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Article
Geochemistry & Geophysics
Hartmut Wziontek et al.
Summary: The International Association of Geodesy has developed a system to achieve accurate, homogeneous, long-term global recording of Earth's gravity. This system is defined by the instantaneous acceleration of free-fall and a set of conventional corrections, with the traceability ensured through measurements and comparisons with absolute gravimeters.
JOURNAL OF GEODESY
(2021)
Article
Geochemistry & Geophysics
Derek van Westrum et al.
Summary: In the rugged terrain of southern Colorado, USA, the NGS conducted its final Geoid Slope Validation Survey in the summer of 2017. The data collected revealed significant improvements in height consistency between spirit leveling and deflection of the vertical along the 360 km line, as well as more accurate quantification of various geoid models' accuracy.
JOURNAL OF GEODESY
(2021)
Article
Geochemistry & Geophysics
Yan Ming Wang et al.
Summary: The primary objective of the 1-cm geoid experiment in Colorado (USA) is to compare different geoid computation methods around the world, aiming to achieve a 1-cm accuracy. The experiment shows that the quasigeoid can be computed with an accuracy of around 2 cm in Colorado's rugged terrain.
JOURNAL OF GEODESY
(2021)
Article
Geochemistry & Geophysics
Tonis Oja et al.
Summary: The establishment of a national gravity standard is a high priority for the Estonian geodetic, geophysical, and metrological community, based on international metrological standards. Absolute gravity (AG) data was collected and reprocessed to estimate the rates of secular gravity change, with observed gravity rates differing from GNSS station velocities. The discrepancies were within uncertainties, with corrections made based on international comparisons and regional analysis.
JOURNAL OF GEODESY
(2021)
Article
Geochemistry & Geophysics
Laura Sanchez et al.
Summary: IHRS is a global height reference system defined by the International Association of Geodesy, aiming to provide an international standard for precise determination of physical coordinates worldwide. Efforts are focused on the establishment of the International Height Reference Frame (IHRF), considering methods for physical coordinates determination, standards and conventions for consistency, criteria for reference network design, and operational infrastructure for sustainability. Evaluation of various approaches for accuracy assessment and determination of IHRF coordinates is key in defining a strategy for the establishment of IHRF.
JOURNAL OF GEODESY
(2021)
Article
Geochemistry & Geophysics
Vojtech Palinkas et al.
Summary: This paper demonstrates and discusses the important aspects that significantly influence the estimated parameters of absolute gravimeters, providing a background for future analysis. The application of correlations between measurements of a particular gravimeter for the first time in metrology shows the ability to obtain appropriate uncertainty estimates. The method of processing and the published results will be particularly useful in the realization of the International Gravity Reference System.
JOURNAL OF GEODESY
(2021)
Article
Geochemistry & Geophysics
Mirjam Bilker-Koivula et al.
Summary: The study analyzed the trends of gravity change at 12 stations in Finland using absolute gravity data collected between 1976 and 2019 with different instrument types. It was found that trends stabilized within 15 to 20 years for combined JILAg-5 and FG5-type instruments, and within 10 years for FG5-type instrument data alone. The ratio between gravity change rates and vertical rates in the region was larger than previous estimates.
JOURNAL OF GEODESY
(2021)
Article
Geochemistry & Geophysics
Vassilios N. Grigoriadis et al.
Summary: This study discusses the comparison of different geoid modeling methods and techniques in Colorado, USA, using terrestrial and airborne gravity datasets along with GPS/leveling data. The results show that a final accuracy of 5-7 cm for the determined geoid models was achieved, depending on the adopted method and data combination, without considering the accuracy of the GPS/leveling data used for their evaluation.
JOURNAL OF GEODESY
(2021)
Article
Geochemistry & Geophysics
Matej Varga et al.
Summary: This study investigates the contribution of airborne gravity data to improving gravimetric geoid modelling in the mountainous area of Colorado, USA. By combining airborne and terrestrial gravity data, the accuracy of the geoid models was significantly enhanced compared to using terrestrial data alone. Spectral analysis also revealed specific wavelength bands in which airborne gravity data contributed to improved power spectrum.
JOURNAL OF GEODESY
(2021)
Article
Geochemistry & Geophysics
Mustafa Serkan Isik et al.
Summary: The Colorado geoid experiment, initiated by the IAG JWG 2.2.2 in 2017, aimed to clarify the repeatability of gravity potential values obtained from different geoid determination methods using the same input dataset. By modeling the geoid using modified Stokes and Hotine integral formulas based on terrestrial, airborne, and combined gravity datasets, the experiment found that the accuracy of the geoid models using combined data was higher than those using terrestrial-only and airborne-only solutions.
JOURNAL OF GEODESY
(2021)
Article
Geochemistry & Geophysics
Jaakko Makinen
Summary: IHRS is an international height reference system that introduces the mean-tide concept and defines the reference level by an equipotential surface, with W-0 representing a conventional value. The analysis of tidal aspects of the reference level based on W-0 leads to a proposal of simplified definition for transforming between IHRF geopotential numbers. The consideration of consistent estimates and the importance of tide-free coordinates in geopotential modelling are also highlighted.
JOURNAL OF GEODESY
(2021)
Article
Geosciences, Multidisciplinary
Mirko Reguzzoni et al.
Summary: The International Service for the Geoid (ISG) provides free access to a comprehensive repository of geoid models, including both the latest and less known versions. It is an official service of the International Association of Geodesy (IAG) responsible for collecting, analyzing, and redistributing geoid models.
EARTH SYSTEM SCIENCE DATA
(2021)
Article
Geochemistry & Geophysics
S. J. Claessens et al.
JOURNAL OF GEODESY
(2020)
Article
Geochemistry & Geophysics
Hans-Georg Scherneck et al.
JOURNAL OF GEODESY
(2020)
Article
Geochemistry & Geophysics
Ezequiel D. Antokoletz et al.
JOURNAL OF GEODESY
(2020)
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Geochemistry & Geophysics
Martin Willberg et al.
JOURNAL OF GEODESY
(2020)
Article
Geochemistry & Geophysics
Qing Liu et al.
JOURNAL OF GEODESY
(2020)
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Geochemistry & Geophysics
Yan Ming Wang et al.
JOURNAL OF GEODESY
(2020)
Article
Geochemistry & Geophysics
Manuel Schilling et al.
JOURNAL OF GEODESY
(2020)
Article
Geochemistry & Geophysics
Laura Sanchez et al.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2017)
Review
Geochemistry & Geophysics
Johannes Ihde et al.
SURVEYS IN GEOPHYSICS
(2017)
Article
Geochemistry & Geophysics
L. Sanchez et al.
JOURNAL OF GEODESY
(2016)
Article
Geochemistry & Geophysics
Hermann Drewes et al.
JOURNAL OF GEODESY
(2016)
