimale : 30.40 Géodésie physique Numéro de notice : 38248B Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=57547 Voir aussi
- FGI studies on satellite gravity gradiometry, 1. 1 Experiments with a 5-degree buried masses grid representation / Martin Vermeer (1989)
- FGI studies on satellite gravity gradiometry, 3. 3 Regional high resolution geopotential recovery in geographical coordinates using a Taylor expansion FFT technique / Martin Vermeer (1992)
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Code-barres Cote Support Localisation Section Disponibilité 38248-01B 30.40 Livre Centre de documentation Géodésie Disponible 38248-02B 30.40 Livre Centre de documentation Géodésie Disponible FGI studies on satellite gravity gradiometry, 1. 1 Experiments with a 5-degree buried masses grid representation / Martin Vermeer (1989)PermalinkUntersuchungen zur terrestrischen Schweregradiometrie / Günter W. Hein (1981)PermalinkAbschätzung der Leistungsfähigkeit von gradiometerunterstützten inertialen Navigationssystemen / E. Doukakis (1979)PermalinkZur lokalen Geoidbestimmung aus terrestrischen Messungen vertikaler Schweregradienten / B. Heck (1979)PermalinkDie Berechnung von anomalen vertikalen Schweregradienten hoher Präzision / Günter W. Hein (1977)PermalinkGravity gradients at satellite altitudes / B.H. Chovitz (1973)PermalinkLokale gravimetrische Bestimmung von Schwere-Horizontalableitungen / H. Wolf (1972)PermalinkComputation of the vertical gradient of gravity for two dimensional bodies / M.K. Paul in Pure and applied geophysics, vol 85 n° 2 (December 1971)PermalinkPoursuite des satellites par satellite / F. Nouel (1970)PermalinkMessungen von Vertikalgradienten der Schwerkraft mit einem Askania-Gravimeter und geodätische Auswertung der Ergebnisse / K. Hilbert (1967)Permalink