Bulletin géodésique

, Volume 61, Issue 2, pp 177–197 | Cite as

Determination of geoidal heights and deflections of the vertical for the hellenic area using heterogeneous data

  • I. N. Tziavos
Article

Abstract

Mean gravity anomalies, deflections of the vertical, and a geopotential model complete to degree and order180 are combined in order to determine geoidal heights in the area bounded by [34°≦ϕ≤42°, 18°≦λ≦28°]. Moreover, employing point gravity anomalies simultaneously with the above data, an attempt is made to predict deflections of the vertical in the same area. The method used in the computations is least squares collocation. Using empirical covariance functions for the data, the suitable errors for the different sources of observations, and the optimum cap radius around each point of evaluation, an accuracy better than±0.60m for geoidal heights and±1″.5 for deflections of the vertical is obtained taking into account existing systematic effects. This accuracy refers to the comparison between observed and predicted values.

Keywords

Gravity Anomaly Geopotential Model Geoid Undulation Physical Geodesy Geoid Determination 

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Copyright information

© Bureau Central de L’Association Internationale de Géodésie 1987

Authors and Affiliations

  • I. N. Tziavos
    • 1
  1. 1.Department of Geodesy and SurveyingUniversity of ThessalonikiThessalonikiGreece

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