TPXO*.* is a current version of a global model of ocean tides, which best-fits, in a least-squares sense, the Laplace Tidal Equations and along track averaged data from TOPEX/Poseidon and Jason (on TOPEX/POSEIDON tracks since 2002) obtained with OTIS. The methods used to compute the model are described in details by Egbert, Bennett, and Foreman,1994  and further by Egbert and Erofeeva, 2002

The tides are provided as complex amplitudes of earth-relative sea-surface elevation for eight primary (M2, S2, N2, K2, K1, O1, P1, Q1), two long period (Mf,Mm) and 3 non-linear (M4, MS4, MN4) harmonic constituents, on a 1440x721, 1/4 degree resolution full global grid (for versions 6.* and later).

Each latest version of the TPXO model is of better quality compared to the earlier versions, since:
it assimilates longer satellite time series;
more data sites are included into assimilation;
bathymetry is improving from version to version;
resolution of global and local grids is improving from version to version;

To extract tidal harmonic constants and/or predict tide using TPXO*.* GLOBAL tidal solution you MUST first download OTPS (OSU Tidal Prediction Software) or OPTPSnc (same as OTPS, but for our models in netcdf format). OTPS(nc) is written in Fortran 90 and tested under UNIX/Linux. The compressed and tarred OTPS(nc) packages contain README files with details on tidal solution installation and usage. There also exist a MATLAB toolbox, called Tidal Model Driver (TMD), functionally the same as OTPS. The TMD toolbox also includes a friendly graphical user interface. Use menu on the left to download.