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Journal of Geodetic Science

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Towards worldwide height system unification using ocean information

P.L. Woodworth
  • Corresponding author
  • National Oceanography Centre, Joseph Proudman Building, 6 Brownlow Street, Liverpool L3 5DA, United Kingdom
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/ C.W. Hughes
  • National Oceanography Centre, Joseph Proudman Building, 6 Brownlow Street, Liverpool L3 5DA, United Kingdom
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/ R.J. Bingham
  • School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne NE1 7RU, United Kingdom
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/ T. Gruber
  • Institut für Astronomische und Physikalische Geodäsie, Technische Universität München, Arcisstrasse 21, 80333 München, Germany
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Published Online: 2013-01-29 | DOI: https://doi.org/10.2478/v10156-012-0004-8


We describe the application of ocean levelling to worldwide height system unification. The study involves a comparison of ‘geodetic’ and ‘ocean’ approaches to determination of the mean dynamic topography (MDT) at the coast, from which confidence in the accuracy of stateof- the-art ocean and geoid models can be obtained. We conclude that models are consistent at the sub-decimetre level for the regions that we have studied (North Atlantic coastlines and islands, North American Pacific coast and Mediterranean). That level of consistency provides an estimate of the accuracy of using the ocean models to provide an MDT correction to the national datums of countries with coastlines, and thereby of achieving unification. It also provides a validation of geoid model accuracy for application to height system unification in general. We show how our methods can be applied worldwide, as long as the necessary data sets are available, and explain why such an extension of the present study is necessary if worldwide height system unification is to be realised.

Keywords: Mean Dynamic Topography; National Datums; Ocean and Geoid Models; Ocean Levelling

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About the article

Published Online: 2013-01-29

Published in Print: 2012-12-01

Citation Information: Journal of Geodetic Science, ISSN (Print) 2081-9943, DOI: https://doi.org/10.2478/v10156-012-0004-8.

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