Results 61 to 70 of about 226 (172)

On quality of NKG2015 geoid model over the Nordic countries

Journal of Geodetic Science, 2019
The NKG2015 geoid model covers the Nordic and Baltic countries and has been computed based on the least-squares modification of Stokes’ formula with additive corrections method. New and precise terrestrial, airborne and shipborne gravimetric measurements,
Eshagh Mehdi, Berntsson Jenny
doaj   +1 more source

Towards the Selection of an Optimal Global Geopotential Model for the Computation of the Long-Wavelength Contribution: A Case Study of Ghana

Geosciences, 2017
The selection of a global geopotential model (GGM) for modeling the long-wavelength for geoid computation is imperative not only because of the plethora of GGMs available but more importantly because it influences the accuracy of a geoid model.
Caleb Iddissah Yakubu, Vagner Gonçalves Ferreira, Cosmas Yaw Asante   +2 more
doaj   +1 more source

Combination of Soviet-Era Surface Gravity and Modern Satellite Data for Geoid Model Computation: A Case Study for Kazakhstan

Computation
Accurate geoid determination is essential for height system unification and for converting Global Navigation Satellite System (GNSS) ellipsoidal heights to orthometric heights.
Daniya Shoganbekova, Asset Urazaliyev, Serik Nurakynov, Magzhan Kozhakhmetov, Nailya Zhaksygul, Roman Sermiagin   +5 more
doaj   +1 more source

Methodology for optimizing heights in the Amsterdam system based on regional and global geoid/quasi-geoid models

Geodesy and Geodynamics
The article presents a methodology for transitioning to the Amsterdam height system based on utilizing global and regional geoid/quasi-geoid models. The study was conducted for the Polish-Ukrainian cross-border sector and expanded to the entire territory
Alina Fedorchuk, Bohdan Dzhuman, Mykhailo Forostyna   +2 more
doaj   +1 more source

Detailed Gravimetric Geoid for the United States [PDF]

, 2013
A detailed gravimetric geoid was computed for the United States using a combination of satellite-derived spherical harmonic coefficients and 1 by 1 deg mean gravity values from surface gravimetry. Comparisons of this geoid with astrogeodetic geoid data indicate that a precision of plus or minus 2 meters has been obtained. Translations only were used to
William E. Strange, Samir F. Vincent, Richard H. Berry, James G. Marsh   +3 more
openaire   +1 more source

The topographic bias in gravimetric geoid determination revisited

Journal of Geodetic Science, 2019
The topographic potential bias at geoid level is the error of the analytically continued geopotential from or above the Earth’s surface to the geoid.
Sjöberg Lars E.
doaj   +1 more source

A Regional Gravimetric and Hybrid Geoid Model in Northern Greece from Dedicated Gravity Campaigns

Remote Sensing
The determination of physical heights is of key importance for a wide spectrum of geoscientific applications and, in particular, for engineering projects.
Georgios S. Vergos, Dimitrios A. Natsiopoulos, Elisavet G. Mamagiannou, Eleni A. Tzanou, Anastasia I. Triantafyllou, Ilias N. Tziavos, Dimitrios Ramnalis, Vassilios Polychronos   +7 more
doaj   +1 more source

Geoid profiles in the Baltic sea determined using GPS and sea level surface

Geodesy and Cartography, 2012
The idea was to compare the geoid in sea areas by an independent method, like GPS levelling, on the mainland. On the earth surface we can compare the gravimetric geoid with GPS levelling to get an accuracy estimation and tilt information.
Harli Jürgenson, Aive Liibusk, Artu Ellmann   +2 more
doaj   +1 more source

Determination and evaluation of the Estonian fitted geoid model EST-GEOID 2003 / Estijos geoido modelio Est-Geoid 2003 sudarymas ir vertinimas / Создание и оценка модели геоида Эстонии Est-Geoid2003

Geodesy and Cartography, 2011
This paper focuses on issues related to the calculation of a high-precision fitted geoid model on Estonian territory. Model Est-Geoid2003 have been used in Estonia several years in geodesy and other applications.
Harli Jürgenson, Kristina Türk, Jüri Randjärv   +2 more
doaj   +1 more source

Gravity field modelling and gravimetry

Geodesy and Cartography, 2015
The summary of research activities concerning gravity field modelling and gravimetric works performed in Poland in the period of 2011-2014 is presented.
Krynski Jan
doaj   +1 more source