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Proceedings of the International Association of Hydrological Sciences An open-access publication for refereed proceedings in hydrology
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Volume 365
Proc. IAHS, 365, 11–15, 2015
https://doi.org/10.5194/piahs-365-11-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Proc. IAHS, 365, 11–15, 2015
https://doi.org/10.5194/piahs-365-11-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

  02 Mar 2015

02 Mar 2015

Towards worldwide height unification using ocean information

P. L. Woodworth and C. W. Hughes P. L. Woodworth and C. W. Hughes
  • National Oceanography Centre, Joseph Proudman Building, 6 Brownlow Street, Liverpool L3 5DA, UK

Keywords: Height unification; mean sea level; geodetic science; geoid models; national datums

Abstract. This paper describes how we are contributing to worldwide height system unification (WHSU) by using ocean models together with sea level (tide gauge and altimeter) information, geodetic (GPS and levelling) data, and new geoid models based on information from the GRACE and GOCE gravity missions, to understand how mean sea level (MSL) varies from place to place along the coast. For the last two centuries, MSL has been used to define datums for national levelling systems. However, there are many problems with this. One consequence of WHSU will be the substitution of conventional datums as a reference for heights with the use of geoid, as the only true "level" or datum. This work is within a number of GOCE-related activities funded by the European Space Agency. The study is focused on the coastlines of North America and Europe where the various datasets are most copious.

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