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Devising stable geometrical reference frames for use in geodetic studies of vertical crustal motion / Michael Bevis in Journal of geodesy, vol 87 n° 4 (April 2013)  

Public [article]  inJournal of geodesy > vol 87 n° 4 (April 2013) . - pp 311 - 321 Titre : Devising stable geometrical reference frames for use in geodetic studies of vertical crustal motion Type de document : Article/Communication Auteurs : Michael Bevis, Auteur ; Abel Brown, Auteur ; Eric Kendrick, Auteur Année de publication : 2013 Article en page(s) : pp 311 - 321 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] déformation verticale de la croute terrestre [Termes IGN] positionnement par GPS [Termes IGN] repère de référence Résumé : (Auteur) We present a method for constructing and assessing the stability of a geometrical reference frame for use in vertical crustal motion studies. Our approach exploits the fact that when we transform GPS velocity solutions from one reference frame (RF) to another one using a Helmert transformation, only the frame translation rate parameters produce significant changes in the vertical station velocities expressed in the final RF. Loosely speaking, one can select and impose a ‘vertical RF’ from an ensemble of candidate frames, without any reference to the ‘horizontal RF’ (which can be selected and imposed afterwards), by seeing how the frame translation rates vary as one moves across the ensemble of frames. We order this ensemble according to the number of stations, N, incorporated into the set VREF whose RMS vertical motion is minimized in order to realize each frame. The value of N controls the level of scatter in, and hence the degree of similarity between the vertical velocities of the stations composing VREF. We characterize a specific vertical RF as stable if all of the frames located in a large neighborhood of the ensemble which includes the specific frame are characterized by very small relative frame translation rates. In this case, the expression of vertical GPS station velocities in any of these frames would lead to very similar results. We present a case study using a very large global time series in which we find a large RF neighborhood in which vertical station velocities are globally stable at the ? 0.2 mm/year level, and a slightly smaller neighborhood in which vertical stability improves to ? 0.1 mm/year level in polar regions. Numéro de notice : A2013-216 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-012-0600-5 Date de publication en ligne : 03/11/2012 En ligne : https://doi.org/10.1007/s00190-012-0600-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32354 [article]

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