TPXO9-atlas is our latest 1/30 degree resolution fully global solution, obtained by combining 1/6 degree base global solution TPXO9.v1 and thirty 1/30 degree resolution local solutions for all coastal areas, including Arctic and Antarctic. All TPXO9-atlas patches were obtained using consistent bathymetry and boundary conditions from TPXO9 base solution, using the same altimetry data sets for assimilation. The local solution boundaries are shown above with frames on the background of absolute M2 elevation difference between TPXO9 and TPXO9-atlas. The scale is logarithmic. Thus red color corresponds to ~1m, yellow to ~10cm and blue to ~1mm difference. There is no difference between the two solutions in the deep ocean (white).

We provide both TPXO9-atlas 1/30 degree resolution and TPXO9 1/6 degree base global solution in two popular formats:

  1. our traditional binary format (OTPS format);
  2. netcdf format

TPXO9-atlas is set of elevation/transport files one constituent per file. TPXO9 includes two multi-constituent files of elevations/transports.

TPXO9-atlas latest version: v2, released Apr 1, 2020: improvements in Hudson Strait, Magellan Strait, Coastal Australia, Yellow Sea, Amazon Shelf, Patagonian Shelf, European Shelf

NEW: TPXO9v2a - multi-constituent global 1/6 degree resolution hybrid product. It is the same as TPXO9.v1 in the open ocean, and it is averaged TPXO9-atlas-v2 onto TPXO9 1/6 degree resolution grid in coastal areas. Released Apr 1, 2020

TPXO9v1, TPXO9v2a and TPXO9-atlas are available for academic research and other non-commercial uses and require registration.


TPXO9 models can be licensed for commercial use at modest cost - please contact Dr. Erofeeva or Prof. Egbert on details. Our customers are eligible for free upgrades within one year.

To refer to our models/software in your publications please use the citation:

Egbert, Gary D., and Svetlana Y. Erofeeva. "Efficient inverse modeling of barotropic ocean tides." Journal of Atmospheric and Oceanic Technology 19.2 (2002): 183-204.

Check out our TPXO Web Service to get tide predictions from TPXO9-atlas at any location and time.