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Geodesic equations and their numerical solutions in geodetic and cartesian coordinates on an oblate spheroid / Georgios Panou in Journal of geodetic science, vol 7 n° 1 (February 2017)  

Public [article]  inJournal of geodetic science > vol 7 n° 1 (February 2017) . - pp 31 - 42 Titre : Geodesic equations and their numerical solutions in geodetic and cartesian coordinates on an oblate spheroid Type de document : Article/Communication Auteurs : Georgios Panou, Auteur ; Romylos Korakitis, Auteur Année de publication : 2017 Article en page(s) : pp 31 - 42 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] coordonnées cartésiennes [Termes IGN] coordonnées géodésiques [Termes IGN] géométrie différentielle [Termes IGN] problème des valeurs limites [Termes IGN] sphèroïde [Termes IGN] système de coordonnées Résumé : (Auteur) The direct geodesic problem on an oblate spheroid is described as an initial value problem and is solved numerically using both geodetic and Cartesian coordinates. The geodesic equations are formulated by means of the theory of differential geometry. The initial value problem under consideration is reduced to a system of first-order ordinary differential equations, which is solved using a numerical method. The solution provides the coordinates and the azimuths at any point along the geodesic. The Clairaut constant is not used for the solution but it is computed, allowing to check the precision of the method. An extensive data set of geodesics is used, in order to evaluate the performance of the method in each coordinate system. The results for the direct geodesic problem are validated by comparison to Karney’s method. We conclude that a complete, stable, precise, accurate and fast solution of the problem in Cartesian coordinates is accomplished. Numéro de notice : A2017-300 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1515/jogs-2017-0004 En ligne : https://doi.org/10.1515/jogs-2017-0004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85335 [article]

Acceleration of the global coastal sea level rise during the 20th century re-evaluated / Huseyin Baki Iz in Journal of geodetic science, vol 7 n° 1 (February 2017)  

Public [article]  inJournal of geodetic science > vol 7 n° 1 (February 2017) . - pp 51 - 58 Titre : Acceleration of the global coastal sea level rise during the 20th century re-evaluated Type de document : Article/Communication Auteurs : Huseyin Baki Iz, Auteur Année de publication : 2017 Article en page(s) : pp 51 - 58 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] autocorrélation [Termes IGN] changement climatique [Termes IGN] données marégraphiques [Termes IGN] montée du niveau de la mer [Termes IGN] niveau de la mer [Termes IGN] niveau moyen des mers Résumé : (Auteur) In contrast to some of the recent investigations, this study shows that far less number of tide gauge stations experienced statistically significant accelerations in sea level rise during the 20th century. Twenty-seven tide gauge stations with century long data were analyzed for the presence of an acceleration in global sea level rise using a kinematic model inclusive of a secular trend, acceleration, and compounded periodicities with autocorrelated random effects. Eight out of twenty-seven stations revealed statistically significant but slow sea level rise acceleration (p Numéro de notice : A2017-301 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1515/jogs-2017-0006 En ligne : https://doi.org/10.1515/jogs-2017-0006 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85336 [article]