Results 31 to 40 of about 6,954 (297)

Downward Continuation of Airborne Gravimetry Data by Means of Spherical Radial Basis Functions

Russian Journal of Earth Sciences, 2022
The problem of downward continuation of airborne gravimetry data is discussed. Use of spherical radial basis functions (SRBF) to solve this ill-posed problem is proposed. Gravity disturbances observed at flight high are continued downward to disturbing
Sugaipova Leyla, Neyman Yury
doaj   +1 more source

GOCE Downward Continuation to the Earth’s Surface and Improvements to Local Geoid Modeling by FFT and LSC

Remote Sensing, 2023
One of the main applications of the gravity field and steady-state Ocean Circulation Explorer (GOCE) satellite data is their combination with local gravity anomalies for geoid and gravity field modeling purposes.
Dimitrios A. Natsiopoulos, Elisavet G. Mamagiannou, Eleftherios A. Pitenis, Georgios S. Vergos, Ilias N. Tziavos   +4 more
doaj   +1 more source

Upward and downward continuation as inverse problems [PDF]

Geophysical Journal International, 1979
Summary. The formalism of Backus & Gilbert is applied to the problems of upward and downward continuation of harmonic functions. We first treat downward continuation of a two-dimensional field to a level surface everywhere below the observation locations; the calculation of resolving widths and solution estimates is a straightforward application of ...
Huestis, Stephen P., Parker, Robert L.
openaire   +2 more sources

Characterization and stabilization of the downward continuation problem for airborne gravity data

, 2022
In this study, we compare six commonly used methods for the downward continuation of airborne gravity data. We consider exact and noisy simulated data on grids and along flight trajectories and real data from the GRAV-D airborne campaign.
Willberg, M. (author), Klees, R., Slobbe, D. C., Willberg, M., Pail, R., Forsberg, R. (author), Slobbe, D.C. (author), Li, X., Forsberg, R., Hwang, C. (author), Klees, R. (author), Hwang, C., Li, X. (author), Pail, R. (author), Huang, J., Huang, J. (author)   +15 more
core   +1 more source

On the convergence of spherical harmonic expansion of topographic and atmospheric biases in gradiometry

Contributions to Geophysics and Geodesy, 2009
The  gravity  gradiometric data  are  affected by  the  topographic and  atmospheric  masses.  In order  to fulfill  Laplace-Poisson’s equation and  to simplify  the  downward  continuation process, these effects should be removed from the data. However, if
Mehdi ESHAGH
doaj   +1 more source

Downward Continuation of Potential Fields within the Quasi-harmonicRegion

, 2010
Downward continuation is a useful transformation, mainly used to enhance the measured field. Known limitations regard its instability and are theoretical, because the continuation level should not be deeper than the source depth. Despite of this downward
Giovanni Florio, FEDI, MAURIZIO, Maurizio Fedi, FLORIO, GIOVANNI   +3 more
core   +1 more source

Real‐World Safety and Effectiveness of JAK Inhibitors in Systemic Sclerosis: A Propensity‐Matched Study from the EUSTAR Cohort

Arthritis Care &Research, Accepted Article.
Objective JAK inhibitors (JAKis) have shown promising effects in early‐phase studies of SSc. We aimed to assess the safety and explore effectiveness of JAKis compared to conventional immunosuppressants in SSc. Methods A longitudinal retrospective study of the EUSTAR cohort was performed.
Stefano Di Donato, Marie‐Elise Truchetet, Marco Minerba, Oliver Distler, Juan José Alegre Sancho, Yolanda Braun‐Moscovici, Christina Bergmann, Petros Sfikakis, Jeska K de Vries‐Bouwstra, Murray Baron, Silvia Bellando‐Randone, Lorenzo Dagna, Christopher P Denton, Madelon C Vonk, Vanessa Smith, Ivan Castellvi, Gabriela Riemekasten, Andra Balanescu, Masataka Kuwana, Maria De Santis, Kamal Solanki, Anastas Batalov, Vahan Mukuchyan, Marco Matucci‐Cerinic, Yannick Allanore, Francesco Del Galdo, Michael Hughes, EUSTAR Collaborators   +27 more
wiley   +1 more source

A U-Net network-based downward continuation method for airborne gravity

Geo-spatial Information Science
Downward continuation of gravity data is a critical challenge in the practical applications of airborne gravity, such as global geopotential modeling and geophysical interpretation.
Zifan Ding, Jiancheng Li, Xinyu Xu, Hui Wei   +3 more
doaj   +1 more source

Bathymetry Estimation Using the Gravity-Geologic Method: An Investigation of Density Contrast Predicted by the Downward Continuation Method

Terrestrial, Atmospheric and Oceanic Sciences, 2011
The downward continuation (DWC) method was used to determine the density contrast between the seawater and the ocean bottom topographic mass to estimate accurate bathymetry using the gravity-geologic method (GGM) in two study areas, which are located ...
Yu-Shen Hsiao, Jeong Woo Kim, Kwang Bae Kim, Bang Yong Lee, Cheinway Hwang   +4 more
doaj   +1 more source

A Regularization Method for Downward Continuation of Potential Fields

, 2011
Instability is the inherent limitation of downward continuation. Based on integral iteration idea and regularization theory, a regularization method is proposed for downward continuation of potential fields.
Tao Ma, Mei Ping Wu, Xiao Ping Hu, Guan Nan Li   +3 more
core   +1 more source