Results 31 to 40 of about 1,948 (180)

Evaluating two numerical methods for developing a local geoid model and a local digital elevation model for the Red Sea Coast, Egypt

Journal of King Saud University: Engineering Sciences, 2023
Global Navigation Satellite System (GNSS) provides ellipsoidal heights, whereas engineering projects need orthometric heights of points. Thus, to take advantage of GNSS in engineering work, the relation between orthometric and ellipsoid height must be ...
Hamdy M. Ahmed, Elshewy A. Mohamed, Shaheen A. Bahaa   +2 more
doaj   +1 more source

Assessments of recently released global geopotential models along the Red Sea with shipborne gravity data

Egyptian Journal of Remote Sensing and Space Sciences, 2022
The goal of this research is to assess the accuracy of the global geopotential models (GGMs) from 2018 until the present in the Red Sea. The assessment was done by using the gravitational spectral analysis of models with each other and with the ...
Mohamed Abdallah, Rasha Abd El Ghany, Mostafa Rabah, Ahmed Zaki   +3 more
doaj   +1 more source

Circulation characteristics in three eddy-permitting models of the North Atlantic [PDF]

, 2001
A systematic intercomparison of three realistic eddy-permitting models of the North Atlantic circulation has been performed. The models use different concepts for the discretization of the vertical coordinate, namely geopotential levels, isopycnal layers,
Killworth, P. D., New, A. L., Le Provost, Christian, LeProvost, C., Böning, Claus, Dieterich, Christian, Killworth, P., Willebrand, J., New, A.L., Killworth, Peter D., Böning, Carmen, Claus Böning, Barnier, Bernard, Bernard Barnier, Barnier, B., Jürgen Willebrand, Willebrand, Jürgen, Christian Dieterich, Peter D Killworth, Böning, Claus W., Yanli Jia, Yia, J., Jia, Y., New, Adrian L., Jia, Yanli, Dieterich, C., Jean-Marc Molines, Christian Le Provost, Le Provost, C., Molines, J.-M., Adrian L New, Molines, Jean-Marc   +31 more
core   +1 more source

Estimation of GRACE-like geopotential models [PDF]

, 2018
The availability of time-dependent global gravity field models like EIGEN-6C or EIGEN-6C2 allows the generation of GRACE-like geopotential Earth models.
Abd-Elmotaal, Hussein A.
core   +2 more sources

An Assessment of Recently Released High-Degree Global Geopotential Models Based on Heterogeneous Geodetic and Ocean Data

Frontiers in Earth Science, 2021
The development of the global geopotential model (GGM) broadens its applications in ocean science, which emphasizes the importance for model assessment.
Yihao Wu, Xiufeng He, Zhicai Luo, Hongkai Shi   +3 more
doaj   +1 more source

Assessments of recent Global Geopotential Models based on GPS/levelling and gravity data along coastal zones of Egypt

Open Geosciences, 2023
The orthometric height has an essential role in a variety of civil engineering projects and it is defined as the length of the curved plumbline from a point (on the earth surface) to its intersection with the geoid surface. Leveling process is considered
Al Shouny Ahmed, Khalil Ragab, Kamel Abdullah, Miky Yehia   +3 more
doaj   +1 more source

EVALUATION AND TAILORING OF GLOBAL GEOPOTENTIAL MODELS IN THE DETERMINATION OF GRAVITY FIELD IN SERBIA

STEPGRAD XIV (2020), 2019
<p>Within this paper, we evaluated the quality of three Global Geopotential Models entitled: EGM96,EGM2008, and GOCO05c. The models were evaluated by using 1001 terrestrial discrete values ofheight anomalies determined by Global Navigation Satellite Systems and normal heights, which weconsidered to be true values within this research.
Odalović, Oleg, Joksimović, Danilo, Petković, Dušan, Stanković, Marko, Grekulović, Sanja   +4 more
openaire   +3 more sources

Evaluating the performance of various models for deriving orthometricheights using Global Navigation Satellite System (GNSS) data

Nova Geodesia
Orthometric heights are vital for fields such as topographic mapping, construction, engineering, and geophysical studies. This study examines the performance of five Global Geopotential Models (GGMs) and Global Navigation Satellite System (GNSS) data in
Herbert TATA, Clementina Ajibola OLAOYE
doaj   +1 more source

A regional Stokes-Helmert geoid determination for Costa Rica (GCR-RSH-2020): computation and evaluation

Contributions to Geophysics and Geodesy, 2020
GNSS observations are a common solution for outdoor positioning around the world for coarse and precise applications. However, GNSS produces geodetic heights, which are not physically meaningful, limiting their functionality in many engineering ...
Jaime GARBANZO-LEÓN, Alonso VEGA FERNÁNDEZ, Mauricio VARELA SÁNCHEZ, Juan Picado SALVATIERRA, Robert W. KINGDON, Oscar H. LÜCKE   +5 more
doaj   +1 more source

A Shallow-water Model Exploration of Atmospheric Circulation on Sub-Neptunes: Effects of Radiative Forcing and Rotation Period

The Planetary Science Journal, 2023
Sub-Neptune-type exoplanets are abundant in our Galaxy yet have no solar system analogs. They exist in a broad range of stellar forcing and rotational regimes that are distinctly different from solar system planets and more commonly studied hot Jupiters.
Ekaterina Landgren, Alice Nadeau, Nikole Lewis, Tiffany Kataria, Peter Hitchcock   +4 more
doaj   +1 more source