Results 71 to 80 of about 742 (185)

Geoidal correction methods for GPS geodetics measurements (Geoidal correction)

Revista Técnica de la Facultad de Ingeniería, 2011
This work analyzes the problem of fixing GPS ellipsoidal heights by geoidal undulation effects. It studies some correction models that some institutes use for that purpose, here in Venezuela; testing them on a previously selected test network.
Luis Franco, Melvin Hoyer
doaj  

Extraction of geoid heights from shipborne GNSS measurements along the Weser River in northern Germany

Journal of Geodetic Science, 2015
In-land geoid models rely on several measuring techniques. The quality of those models is directly related to the spatial resolution of the measurement data.
Lavrov D., Even-Tzur G., Reinking J.
doaj   +1 more source

Methodology for local correction of the heights of global geoid models to improve the accuracy of GNSS leveling

Geodesy and Geodynamics
At present, one of the methods used to determine the height of points on the Earth's surface is Global Navigation Satellite System (GNSS) leveling. It is possible to determine the orthometric or normal height by this method only if there is a geoid or ...
Stepan Savchuk, Alina Fedorchuk
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

Determination of orthometric elevations using gnss-derived height with the egm2008 geoid height model

International Journal of Advanced Geosciences, 2017
The Global navigation satellite systems (GNSS) has imparted positively on civilian positioning & surveying in the horizontal component in Nigeria for the past two decades. The GNSS receivers’ data are longitude, latitude & elevation. However, the vertical distance measurement have not been fully exploited by geodetic and land surveyors.
openaire   +2 more sources

On the Consistency between a Classical Definition of the Geoid-to-Quasigeoid Separation and Helmert Orthometric Heights. [PDF]

Sensors (Basel), 2023
Tenzer R, Nsiah Ababio A.
europepmc   +1 more source

An Oceanographer's Guide to GOCE and the Geoid [PDF]

Ocean Science, 2008
A review is given of the geodetic concepts necessary for oceanographers to make use of satellite gravity data to define the geoid, and to interpret the resulting product.
C. W. Hughes, R. J. Bingham
doaj  

Consistent determination of the gravimetric geoid and orthometric height

Journal of Geodesy
Abstract Various computational methods have been developed and applied to determine regional gravimetric geoid models with high accuracy using surface gravity and terrain data, while also often taking into consideration topographic mass density information.
Robert Tenzer, Pavel Novák
openaire   +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

Enhancing geoid modelling for accurate local geoid determination in Lagos Island: A combined GNSS and levelling approach, Eti-Osa Local Government Area, Lagos State, Nigeria

Contributions to Geophysics and Geodesy
Lagos Island faces challenges from coastal hazards and inadequate infrastructure, making precise geoid modelling essential for urban planning, flood risk assessment, and infrastructure development.
Herbert TATA, Olamilekan Babatunde OMODEJO   +1 more
doaj   +1 more source