Results 11 to 20 of about 159,970 (226)

Estimation of Geopotential Value W₀ for the Geoid and Local Vertical Datum Parameters

Remote Sensing, 2023
Unification of the global vertical datum has been a key problem to be solved for geodesy over a long period, and the main challenge for unifying the global vertical datum system is to determine the geopotential value W0 of the geoid and to calculate the ...
Xinyu Liu, Shanshan Li, Jiajia Yuan, Diao Fan, Xuli Tan   +4 more
doaj   +1 more source

Determination of the geopotential value on the permanent GNSS stations in Vietnam based on the Geodetic Boundary Value Problem approach

, 2021
In the realisation of the International Height Reference System, the determination of the geopotential value and its variations in time plays an important role.
D. T. Vu, S. Bruinsma, S. Bonvalot, L. Bui, G. Balmino   +4 more
semanticscholar   +1 more source

Global Geopotential Models assessment in Ecuador based on geoid heights and geopotential values

Journal of Geodetic Science, 2023
Since the 1960s, the analysis of disturbed satellite orbits to infer Earth’s gravity field functionals has been an important element in determining the Earth’s gravitational field. The long wavelengths of the gravitational field are recovered through the
Carrión José, Flores Fredy, Rodríguez Freddy, Pozo Miguel   +3 more
doaj   +1 more source

Evolutionary dynamics on a regular networked structured and unstructured multi‐population

International Journal of Robust and Nonlinear Control, EarlyView., 2023
Abstract In this paper, we study collective decision‐making in a multi‐population framework, where groups of individuals represent whole populations that interact by means of a regular network. Each group consists of a number of players and every player can choose between two options.
Wouter Baar, Leonardo Stella, Dario Bauso   +2 more
wiley   +1 more source

The sand grain and the butterfly. Instability in geodesy and geophysics

Annals of Geophysics, 1997
The problems of convergence of series in celestial mechanics and of certain series in geodesy (Molodensky's series and spherical harmonics) show similar features, involving a curious instability. This is imaginatively expressed as the « butterfly effect»
H. Moritz
doaj   +1 more source

A study on geodetic boundary value problems in ellipsoidal geometry [PDF]

, 2021
Στην παρούσα διατριβή, ειδικά γεωδαιτικά προβλήματα αντιμετωπίζονται ωςπροβλήματα συνοριακών τιμών. Το γεωδαισιακό πρόβλημα, το πεδίο βαρύτητας πουπαράγεται από ένα ομογενές ελλειψοειδές και το γραμμικό δεσμευμένο αλτιμετρικό-βαρυτημετρικό πρόβλημα μελετώνται πλήρως σε ελλειψοειδή γεωμετρία.
openaire   +1 more source

Global Gravity Field Modelling by Solving the Infinite Nonlinear Fixed Geodetic Boundary Value Problem

Tatra Mountains Mathematical Publications
The aim of presented paper is to solve the nonlinear geodetic boundary value problem (BVP) by the finite element method (FEM) involving the mapped infinite elements (MIE). In comparison to our previous works, see [ Macák, M.
M. Macák, Z. Minarechová, R. Čunderlík, Karol Mikula   +3 more
semanticscholar   +1 more source

Approximations of the GOCE error variance-covariance matrix for least-squares estimation of height datum offsets

Journal of Geodetic Science, 2012
One main geodetic objective of the European Space Agency’s satellite mission GOCE (gravity field and steady-state ocean circulation explorer) is the contribution to global height system unification.
Gerlach Ch., Fecher Th.
doaj   +1 more source

Calculation of a quasi-geoid model based on the scalar-free solution of the Geodetic Boundary Value Problem (GBVP) with numerical integration of Stokes integrals within the Colorado Experiment

Boletim de Ciências Geodésicas
: This paper presents the approach proposed by UFPR for calculating a quasi-geoid model within the Colorado Experiment (CE) based on the scalar-free solution of the Geodetic Boundary Value Problem (GBVP), using Molodensky series and numerical solutions ...
T. Padilha, Salomão Soares, Mariana Eiko Borba Inoue, Antonio Carlos França Cagido, T. Rodrigues, Christian Gonzalo Pilapanta Amagua   +5 more
semanticscholar   +1 more source

Overcoming the Phase Discontinuity Problem in RIS Optimization: A Robust and Scalable Phase‐Aware Deep Regression Framework via Hybrid CNN–LSTM Architecture

Advanced Intelligent Systems, EarlyView.
The phase discontinuity problem—where the cyclic nature of phase angles causes catastrophic errors near the ±π boundary—is a fundamental obstacle in learning‐based reconfigurable intelligent surface (RIS) optimization. A phase‐aware hybrid CNN–LSTM framework resolves this by decomposing phase predictions into sine–cosine components, mapping circular ...
Seda Savaşçı Şen, Ali Çalhan, Murtaza Cicioğlu, Oğuzhan Demiryürek   +3 more
wiley   +1 more source