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Recent Activities on Tristan da Cunha Island: Geodetic Installations, Local Tie Measurements and their Analysis
Teferle, Felix Norman; Hunegnaw, Addisu; Backes, Dietmar et al.
201927th IUGG General Assembly
 

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Keywords :
Global Navigation Satellite System; Tide Gauge; Sea Level; Terrestrial Reference Frame; DORIS; Geodetic Tie Measurement; Least Squares Adjustment
Abstract :
[en] During 2017 a team from the University of Luxembourg and the National Oceanography Centre, Liverpool, established a permanent Global Navigation Satellite System (GNSS) station and two new tide gauges on Tristan da Cunha Island in the South Atlantic Ocean. These installations were funded through various projects at both collaborating institutions under the umbrella of the International GNSS Service (IGS) Tide Gauge Benchmark Monitoring (TIGA) Working Group and the Global Geodetic Observing System (GGOS) focus area on Sea Level Change, Variability and Forecasting. While this was the first scientific installation of a GNSS station on the main island within the Tristan da Cunha archipelago, IGS station GOUG, located on Gough Island which lies 412 km to the south, has been in operation since 1998. Unfortunately GOUG was decommissioned in 2018. Sea level observations on Tristan da Cunha have a longer history than GNSS with various tide gauges having been in operation since 1984. Tristan da Cunha also hosts a Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) station which was established in 2012 after a previous installation was upgraded and moved to the current site. The antenna TCTA is located on the concrete monument of the previous DORIS antenna. Furthermore, in order for future International Terrestrial Reference Frame (ITRF) computations to fully benefit from the proximity of the sensors, the geodetic ties between the respective antennas (and reference markers in case of the tide gauges) need to be determined at the millimeter level using various terrestrial surveying methods and a local benchmark network. This contribution provides details of the activities on Tristan da Cunha including the installations, the established benchmark network, the terrestrial surveys of the geodetic ties and the analysis of these measurements in order to geometrically link the GNSS and DORIS antennas to each other as well as to the tide gauges.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Teferle, Felix Norman ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Hunegnaw, Addisu  ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Backes, Dietmar ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Hibbert, Angela;  National Oceanography Centre
Williams, Simon D. P.;  National Oceanography Centre
Woodworth, Philip L.;  National Oceanography Centre
Pugh, Jeffrey P.;  National Oceanography Centre
External co-authors :
yes
Language :
English
Title :
Recent Activities on Tristan da Cunha Island: Geodetic Installations, Local Tie Measurements and their Analysis
Publication date :
11 July 2019
Number of pages :
31
Event name :
27th IUGG General Assembly
Event organizer :
International Union of Geodesy and Geophysics
Event place :
Montréal, Canada
Event date :
8-7-2019 to 18-7-2019
Audience :
International
Focus Area :
Computational Sciences
Name of the research project :
R-AGR-0376 - IRP15 - SGSL (20150501-20170430) - TEFERLE Felix Norman
Funders :
University of Luxembourg - UL
Available on ORBilu :
since 24 July 2019

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