Détail de l'autorité
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EGS 1995, 20th general assembly European geophysical society 03/04/1995 07/04/1995 Hambourg Allemagne
nom du congrès :
EGS 1995, 20th general assembly European geophysical society
début du congrès :
03/04/1995
fin du congrès :
07/04/1995
ville du congrès :
Hambourg
pays du congrès :
Allemagne
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Documents disponibles (3)
Ajouter le résultat dans votre panier Affiner la recherche Interroger des sources externesFast integration for the integrals of Stokes, potential and terrain correction in geoid determination / Zhiheng Jiang (03/04/1995)
Titre : Fast integration for the integrals of Stokes, potential and terrain correction in geoid determination Type de document : Article/Communication Auteurs : Zhiheng Jiang , Auteur ; Henri Duquenne (1948-2010)
Editeur : Helsinki : Finnish Geodetic Institute FGI Année de publication : 03/04/1995 Conférence : EGS 1995, 20th general assembly European geophysical society 03/04/1995 07/04/1995 Hambourg Allemagne Importance : pp 23 - 31 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] géoïde
[Termes IGN] GravSoft
[Termes IGN] intégrale de Stokes
[Termes IGN] PILI
[Termes IGN] potentiel de pesanteur terrestreRésumé : (Auteur) When applying the theories of Stokes or Molodensky to determine the geoid, we have generally to calculate the three integrals of Stokes, terrain correction and potential. The classical method is to make the numerical integration with the help of geographical grid data. In principle, this gives the best accuracy but, unfortunately meanwhile, consumes enormous CPU time while computation. The authors propose here a new method which is based on the modification of the integrated 3 dimensional functions into the 1 dimensional functions of the spherical distance angle and then using an optimal quadrature' technique. Using the same geographical grid, this method make possible to avoid the special treatments for the improper problem in the central area closed to the computed point and to select the sub-integration intervals according to the requirement of accuracy. There exist several optimal techniques to realise the purpose of speeding up the computation process without losing accuracy. In this paper, the application of the trapezoidal and mid-point rule realised by Romberg method is taken as an example to introduce the authors' idea about the principle of this new method. The results of the first numerical tests are a little surprise: compared with the classical method, the new one consumes only 4% on average of CPU time for the three basic computations of Stokes, potential and terrain correction without losing accuracy. Its accuracy can be given by the standard deviation of the differences between the computed geoid and 62 GPS levelling points in a hilly area in the south of France. The standard deviation is ±3.1 cm. Numéro de notice : C1995-039 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Communication Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=65618
Titre : Optimal fitting of gravity geoid to GPS levelling points Type de document : Article/Communication Auteurs : Zhiheng Jiang Editeur : Helsinki : Finnish Geodetic Institute FGI Année de publication : 03/04/1995 Conférence : EGS 1995, 20th general assembly European geophysical society 03/04/1995 07/04/1995 Hambourg Allemagne Importance : 10 p. ; pp 33 - 42 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] ajustement de paramètres
[Termes IGN] géoïde gravimétrique
[Termes IGN] point de nivellement
[Termes IGN] point GNSS niveléRésumé : (Auteur) Generally, the GPS levelling points are not dense enough to realise a national levelling reference surface in a practical way. A gravity geoid is therefore proposed for the interpolation between the GPS levelling points. However, for the reason of long-wavelength errors, we consider that a gravity geoid does not have any absolute accuracy. Based on the errors' behaviours of both GPS levelling and gravity solutions, a combined adjustment method is proposed and discussed in this paper. The main idea is to cut up the gravity geoid into some smaller pieces and then to fit them locally to the GPS levelling points. Numéro de notice : C1995-040 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Communication Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=65619
Titre : Latest developments in the computation of regional Geoids : Proceedings, session G4, European Geophysical Society XX [20e] general assembly, Hamburg, germany, 3-7 April, 1995 Type de document : Rapport Auteurs : Martin Vermeer, Éditeur scientifique Editeur : Helsinki : Finnish Geodetic Institute FGI Année de publication : 1995 Collection : Reports of the Finnish Geodetic Institute num. 95-7 Conférence : EGS 1995, 20th general assembly European geophysical society 03/04/1995 07/04/1995 Hambourg Allemagne Importance : 77 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-951-711-190-4 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] Estonie
[Termes IGN] géoïde local
[Termes IGN] Italie
[Termes IGN] Méditerranée, mer
[Termes IGN] UkraineNuméro de notice : 69557 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Actes Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=37318 Exemplaires(1)
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