Determination of local geoid model in Attica Basin Greece

Abstract

Orthometric elevations are nowadays determined not only through spirit or trigonometric levelling but also using GNSS techniques, under the condition that a geoid model exists in the area of interest. In this paper the estimation of a local geoid model in the area of the Attica Basin is presented. For this purpose a network of 15 points was established and measured using GNSS techniques. From the existing orthometric elevations and the geometric heights obtained after the adjustment, the geoid heights were determined. The best fitting surface approximating the local geoid in the Attica Basin is estimated and presented using three different parametric models as well as interpolation functions.

Keywords:

• GNSS
• Orthometric elevation
• Height
• Geoid model
• Vertical datum