The mean sea surface topography of the Ionian and Adriatic Seas has been determined. This was based on six-months Global Navigation Satellite System (GNSS) measurements which were performed Queen (a ship). analyzed following a double-path methodology differential GNSS (D-GNSS) precise point positioning (PPP) analysis. Numerical filtering techniques, multi-parametric accuracy analysis new techni...

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...

S U M M A R Y We show the numerical applicability of a multiresolution method based on harmonic splines on the 3-D ball which allows the regularized recovery of the harmonic part of the Earth’s mass density distribution out of different types of gravity data, for example, different radial derivatives of the potential, at various positions which need not be located on a common sphere. This appro...

Determination of the geoid with a high accuracy is the main task among researchers in the geodetic community. Precise determination of a regional geoid is usually carried out combining a global geopotential model data with a set of point or mean terrestrial gravity anomalies measured in the region and some topographic information. In this research a primary Iranian gravimetric geoid model has b...

The observables of the GOCE three-axis gradiometer are taken in time, along the orbit and, in the timewise proposal, filtered to stay in the measurement bandwidth, i.e. in the frequency interval between 0.005 and 0.1 Hz. As a consequence, the resulting “observable” is a convolution of the original data stream with a time-wise weighting kernel. In other words, we cannot assume that the observati...

Fast and accurate relative positioning for baselines less than 20 km in length is possible using dual-frequency Global Positioning System (GPS) receivers. By measuring orthometric heights of a few GPS stations by di€erential levelling techniques, the geoid undulation can be modelled, which enables GPS to be used for orthometric height determination in a much faster and more economical way than ...