Regional geoid determination in Antarctica utilizing airborne gravity and topography data |
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| Authors: | Mirko Scheinert Jan Müller Reinhard Dietrich Detlef Damaske Volkmar Damm |
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| Institution: | 1. Institut für Planetare Geod?sie, Technische Universit?t Dresden, 01062, Dresden, Germany
2. Federal Institute for Geosciences and Resources (BGR), Stilleweg 2, 30655, Hannover, Germany
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| Abstract: | Antarctica is the only continent that suffers major gaps in terrestrial gravity data coverage. To overcome this problem and
to close these gaps as well as to densify the global satellite gravity field solutions, the International Association of Geodesy
(IAG) Commission Project 2.4 “Antarctic Geoid” was set into action. This paper reviews the current situation concerning the
gravity field in Antarctica. It is shown that airborne geophysical surveys are the most promising tools to gain new gravity
data in Antarctica. In this context, a number of projects to be carried out during the International Polar Year 2007/2008
will contribute to this goal. To demonstrate the feasibility of the regional geoid improvement in Antarctica, we present a
case study using gravity and topography data of the southern Prince Charles Mountains, East Antarctica. During the processing,
the remove–compute– restore (RCR) technique and least-squares collocation (LSC) were applied. Adding signal parts of up to
6 m to the global gravity field model that was used as a basis, the calculated regional quasigeoid reveals the dominant features
of bedrock topography in that region, namely the graben structure of the Lambert glacier system. The accuracy of the improved
regional quasigeoid is estimated to be at the level of 15 cm. |
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| Keywords: | Antarctica Regional geoid modelling Remove– compute– restore (RCR) technique Aerogravimetry |
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