Results 41 to 50 of about 1,547 (182)
MARINE GEOID UNDULATION ASSESSMENT OVER SOUTH CHINA SEA USING GLOBAL GEOPOTENTIAL MODELS AND AIRBORNE GRAVITY DATA [PDF]
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2016 Global geopotential models (GGMs) are vital in computing global geoid undulations heights. Based on the ellipsoidal height by Global Navigation Satellite System (GNSS) observations, the accurate orthometric height can be calculated by adding precise and ...
N. M. Yazid +6 more
doaj +1 more source
Geoid model determination for the Hellenic area “Hellas Geoid 2023”
Acta Geodaetica et Geophysica, 2023 AbstractThe latest geoid model "HELLAS GEOID 2023" (HG2023) derived by the Hellenic Military Geographical Service is the most comprehensive model for the entire Hellenic area. Long-term gravity data, orthometric and geometric heights, seabed topography and a high-resolution digital terrain model were implemented in the calculations. Data evaluation and
Melissinos Paraskevas +2 more
openaire +1 more source
Lithospheric Rheology in Southern California Derived From Novel Observations of Lake Unloading
Journal of Geophysical Research: Solid Earth, Volume 131, Issue 8, August 2026.Abstract Recent Lake Cahuilla has undergone repeated filling and drying cycles over the past millennium, resulting in lithospheric and mantle loading responses. Two critical but less well‐constrained factors influencing these responses are the elastic plate thickness and mantle relaxation time.
R. Thicklin +4 more
wiley +1 more source
Near-zone Direct and Indirect Topographic Effects Based on the Rectangular Prism and Surface Element [PDF]
Journal of Geodesy and Geoinformation Science, 2019 Helmert’s second method of condensation is an effective method for terrain reduction in the geoid and quasi-geoid determinations. Condensing the masses outside the geoid to a surface layer on the geoid produces several forms of topographic effects ...
Jian MA,Ziqing WEI,Zhenghui YANG,Xiaogang LIU,Jianfeng JI
doaj +1 more source
Tectonics, Volume 45, Issue 8, August 2026.Abstract Rayleigh‐Taylor instabilities within the upper mantle are investigated as a mechanism for the uplift of rift‐margin mountain ranges within the continents. Our focus is on the Transantarctic Mountains (TAM). These mountains form at the margin between East and West Antarctica and have been free from the effects of subduction for about 500 ...
Tim Stern +3 more
wiley +1 more source
ETH-GQS: An estimation of geoid-to-quasigeoid separation over Ethiopia
Geodesy and Geodynamics, 2022 The determination of accurate orthometric or normal heights remains one of the main challenges for the geodetic community in Ethiopia. These heights are required for geodetic and geodynamic scientific research as well as for extensive engineering ...
Ephrem Y. Belay +3 more
doaj +1 more source
JAWRA Journal of the American Water Resources Association, Volume 62, Issue 4, August 2026.ABSTRACT This study demonstrates that flow resistance in rivers, quantified via calibration of a modified Manning's equation, can inform its estimation from channel hydrometric information available from regional or global datasets for a limited set (N = 14) of rigorously calibrated river reaches in Alaska and with less certainty in a large set (N ...
David M. Bjerklie +6 more
wiley +1 more source
FITTING OF A TRANSFORMATION GEOID MODEL TO THE GRAVIMETRIC-GEOMETRIC GEOID MODEL OF BENIN CITY
FUDMA JOURNAL OF SCIENCES, 2022 The application of the transformation geoid model in Benin City has necessitated its fitting to the existing gravimetric-geometric geoid model of the study area. The transformation geoid model was determined using the Kotsakis (2008) model for the transformation of global geoid heights to local geoidal undulations. To obtain its accuracy, the root mean
Oduyebo, O. F., Ono, M. N., Eteje, S. O.
openaire +2 more sources
Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.Abstract The NASA/CNES Surface Water and Ocean Topography (SWOT) swath‐mapping radar altimetry satellite mission, launched in December 2022, provides repeat‐track coverage to about ±78.2° latitude every 21 days, sampling many of Antarctica's most dynamic ice shelves that play key roles in constraining mass loss from the grounded ice sheet ...
S. L. Howard +5 more
wiley +1 more source
Assessing Dynamical Contributions to SWOT Sea Surface Height in an Internal Tide Hotspot
Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.Abstract The Surface Water and Ocean Topography (SWOT) mission has revealed high‐frequency sea surface height anomaly (SSHA) variability associated with internal gravity waves, yet comparison with in situ observations remains limited. Here, we analyze a mooring array beneath the swaths of SWOT Cal/Val south of New Caledonia, an internal tide (IT ...
Arne Bendinger +4 more
wiley +1 more source