Results 1 to 10 of about 173 (112)
A New Model of Quasigeoid for the Baltic Sea Area [PDF]
Remote Sensing, 2021 The Space Research Centre in Warsaw is participating in the ESA project “Geodetic SAR for Height System Unification and Sea Level Research”. To observe the absolute sea level and enable the unification of the height systems, the physical heights of the ...
Jolanta Nastula +2 more
exaly +4 more sources
Determination of the Geoid–Quasigeoid Separation Using GGI Method
Remote SensingThe determination of the geoid–quasigeoid separation (GQS) is most often based on the use of Bouguer gravity anomalies or disturbances with additional corrections, which allow for the determination of so-called complete or accurate GQS values. This study
Marek Trojanowicz +2 more
exaly +4 more sources
On the Consistency between a Classical Definition of the Geoid-to-Quasigeoid Separation and Helmert Orthometric Heights [PDF]
Sensors, 2023 It is acknowledged that a classical definition of the geoid-to-quasigeoid separation as a function of the simple planar Bouguer gravity anomaly is compatible with Helmert’s definition of orthometric heights.
Robert Tenzer, Albertini Nsiah Ababio
doaj +2 more sources
ON THE COMPUTATION OF A PRECISE GEOID – TO – QUASIGEOID SEPARATION [PDF]
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2017 In geodesy, orthometric and normal heights are considered as basic height systems on the earth. The reference surfaces for these heights are the geoid and quasigeoid respectively.
S. Hejrati, M. Najafi-Alamdari
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The Use of Quasigeoid in Leveling Through Terrain Obstacles [PDF]
Reports on Geodesy and Geoinformatics, 2017 In these paper are presented two ways of performing leveling through terrain obstacles. They use properties of the quasigeoid course with respect to the ellipsoid within a given area.
Banasik Piotr, Bujakowski Kazimierz
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On the geoid and orthometric height vs. quasigeoid and normal height
Journal of Geodetic Science, 2018 The geoid, but not the quasigeoid, is an equipotential surface in the Earth’s gravity field that can serve both as a geodetic datum and a reference surface in geophysics. It is also a natural zero-level surface, as it agrees with the undisturbed mean sea
Lars E Sjoberg
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A high-resolution gravimetric quasigeoid model for Vietnam
Earth, Planets and Space, 2019 A high-resolution gravimetric quasigeoid model for Vietnam and its surrounding areas was determined based on new gravity data. A set of 29,121 land gravity measurements was used in combination with fill-in data where no gravity data existed.
Dinh Toan Vu +2 more
doaj +4 more sources
Remote Sensing, 2020 A vertical offset model for Vietnam and its surrounding areas was determined based on the differences between height anomalies derived from 779 Global Navigation Satellite System (GNSS)/levelling points and those derived from a dedicated high-resolution ...
Sylvain Bonvalot +2 more
exaly +3 more sources
The geoid or quasigeoid – which reference surface should be preferred for a national height system?
Journal of Geodetic Science, 2013 Most European states use M. S. Molodensky’s concept of normal heights for their height systems with a quasigeoid model as the reference surface, while the rest of the world rely on orthometric heights with the geoid as the zero-level.
L E Sjoberg
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Quasigeoid computation in the Nordic and Baltic region [PDF]
Journal of Geodetic ScienceAbstract The Nordic and Baltic Sea region is topographically varied, making gravity potential field modelling in the region a challenge. With new gravity data in and around the Baltic Sea, this study investigates improvements in the accuracy of quasigeoid determination in the region.
Teitsson Hergeir +3 more
doaj +2 more sources