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Deformation detection through the realization of reference frames / Nestoras Papadopoulos in Journal of applied geodesy, vol 14 n° 2 (April 2020)  

Public [article]  inJournal of applied geodesy > vol 14 n° 2 (April 2020) . - pp 133 – 148 Titre : Deformation detection through the realization of reference frames Type de document : Article/Communication Auteurs : Nestoras Papadopoulos, Auteur ; Melissinos Paraskevas, Auteur ; Ioannis Katsafados, Auteur ; et al., Auteur Année de publication : 2020 Article en page(s) : pp 133 – 148 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] déformation de la croute terrestre [Termes IGN] détection de changement [Termes IGN] géodynamique [Termes IGN] Grèce [Termes IGN] Hellenic Military Geographical Service [Termes IGN] modèle de déformation tectonique [Termes IGN] positionnement cinématique [Termes IGN] repère de référence [Termes IGN] réseau de triangulation [Termes IGN] système de référence géodésique Résumé : (auteur) Hellenic Military Geographical Service (HMGS) has established and measured various networks in Greece which constitute the geodetic infrastructure of the country. One of them is the triangulation network consisting of about 26.000 pillars all over Greece. Classical geodetic measurements that held by the Hellenic Military Geographic Service (HMGS) through the years have been used after adjustment for the state reference frame which materializes the current Hellenic Geodetic Reference System of 1987 (HGRS87). The aforementioned Reference System (RS) is a static one and is in use since 1990. Through the years especially in the era of satellite navigation systems many Global Navigation Satellite System (GNSS) networks have been established. The latest such network materialized by HMGS is ongoing and covers until now more than the 2/3 of the country. It is referenced by International GNSS Service (IGS) permanent stations and consists a local densification IGS08 Reference Frame. Firstly, this gives the opportunity to calculate transformation parameters between the two systems and a statistical analysis of the residuals leads to intermediate conclusions. After that and in conjunction with existing past transformations, tectonic deformations and their directions are concluded. Moreover past GPS observations on the same pillars in compare to the newer ones give also a sense of tectonic displacements. Greece is one of the most tectonically active countries in Europe and the adoption of a modern kinematic or semi-kinematic geodetic datum is a necessity as it should incorporate a deformation model like 3d velocities on the reference frame realization. The detection of geodynamic changes is a continuous need and should be taken into consideration at each epoch. Numéro de notice : A2020-215 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1515/jag-2019-0056 Date de publication en ligne : 18/01/2020 En ligne : https://doi.org/10.1515/jag-2019-0056 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=94908 [article]

Assessing a new velocity field in Greece towards a new semi-kinematic datum / S. Bitharis in Survey review, vol 51 n° 368 (September 2019)  

Public [article]  inSurvey review > vol 51 n° 368 (September 2019) . - pp 450 - 459 Titre : Assessing a new velocity field in Greece towards a new semi-kinematic datum Type de document : Article/Communication Auteurs : S. Bitharis, Auteur ; Nestoras Papadopoulos, Auteur ; C. Pikridas, Auteur ; et al., Auteur Année de publication : 2019 Article en page(s) : pp 450 - 459 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] champ de vitesse [Termes IGN] déformation de la croute terrestre [Termes IGN] géodynamique [Termes IGN] Grèce [Termes IGN] réseau géodésique local [Termes IGN] système de référence local Résumé : (Auteur) Greece has always been an interesting study area for the geodesists due to its intense geodynamic behaviour. Especially, the exploitation of a modern geodetic velocity field using GNSS becomes a crucial requirement for geodetic purposes. The main aim of the present study is the assessment of a modern geodetic velocity model. This procedure is based on the unification of various reference frames, implemented from individual extended GNSS campaigns in different epochs with the effective involvement of the Hellenic Military Geographic Service. The implementation of geodetic velocities in the inhomogeneous Greek velocity field improves significantly the reliability of transformations, more than 60% with respect to the horizontal component, applying a vice versa time shift to a common epoch. We also emphasise the necessity to adopt a velocity model in order to process regional GNSS networks and therefore to establish a modern semi-kinematic reference frame in Greece. Numéro de notice : A2019-386 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/00396265.2018.1479937 Date de publication en ligne : 02/06/2018 En ligne : https://doi.org/10.1080/00396265.2018.1479937 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93476 [article]