Welcome to the free ocean tide loading provider
March 11, 2022: Extended parsing of requests
A more thorough parsing of station records has been enacted.
Requests that fail the test will not be processed.
Instead, the system sends a notification back to the user with hopefully useful advice.
February 03, 2022: New model TPXO.9.5a
This is a 1/6×1/6 degree model, an update of TPXO.9.2a
December 2021: Stricter coding requirements for direct email
If you bypass the web page and instead send your requests by email, we refer to
as users had been experiencing denial of service.
April 25, 2021: New model EOT20
(Hart-Davis et al., DGFI, doi=10.17882/79489)
July 12, 2021: Problems have been found recently. A
revised version has been installed today at 10:00 UTC.
Please resend your requests issued before this date.
August 9, 2020: Error in GOT4.10c with centre of mass option
Tides Q1 and K2 had erroneous coefficients for centre of mass.
Please resubmit your sites if you have used this
combination of options.
June 26, 2020: New model TPXO.9.2a
March 7, 2020: Error in our copies of GOT4.10c, Q1
and K2 amplitudes, corrected.
For high-precision applications, the set of loading
coefficients should be recomputed.
January 6, 2019: New model TPXO.9-Atlas
A high-resolution model, 30x30 cells per square-degree.
Loading jobs are carried out at SEGAL at UBI/IDL inPortugal.
February 05, 2018: Alternative loading Greens function available
For decades the load convolution used an elastic Greens
function based on the Gutenberg-Bullen earth model. You can
choose an alternative, a Green's function for an anelastic Earth
reading: Bos and Scherneck (2013)
February 05, 2018: A pro-memoriam on BLQ files (updated)
with emphasis on phase and its conversion for reckoning
with respect to the local solid earth tide.
February 05, 2018: Revision of service for gravity and tilt
Today the service goes official with tilt parameters
February 05, 2018: Revised version of converter script
for BLQ to
With the growing number of precise geodetic observations, the requests
for ocean tide loading values have increased considerably.
Therefore, this webpage has been created in the hope it will help
the geodetic community. Just select an ocean tide model, tick the
required type of loading, fill in the coordinates of the stations, give
your e-mail address and press the submit button. The program will
check if it can read your input and if so, will calculate the
values and send the results to you by e-mail. The program will take about
5 minutes per station. An example of the output in normal BLQ-formal
can be found
while an example of the output in the new
can be found
If you find it tiresome to go through our web interface, you can send
email to the loading provider in a