Tidal Analysis and Prediction Software

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For tidal harmonic analysis of sea level data, there are various packages available:

The University of Hawaii and the NOC software packages are based on different mathematical engines. TASK is based on software developed by NOC (previously known as the Proudman Oceanographic Laboratory) over many years whereas the core of the University of Hawaii software is based on the work of Michael Foreman (Institute of Ocean Sciences in Canada). There are some subtle differences in the definitions of harmonic constants, which make the two slightly incompatible. These differences are documented in the TASK User Guide. Note that the UK Hydrographic Office’s internal analysis software uses the same mathematical definitions for harmonics as the NOC software. Therefore any users that obtain harmonic constants from the UKHO should check that their choice of prediction software is compatible. Questions should be directed to the NOC Marine Data Products Team.

The Foreman tidal analysis software is available separately, while there is also a Matlab version available from Rich Pawlowicz.


For UK users, tidal predictions can be most easily obtained through the POLTIPS-3 package, which is available from the National Oceanography Centre Marine Data Products Team.

An alternative is TotalTide from the UK Hydrographic Office which provides tidal height and tidal stream predictions worldwide. Click on Products at their website.

For French-speakers, tidal predictions can be obtained from SHOM.