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On the combined adjustment of a gravimetrically determined geoid and GPS levelling stations / Zhiheng Jiang in Journal of geodesy, vol 70 n° 8 (May 1996)    

Public [article]  inJournal of geodesy > vol 70 n° 8 (May 1996) . - pp 505 - 514 Titre : On the combined adjustment of a gravimetrically determined geoid and GPS levelling stations Type de document : Article/Communication Auteurs : Zhiheng Jiang , Auteur ; Henri Duquenne (1948-2010) , Auteur Année de publication : 1996 Article en page(s) : pp 505 - 514 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] compensation [Termes IGN] géoïde gravimétrique [Termes IGN] nivellement par GPS Résumé : (autuer) A new basic geodetic network using the GPS technique is now being set up in France. There will be altogether 1000 benchmarks connected to the French levelling network. Obviously, the GPS levelling points are not dense enough to produce a national levelling reference surface. A gravimetrically determined geoid has therefore been proposed to be used for the interpolation between the GPS levelling points. However, because of long-wavelength errors, we consider that a gravimetric geoid does not have sufficient accuracy. A regression by fitting the gravimetrically determined geoid to the GPS levelling points is generally proposed. Unfortunately, this country-wide geoid fitting work cannot eliminate local deformations in the geoid, which happen in areas where there are errors or shortages of gravity or DTM data. This paper proposes and discusses a combined adjustment method. The principle is to divide up the geoid into small pieces and then to adjust them to the GPS levelling points locally with constraint conditions for the common points of the adjacent pieces. In order to benefit from the advantages of the high resolution and high relative accuracy of the gravimetric geoid, as well as the high absolute accuracy of the GPS levelling points, we establish respectively a relative observation equation for the difference of the gravimetric geoid undulation and an absolute observation equation for the GPS levelling points. Finally, we adjust the observation equations as a whole. Several global and local systematic errors are also taken into account and some special cases, such as adjustment in groups and blunder detection, are also discussed. Numéro de notice : A1996-018 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/BF00863623 En ligne : http://dx.doi.org/10.1007/BF00863623 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93063 [article]

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266-96052	RAB	Revue	Centre de documentation	En réserve L003	Disponible

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