Nowadays GPS technology permits to reach millimeter or sub-millimeter horizontal relative accuracy levels over very long distances (up to hundreds of kilometers). The vertical GPS accuracy is more difficult to obtain. In addition, because GPS heights are referred to ellipsoid, their transformation into orthometric heights requires the use of a geoid model that influences with its accuracy the quality of the results. Usually a local geoid model is characterized by a high level of accuracy, but often it has a fee. Global geoid models are free available and their accuracy is to test in the local area where they are to use so to evaluate their suitability for the user purposes. This paper is aimed to compare different Global Geoid Models testing their accuracy on Campania region (Italy). Particularly, models respectively named EGM84, EGM96 and EGM2008, are considered and tested on 18 points corresponding to GNSS Permanent Stations in Campania. For the best resulting model, the EGM2008, a solution to improve further its performance is adopted.

Accuracy of global geoid height models in local area: Tests on Campania region (Italy)

Maglione, P.;Parente, C.
;
Vallario, A.
2018

Abstract

Nowadays GPS technology permits to reach millimeter or sub-millimeter horizontal relative accuracy levels over very long distances (up to hundreds of kilometers). The vertical GPS accuracy is more difficult to obtain. In addition, because GPS heights are referred to ellipsoid, their transformation into orthometric heights requires the use of a geoid model that influences with its accuracy the quality of the results. Usually a local geoid model is characterized by a high level of accuracy, but often it has a fee. Global geoid models are free available and their accuracy is to test in the local area where they are to use so to evaluate their suitability for the user purposes. This paper is aimed to compare different Global Geoid Models testing their accuracy on Campania region (Italy). Particularly, models respectively named EGM84, EGM96 and EGM2008, are considered and tested on 18 points corresponding to GNSS Permanent Stations in Campania. For the best resulting model, the EGM2008, a solution to improve further its performance is adopted.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11367/70199
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