Gravity-based heights require gravity values at levelled benchmarks (BMs), which sometimes have to be predicted from surrounding observations. We use EGM2008 and the Australian National Gravity Database (ANGD) as examples of model and terrestrial observed data respectively to predict gravity at Australian national levelling network (ANLN) BMs. The aim is to quantify errors that may propagate in...

In this paper we present the concepts and realization of the shallow-layer Shen geoid determination method, which is quite different from the classical geoid modeling methods (Stokes’ method, Molodenskiĭ’s method, etc.), for determining the global or regional geoids. This method takes full advantage of the precise Earth gravity field model EGM2008, digital topographic model DTM2006.0 and global...

The NZGeoid09 gravimetric quasigeoid model of New Zealand was computed through FFT-based 11 Stokesian integration with a deterministically modified kernel and an iterative computation approach 12 that accounts for offsets among New Zealand’s 13 different local vertical datums (LVDs). NZGeoid09 is 13 an improvement over the previous NZGeoid05 due to use of the EGM2008 and DNSC08GRA models, 14 an...

This study demonstrates that in mountainous areas the use of residual terrain model (RTM) data significantly improves the accuracy of vertical deflections obtained from high-degree spherical harmonic synthesis. The new Earth gravitational model EGM2008 is used to compute vertical deflections up to a spherical harmonic degree of 2160. RTM data can be constructed as difference between high-resolu...

Spherical harmonic synthesis (SHS) of gravity field functionals at the Earth’s surface requires the use of heights. The present study investigates the gradient approach as an efficient yet accurate strategy to incorporate height information in SHS at densely-spaced multiple points. Taylor series expansions of commonly used functionals quasigeoid heights, gravity disturbances and vertical deflec...

Several global geopotential models based on Gravity eld and steady-state Ocean Circulation Explorer (GOCE) data have been published in the last two years. Some of these models use combinations of different satellite missions, while others use only GOCE data. This paper presents the evaluation and analysis of each approach using GOCE data in the Southeast of Brazil. Two assessments have beenmade...

The advent of Global Navigation Satellite System (GNSS) and Earth Gravitational Model (EGM)particularly Positioning (GPS) has modernized geodetic surveying in providing horizontal vertical positions points with a sub-meter level accuracy over the reference ellipsoid. GPS gives ellipsoidal heights which makes conversion to orthometric possible by incorporating geoid model. conventional method de...

We apply the residual terrain modeling (RTM) technique for gravity forward-modeling to successfully improve high-resolution global gravity fields at short spatial scales in coastal zones. The RTM scheme is combined with the concept of rock-equivalent topography, allowing to use a single uniform constant mass-density in the RTM forward-modeling, both at land and sea. SRTM30_PLUS bathymetry is me...

As the most active plateau on the Earth, the Qinghai-Tibet Plateau (TP) has a complex crust–mantle structure. Knowledge of the distribution of such a structure provides information for understanding the underlying geodynamic processes. We obtain a three-dimensional model of the density of the crust and the upper mantle beneath the TP and surrounding areas from height anomalies using the Earth G...