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Local effects of redundant terrestrial and GPS-based tie vectors in ITRF-like combinations / Claudio Abbondanza in Journal of geodesy, vol 83 n° 11 (November 2009)  

Public [article]  inJournal of geodesy > vol 83 n° 11 (November 2009) . - pp 1031 - 1040 Titre : Local effects of redundant terrestrial and GPS-based tie vectors in ITRF-like combinations Type de document : Article/Communication Auteurs : Claudio Abbondanza, Auteur ; Zuheir Altamimi , Auteur ; Pierguido Sarti, Auteur ; Monia Negusini, Auteur ; Luca Vittuari, Auteur Année de publication : 2009 Article en page(s) : pp 1031 - 1040 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] analyse comparative [Termes IGN] géodésie terrestre [Termes IGN] interférométrie à très grande base [Termes IGN] International Terrestrial Reference Frame [Termes IGN] point de liaison (géodésie) [Termes IGN] positionnement par GPS [Termes IGN] système de référence mondial Résumé : (Auteur) Tie vectors (TVs) between co-located space geodetic instruments are essential for combining terrestrial reference frames (TRFs) realised using different techniques. They provide relative positioning between instrumental reference points (RPs) which are part of a global geodetic network such as the international terrestrial reference frame (ITRF). This paper gathers the set of very long baseline interferometry (VLBI)–global positioning system (GPS) local ties performed at the observatory of Medicina (Northern Italy) during the years 2001–2006 and discusses some important aspects related to the usage of co-location ties in the combinations of TRFs. Two measurement approaches of local survey are considered here: a GPS-based approach and a classical approach based on terrestrial observations (i.e. angles, distances and height differences). The behaviour of terrestrial local ties, which routinely join combinations of space geodetic solutions, is compared to that of GPS-based local ties. In particular, we have performed and analysed different combinations of satellite laser ranging (SLR), VLBI and GPS long term solutions in order to (i) evaluate the local effects of the insertion of the series of TVs computed at Medicina, (ii) investigate the consistency of GPS-based TVs with respect to space geodetic solutions, (iii) discuss the effects of an imprecise alignment of TVs from a local to a global reference frame. Results of ITRF-like combinations show that terrestrial TVs originate the smallest residuals in all the three components. In most cases, GPS-based TVs fit space geodetic solutions very well, especially in the horizontal components (N, E). On the contrary, the estimation of the VLBI RP Up component through GPS technique appears to be awkward, since the corresponding post fit residuals are considerably larger. Besides, combination tests including multi-temporal TVs display local effects of residual redistribution, when compared to those solutions where Medicina TVs are added one at a time. Finally, the combination of TRFs turns out to be sensitive to the orientation of the local tie into the global frame. Copyright Springer Numéro de notice : A2009-476 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-009-0321-6 En ligne : https://doi.org/10.1007/s00190-009-0321-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30105 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
266-09101	SL	Revue	Centre de documentation	Revues en salle	Disponible

Improving resolution and accuracy of mean sea surface from kinematic GPS, Vanuatu subduction zone / Marie-Noëlle Bouin in Journal of geodesy, vol 83 n° 11 (November 2009)  

Public [article]  inJournal of geodesy > vol 83 n° 11 (November 2009) . - pp 1017 - 1030 Titre : Improving resolution and accuracy of mean sea surface from kinematic GPS, Vanuatu subduction zone Type de document : Article/Communication Auteurs : Marie-Noëlle Bouin , Auteur ; Valérie Ballu, Auteur ; Stéphane Calmant, Auteur ; Bernard Pelletier, Auteur Année de publication : 2009 Article en page(s) : pp 1017 - 1030 Note générale : biblographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] géoïde local [Termes IGN] GPS en mode cinématique [Termes IGN] surface de la mer [Termes IGN] Vanuatu Résumé : (auteur) Satellite altimetry provides an ocean mean sea surface (MSS) map with global coverage and overall excellent precision. However, in some areas, like the Vanuatu archipelago, the coverage and resolution of this tool are not sufficient to correctly map the short scale undulations of the sea surface, due to numerous islands and to strong lithospheric and mantle heterogeneities. New applications such as seafloor geodesy may require local mean surface representation with improved resolution in specific areas. We used sea surface height collected with kinematic GPS during three different cruises in 2004, 2006 and 2007 to reconstruct a homogeneous sea surface map around Santo Island, Vanuatu. We assess the accuracy of this GPS-derived local sea surface to 6–19 cm and evaluate the quality of existing altimetry and gravity-derived MSSs on the Vanuatu archipelago. Observed short scale undulations are interpreted as due to local geodynamics. Numéro de notice : A2009-582 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-009-0320-7 En ligne : https://doi.org/10.1007/s00190-009-0320-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=88651 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
266-09101	SL	Revue	Centre de documentation	Revues en salle	Disponible

Local effects of redundant terrestrial and GPS-based tie vectors in ITRF-like combinations / Claudio Abbondanza in Journal of geodesy, vol 83 n° 11 (November 2009)  

Public [article]  inJournal of geodesy > vol 83 n° 11 (November 2009) . - pp 1031 - 1040 Titre : Local effects of redundant terrestrial and GPS-based tie vectors in ITRF-like combinations Type de document : Article/Communication Auteurs : Claudio Abbondanza, Auteur ; Zuheir Altamimi , Auteur ; Pierguido Sarti, Auteur ; Monia Negusini, Auteur ; Luca Vittuari, Auteur Année de publication : 2009 Article en page(s) : pp 1031 - 1040 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] co-positionnement [Termes IGN] interférométrie à très grande base [Termes IGN] International Terrestrial Reference Frame [Termes IGN] point de liaison (géodésie) [Termes IGN] positionnement par GPS Résumé : (auteur) Tie vectors (TVs) between co-located space geodetic instruments are essential for combining terrestrial reference frames (TRFs) realised using different techniques. They provide relative positioning between instrumental reference points (RPs) which are part of a global geodetic network such as the international terrestrial reference frame (ITRF). This paper gathers the set of very long baseline interferometry (VLBI)–global positioning system (GPS) local ties performed at the observatory of Medicina (Northern Italy) during the years 2001–2006 and discusses some important aspects related to the usage of co-location ties in the combinations of TRFs. Two measurement approaches of local survey are considered here: a GPS-based approach and a classical approach based on terrestrial observations (i.e. angles, distances and height differences). The behaviour of terrestrial local ties, which routinely join combinations of space geodetic solutions, is compared to that of GPS-based local ties. In particular, we have performed and analysed different combinations of satellite laser ranging (SLR), VLBI and GPS long term solutions in order to (i) evaluate the local effects of the insertion of the series of TVs computed at Medicina, (ii) investigate the consistency of GPS-based TVs with respect to space geodetic solutions, (iii) discuss the effects of an imprecise alignment of TVs from a local to a global reference frame. Results of ITRF-like combinations show that terrestrial TVs originate the smallest residuals in all the three components. In most cases, GPS-based TVs fit space geodetic solutions very well, especially in the horizontal components (N, E). On the contrary, the estimation of the VLBI RP Up component through GPS technique appears to be awkward, since the corresponding post fit residuals are considerably larger. Besides, combination tests including multi-temporal TVs display local effects of residual redistribution, when compared to those solutions where Medicina TVs are added one at a time. Finally, the combination of TRFs turns out to be sensitive to the orientation of the local tie into the global frame. Numéro de notice : A2009-583 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-009-0321-6 En ligne : https://doi.org/10.1007/s00190-009-0321-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=88652 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
266-09101	SL	Revue	Centre de documentation	Revues en salle	Disponible