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Auteur W. Daxinger |
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Titre : Astrogravimetrische Geoidbestimmung für Ingenieurprojekte Titre original : [Détermination du géoïde astrogravimétrique pour les projets d'ingénieur] Type de document : Monographie Auteurs : W. Daxinger, Auteur Editeur : Vienne [Autriche] : Technische Universität Wien Année de publication : 1996 Collection : Geowissenschaftliche Mitteilungen, ISSN 1811-8380 num. 45 Importance : 121 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] alpes orientales
[Termes IGN] geoïde astro-géodésique
[Termes IGN] géoïde gravimétrique
[Termes IGN] Tyrol (Autriche)Index. décimale : 30.41 Géoïde Résumé : (Auteur) In this treatise, a suitable model for local gravity determination for the purpose of field surveyors is presented. This model is based upon modified astrogravimetric levelling, allowing the use of gravity anomaly data limited to a certain area and an arbitrary distribution of the observations used (gravity values and deflections of the vertical). The mathematical and physical background of the reduction methods is investigated for completeness and extended if necessary. In this way, a close connection of the datum of a geodetic network to the datum of the geoid is revealed. The interdependence results from the astronomic coordinates referring to the axis of the global geocentric coordinate system. Furthermore the influence of the convergence of the plumb lines, of the atmospheric masses and the vertical gradient of the gravity anomaly are analysed; the use of numerical integration for calculating the terrain effect is discussed. Because of the topographic-isostatic reduction and the use of surface density information smooth gravity anomalies with small amplitudes are received. Thereby a modification of the classical astrogravimetric leveling becomes possible, a minimal range of the anomalies does not cause worse interpolation results. In order to avoid edge effects the astrogeodetic deflections of the vertical have to be extended beyond the original territory of interest. The numerical experiments were carried out in the Tyrolian Alps. Despite of the rough topography an accuracy of ± 1.8 mgal (1.8. 10-5 ms-2) for the interpolation of gravity anomalies and ± 0.4” for the deflection components is achieved. For the relative geoidal heights a standard error of ± 13 mm/10 km is obtained. Numéro de notice : 55639 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=59893 Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 55639-01 30.41 Livre Centre de documentation Géodésie Disponible