Results 21 to 30 of about 6,478 (164)

Study on the stable and high-precision downward extension method of airborne gravity anomaly data

地球与行星物理论评
The essence of the downward continuation of airborne gravity anomalies is to solve the first kind of Fredholm integral equation, which is an ill-posed problem. Stable and high-precision downward continuation methods have always been a research hotspot in
Baogui Ke, Yufei Zhao, Fanfan Xu, Cui Zhao, Taihang Li   +4 more
doaj   +1 more source

Application of the normalized largest eigenvalue of structure tensor in the interpretation of potential field tensor data

Earth, Planets and Space, 2020
Obtaining horizontal edges and the buried depths of geological bodies, using potential field tensor data directly is an outstanding question. The largest eigenvalue of the structure tensor is one of the commonly used edge detectors for delineating the ...
Yuan Yuan, Xiangyu Zhang, Wenna Zhou, Guochao Wu, Weidong Luo   +4 more
doaj   +1 more source

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

Downward Continuation Method for Potential Field Data Based on Physics-Informed Neural Network

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Downward continuation can enhance weak anomaly signals and enable the conversion of data from different altitudes, making it a crucial technique in potential field data processing.
Yongkang Chan, Wenna Zhou, Bohu Xu, Qiang Li, Yunmeng Wu, Zhongkun Qiao   +5 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

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

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

On the topographic bias by harmonic continuation of the geopotential for a spherical sea-level approximation

Journal of Geodetic Science
Topography is a problem in geoid determination by the Stokes formula, a high degree Earth Gravitational Model (EGM), or for a combination thereof. Herein, we consider this problem in analytical/harmonic downward continuation of the external potential at ...
Sjöberg Lars E.
doaj   +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