COTAGA: Combined Ocean Tide Analysis by GRACE and Altimetry data (2011-2012)

The general objective of COTAGA is to provide the most precise global ocean tide models, EOTxx, estimated by common analysis of multi-mission satellite altimetry and long-term GRACE observations in order to combine in an optimal sense short and long-wavelength signals of the major ocean tide constituents. EOTxx shall provide the most comprehensive and up-to-date description of tidal mass variations, become a candidate for the standard processing schemes in satellite altimetry, GRACE and GOCE processing (e.g. GRACE release 06), as well as for many other applications (ocean dynamics, tidal dissipation, Earth rotation, loading effects) in Earth system sciences.

COTAGA is a joint project of the following institutions:

  • Institute of Geodesy, Graz University of Technology, Austria
  • Deutsches Geodätisches Forschungsinstitut München (DGFI)
  • Deutsches GeoForschungszentrum Potsdam (GFZ)


The empirical ocean tide models EOTxx can be found in the download section

Ocean tide models


This project is funded within the Special Priority Program SPP1257 ’Mass transport and Mass distribution in the system Earth’ by the Deutsche Forschungsgemeinschaft (DFG), Bonn, Germany


T. Mayer-Gürr, R. Savcenko, W. Bosch, I. Daras, F. Flechtner, Ch. Dahle, Ocean tides from satellite altimetry and GRACE, Journal of Geodynamics, Volumes 59–60, September 2012, Pages 28-38, ISSN 0264-3707,

Petit G. and Luzum B., editors. IERS Conventions (2010). IERS Technical Note No. 36. Verlag des Bundesamts für Kartographie  und Geodäsie, Frankfurt am Main, 2010.

Barthelmes F. and Förste C. The ICGEM-format. Technical report, GFZ Potsdam, Department 1 Geodesy and Remote Sensing, June 2011.

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Torsten Mayer-Gürr
Steyrergasse 30/III
8010 Graz
Tel: +43 316 873-6359
Fax: +43 316 873-6845