Results 41 to 50 of about 20,151 (197)
Geoid undulation computations at laser tracking stations [PDF]
Bulletin Géodésique, 1989 The accuracy of numerical computations of gravimetric undulations using recently proposed modifications of the classical Stokes formula is investigated. The basic formulations of the methods are outlined, and results from trial computations are presented in tables and graphs and compared with actual gravity data and/or GEOS-3/Seasat sea-surface heights.
openaire +1 more source
The recent progress using high-precision terrestrial gravity measurements
地球与行星物理论评, 2022 Compare with the airborne and satellite-borne gravity measurements, terrestrial gravity measurements (TGMs) are closer to the sources of mass change and have relatively higher accuracy. The static anomalies and dynamic changes derived from TGMs have been
Jiancheng Han +7 more
doaj +1 more source
IOP Conference Series: Earth and Environment, 2023 The main purpose of this study is to compute a new gravimetric geoid model for Sudan by using the least-square collocation technique (LSC method) and applying the remove-compute-restore (RCR) technique.
Anas Osman, I. M. Anjasmara
semanticscholar +1 more source
Global geoid adjustment on local area for GIS applications using GNSS permanent station coordinates
Geodesy and Cartography, 2018 Orthometric heights, useful for many engineering and geoscience applications, can be obtained by GPS (Global Positioning System) surveys only when an accurate geoid undulation model (that supplies the vertical separation between the geoid and WGS84 ...
Ugo Falchi +2 more
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Hybrid Geoid Model: Theory and Application in Brazil
Anais da Academia Brasileira de CiênciasDetermination of the ellipsoidal height by Global Navigation Satellite Systems (GNSS) is becoming better known and used for purposes of leveling with the aid of geoid models.
DANIEL ARANA +2 more
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Assessment of hybrid geoids in Chile and Spain, combining GGM and GNSS/Leveling observations
Geodesy and Geodynamics, 2021 This research presents the results for analyses done to five geopotential global models (GGM), comparing them with ground data from GNSS and leveling in heterogenic zones from the geodetic perspective, in Chile and Spain.
José Antonio Tarrío Mosquera +3 more
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Reduction of geodetic observations to the reference ellipsoid
Vojnotehnički Glasnik, 2011 Field observations refer to the vertical of the geoid, because the geodetic instruments are put in the working position in respect to the vertical. It is not appropriate for the calculations on the ellipsoid surface, which request measured elements to be
Stevan M. Radojčić
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Journal of Advances in Modeling Earth Systems, Volume 17, Issue 12, December 2025.Abstract For over 60 years, an approximation involving spherical geopotentials has underlain the representation of gravity in global numerical models of Earth's atmosphere and oceans. This article explores how departures from sphericity can be allowed by assuming spheroidal geopotentials instead. A route to more accurate model formulation is indicated,
Andrew Staniforth, Andy White
wiley +1 more source
Calving Mechanisms Inferred From Observations of Surface Depressions at Helheim Glacier, Greenland
Journal of Geophysical Research: Earth Surface, Volume 130, Issue 10, October 2025.Abstract Dynamical changes at the termini of tidewater glaciers may trigger sustained acceleration, thinning, and retreat, increasing a glacier's contribution to sea level rise. However, processes at the ice‐ocean interface occur across a range of spatial (cm to km) and temporal (minutes to years) scales, making these processes difficult to capture ...
Michael G. Shahin +7 more
wiley +1 more source
Geochemistry, Geophysics, Geosystems, Volume 26, Issue 10, October 2025.Abstract Eastern North America has hosted significant historical earthquakes, where seismicity clusters along tectonically inherited structures. Using the spherical finite‐element code CitcomSVE and fully 3D viscosity structure, we model the intraplate stress response to glacial isostatic adjustment (GIA) using ICE‐6G, both with and without low ...
Erin Hightower, Michael Gurnis
wiley +1 more source