SRTM/DTM2006.0 residual terrain model data to improve quasigeoid computations in mountainous areas devoid of gravity data, Journal of Geodesy 84(9): 557-567. Abstract: A global geopotential model, like EGM2008, is not capable of representing the high-frequency components of Earth's gravity field. This is known as the omission error. In mountainous terrain, omission errors in EGM2008, even when ...

The Lense-Thirring effect is currently being measured by means of a combination of the orbital residuals of the nodes of LAGEOS and LAGEOS II and the perigee of LAGEOS II. The claimed total error should be of the order of 20%. The most insidious systematic error is due to the mismodelled even zonal harmonics of the geopotential and amounts to 12.9%, according to the full covariance matrix of th...

Abstract In this study, we apply a spectral combination method for estimation of height anomalies from gradients the gravitational potential measured by satellites. The is used solving over-determined problems within gravity field modelling when multiple types data are collected and recovery unobservable quantities (typically potential). applies solutions to geodetic boundary-value formulated i...

How to cite this article: Botai CM, Combrinck L. Global geopotential models from Satellite Laser Ranging data with geophysical applications: A review. S Afr J Sci. 2012;108(3/4), Art. #662, 10 pages. http:// dx.doi.org/10.4102/sajs. v108i3/4.662 The launch of artificial satellites (as early as in 1957), specifically the launch of the first laser tracked satellite, Beacon-B, in 1964, has provide...

In this work, the use of adaptive filters for reducing forecast errors produced by a Regional Climate Model (RCM) is investigated. Seasonal forecasts are compared against reanalysis data provided National Centers Environmental Prediction. The used to train based on Recursive Least Squares algorithm in order reduce error. K-means unsupervised learning obtain number employ from climate variables....

This work analyses the link between Western Europe large-scale circulation and precipitation variability in Northern French Alps from 1950 to 2017. We consider simple descriptors characterizing daily 500 hPa geopotential height fields. They are maximum pressure difference (MPD)—representing range of heights over Europe, singularity—representing mean distance a shape its closest analogs, that is...

This study proposes an algorithm detecting atmospheric blocking by extracting topological features of geopotential height data at 500 hPa. The uses flow analysis (TFDA) providing a unique symbolic representation, named the partially cyclically ordered rooted tree (COT) and discrete graph structure, called Reeb graph, to each structurally stable Hamiltonian vector field based on mathematical the...

We use a conditional deep convolutional generative adversarial network to predict the geopotential height of 500 hPa pressure level, two-meter temperature and total precipitation for next 24 h over Europe. The proposed models are trained on 4 years ERA5 reanalysis data from with goal associated meteorological fields in 2019. forecasts show good qualitative quantitative agreement true temperatur...