Showing papers in "Geodesy and Geodynamics in 2020"

TL;DR: In this article, the performance of TEC forecasting models based on Neural Networks (NN) have been evaluated to forecast (1-h ahead) ionospheric TEC over equatorial low latitude Bengaluru (12.97 ∘ N, 77.59 ∘ E ), Global Navigation Satellite System (GNSS) station, India.

TL;DR: Analyses of six-year rainfall data on a monthly basis in South Tangerang City, Banten found that rainfall prediction based on ANFIS time series is promising where 80% of data testing is well predicted.

TL;DR: In this paper, the authors investigated the surface seasonal mass changes and vertical crustal deformation in North China using the data obtained by the techniques of the Global Positioning System (GPS), Gravity Recovery and Climate Experiment (GRACE) and Surface Loading Models (SLMs).

TL;DR: In this paper, the global effects of the severe geomagnetic storm on the Earth's ionosphere on September 5-9, 2017 with Coronal Mass Ejections (CMEs) associated with X-9.3 flares on September 6, 2017 were investigated by the Rate of Total Electron Content (TEC) Index (ROTI).

TL;DR: It is implied that PPP technique is a powerful tool for highly accurate positioning in both real-time and post-mission modes, even for dynamic applications in harsh environments.

TL;DR: In this article, the authors characterised and mapped the land subsidence in Lagos city based on the analyses of geodetic data, which included Global Positioning Satellite (GPS), Envisat, Sentinel-1, and GRACE data.

TL;DR: In this article, the authors investigated the active crustal structure in Yogyakarta, Indonesia, using new and denser Global Positioning System (GPS) data, which revealed active tectonics indicating a combination of E-W dip-slip motion and N-S left-lateral structure.

TL;DR: Combining the observation data from five Multi-GNSS Experiment (MGEX) stations with the precise orbit and clock products from Global Positioning System and BeiDou Navigation Satellite System (BDS) has significantly improved the convergence speed, and its positioning accuracy is slightly than that of GPS.

TL;DR: In this article, the authors used the relief of the earth's surface, built on the map of Central Asia used to verify the solution of the inverse elasticity problem, to determine stresses variations in the region from earthquakes occurring in Central Asia.

TL;DR: In this article, the Coulomb failure stress of the mainshock with the aftershocks sequence following the 2018 Palu-Donggala earthquake in Indonesia was investigated.

TL;DR: In this paper, the authors provided an overview of current subsidence rates and assessed the spatial variability of land subsidence in the study area by using geostatistics that integrate semivariogram and ordinary kriging.

TL;DR: The resulting Istanbul GNSS/levelling geoid model is shown to be more reliable when compared with the model computed using conventional interpolation techniques.

TL;DR: In this article, the effects of total solar eclipse on variations of Total Electron Content (TEC), and consequently deviations on regional models of Vertical TEC (VTEC), as well as variations in ionospheric scintillation occurrence were investigated.

TL;DR: In this paper, the authors derived a discrete data smoothing function for the discrete Dirichlet condition in a regular grid on the surface of a spheroid using the local L 2 − semi-norm minimization, through Euler-Lagrange method.

TL;DR: In this article, the authors derived a special digital elevation model using 2,123 handheld GPS points for Sulaymaniyah Governorate, Kurdistan region, Iraq, which has the same vertical accuracy with the Root Mean Square (RMSE) of ±7.3m, ± 7.6m and ± 6.5m via 12 fixed Ground Control Points (GCPs) for the Advanced Land Observation Satellite Phased Array L-band Synthetic Aperture Radar (ALOS PALSAR 12.5mm), the Shuttle Radar Topographic Mission (SRTM 30

TL;DR: In this article, a quantitative assessment of seismic hazard of Uzbekistan has been examined, and new maps of seismic zoning has been developed, where quasihomogeneous seismological areas and seismgenerating zones are considered as seismic sources, based on the analysis of seismotectonic data.

TL;DR: In this article, the temporal analysis of these disturbances due to the seasonal variability is carried out for a mid-latitude GPS network using Ionosphere Research Laboratory TEC (IONOLAB-TEC) over Turkey.

TL;DR: In this paper, the authors estimated geodetic slip rate and locking depth of the Semangko Fault using Global Positioning System (GPS) time series data from 2007 to 2019 from all available GPS sites.

TL;DR: The developed model can efficiently be adopted as a substitute for single station ionospheric model for any single GNSS station within Africa, avoiding the need for developing independent multiple single station Ionospheric models for each of the existing and future GNSS stations within the African region.

TL;DR: In this article, with the help of two hydrogen atomic clocks (noted as H-masers), using the two-way satellite time and frequency transfer (TWSTFT) technique, carried out experiments of the geopotential difference determination at the China Aerospace Science & Industry Corporation (CASIC), Beijing.

TL;DR: In this paper, an application of the moving least squares approach is presented for geoid height approximation and interpolation using different polynomial basis functions for the approximant and interpolant, respectively, in a regular grid of geoid data in the region 16.0417 ∘ ≤ ϕ ≤ 47.9583 ∘ and 36.9582 ∘, with increment 0.0833 ∘ in both latitudal and longitudal directions.

TL;DR: In this paper, the authors used gravity, topographic, bathymetric, and sediment data together with results of seismic surveys to image the Moho topography beneath the Atlas region.

TL;DR: In this article, a 3D surface model using UAV images and the Structure from Motion (SfM) method was constructed for the Gebiling section of the Altyn Tagh fault.

TL;DR: In this article, the authors presented a new method of approximation such that the function and some of its derivatives are simultaneously approximated by deriving a numerical solver of ordinary differential equations by using Sobolev polynomials.

TL;DR: In this paper, a detailed and accurate three-dimensional (3D) crustal deformation velocities of the Tarim Basin and its surrounding areas through high-precision processing of existing Global Positioning System (GPS) data were obtained.

TL;DR: In this paper, the authors apply historical information and sensor-based data to find probable sources of earthquake nucleation, and then model the process to find its governing factors and extrapolate those in time and space, aiming towards finding hypocenter, fault-size, impact, and time of the impending earthquake.

TL;DR: In this paper, the authors analyzed the diurnal precipitable water vapor (PWV) variations over Central and South America for the period 2007-2013 using principal components analysis (PCA).

TL;DR: In this paper, the authors used a probabilistic approach and hazard is expressed in terms of not only macroseismic intensity, but also peak ground acceleration (PGA) to account for the effects of local soil conditions.

TL;DR: In this article, a new gravity base network in the south of the Tibetan Plateau was established with a FG5X absolute gravimeter and three CG-6 gravimeters, and the combined adjustment of absolute and relative gravity measurements results in the gravity values with a precision of about ± 4.1 μGal.

TL;DR: The Tectonic Geodesy Application (TGA) as mentioned in this paper is a user-friendly 64-bit tectonic geodesy mapping software based on the secondary development interface of the open source geographic information system QGIS.