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IAG 150 Years pp 263–270Cite as

Improving and Validating Gravity Data Over Ice-Covered Marine Areas

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Part of the book series: International Association of Geodesy Symposia ((IAG SYMPOSIA,volume 143))

Abstract

For accurate regional gravity field modelling it is vital to have dense and high quality data coverage. Ice gravimetry is a viable alternative to ship- and airborne gravimetry to help fill gaps over marine areas. A number of factors affect the accuracy of gravimetry on ice, thus special survey and data processing methods are needed. Nevertheless with appropriate methods an accuracy of ±0.16 mGal was achieved on coastal ice. An efficient method for positioning of survey points is RTK GNSS which takes no more than a few minutes on each point and the accuracy achieved is at least ±0.15 cm, while 10 min static surveys also yield acceptable results.This study reports ice gravity surveys proceeded on shore-fast ice in the Väinameri Basin, Estonia. Acquired gravity data agree with existing airborne data while covering a larger area. As a result of the survey it was possible to confirm and specify the extents of an area of positive anomalies. An effort to determine the geoid heights over Väinameri Basin directly via using the GNSS data gathered during gravity surveys on ice was made. For now it proved to be less reliable than classical geoid determination from gravity data.

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Acknowledgements

This study was funded by the Estonian Science Foundation grant ETF8749 and the Estonian Environmental Technology R&D Programme KESTA project ERMAS AR12052. Transport on ice was provided by the Estonian Environmental Board, access to the VRS RTK service via Trimble VRS Now Estonia by Geosoft Ltd. Mr. E. Grünthal and A. Bloom are thanked for assistance in field works. Conference participation of the prime author was supported by the European Social Funds’ program DoRa. The three anonymous reviewers are thanked for their constructive comments.

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Authors and Affiliations

  1. Tallinn University of Technology (TUT), Ehitajate tee 5, 19086, Tallinn, Estonia

    S. Märdla & A. Ellmann

  2. Estonian Land Board, TUT, Mustamäe tee 51, 10621, Tallinn, Estonia

    T. Oja

  3. Estonian University of Life Sciences, Kreutzwaldi 1a, 51014, Tartu, Estonia

    H. Jürgenson

Authors
  1. S. Märdla
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  2. A. Ellmann
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  3. T. Oja
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  4. H. Jürgenson
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Corresponding author

Correspondence to S. Märdla .

Editor information

Editors and Affiliations

  1. School of Surveying Information, University of New South Wales, Sydney NSW, Australia

    Chris Rizos

  2. c/o Editorial Board 190, Heidelberg, Baden-Württemberg, Germany

    Pascal Willis

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Märdla, S., Ellmann, A., Oja, T., Jürgenson, H. (2015). Improving and Validating Gravity Data Over Ice-Covered Marine Areas. In: Rizos, C., Willis, P. (eds) IAG 150 Years. International Association of Geodesy Symposia, vol 143. Springer, Cham. https://doi.org/10.1007/1345_2015_163

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