The gravity survey and the gravimetric map of the territory of Lithuania

Abstract

We present a concept for a modern gravimetric-geodetic survey, the data processing and analysis of gravimetric observations and, ultimately, the new gravimetric map of the territory of Lithuania. In this connection, we outline the applied algorithms for calculating free-air gravity anomalies and Bouguer anomalies as well as assess their accuracy and the ones of other parameters. The following accuracies were obtained: the uncertainties of gravity acceleration according to differences detected at control points, 0.021 mGal; coordinates, 0.025 m; ellipsoidal heights, 0.015 m; Bouguer anomalies, 0.073 mGal; interpolated Bouguer anomalies, 0.326 mGal. We further describe the content of the gravimetric map. The map shows gravity measurement points together with their recorded value of Bouguer anomaly. Isoanomalies of gravity acceleration are drawn every 2 mGal. The scale of the map is 1:200,000. The printed version of the gravimetric map of the territory of Lithuania consists of 15 pages (50×50 cm).