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Geoid Estimation on Northern Victoria Land

G. Bitelli (1), A. Capra(2), F. Coren(3), S. Gandolfi(1), P.Sterzai(3),
(1) DISTART – University of Bologna -V.le Risorgimento n.2 - 40136 Bologna, Italy;
(2) DAU – Polytechnic of Bari - V.Orabona n.4 - 70125 Bari, Italy; (3) O.G.S. –Borgo

Grotta Gigante 42/c- Sgonico, Trieste

E-mail: alessandro.capra@mail.ing.unibo.it

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Abstract

A program for local geoid determination through gravimetric measurements was started in Victoria Land [1], in an area located around the Italian base Terra Nova Bay. The program started an activity planned on a more extended area, with the aim to evaluate an high accuracy geoid for all northern Victoria Land.

Points distributed on a regular grid of 3.75’ latitude and 15’ longitude, corresponding to an average distance of 10 km, were measured in Mount Melbourne and Mount Murchison area. Moreover sparse points were measured around the planned grid.

The positioning of gravimetric stations has been made by precise GPS method in order to obtain a decimeter accuracy in coordinate determination. This accuracy, overall for the height, is fundamental for high accuracy geoid estimation. The gravimetric closure has been made on IRGS (Italian Relative Gravity Station) located at Terra Nova Bay. Gravimetric data will be reduced using the DTM from BEDMAP project for the interior and using the DEM generated by INSAR surveying along the coast. Preliminary results of local geoid estimation are presented.

References:

[1] Barzaghi R., Borghi A., Capra A., Gandolfi S. Analysis of Regional Geoid Estimation in Victoria Land. AGS’01 (Antarctic Geodesy Symposium), St.Petersburg, Luglio 2001, SCAR Report N.21, pp.6-8, January 2002.