Welcome to the free ocean tide loading provider
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 in Portugal.
February 05, 2018: Alternative loading Greens function available
For decades the load convolution used an elastic Greens function
ased on the Gutenberg-Bullen earth model. You can choose an alternative,
a Green's function for an anelastic Earth based on PREM assuming a flat Q-factor spectrum.
We call it STW105. It has been computed with Machiel Bos' program Astyanax.
Presently, the PREM option is not available yet with ocean models
FES2014b, FES2012 and TPXO8-Atlas; we are working on it.
Further 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. We had to
bring scaling and signs at both computing sites into consistency first.
Still, please read the header information in the result mail carefully!
We kindly urge all users who used
our service for tilt before Feb. 05, 2018, to issue their requests again.
February 05, 2018: Revised version of converter script for BLQ to
g-Software (Micro'g Lacoste),
a converter script olgte.pl
(in perl v.5.8.8).
Caution, this is still a beta-version!
To run it under MS Windows,
December 24, 2017: Grids
Global grids of ocean tide loading displacements
in netCDF-format and medium resolution are now available.
Please read the instructions presented when you follow the link. Feedback is highly welcome.
The new set is provided as-is, no service is included except the promise that we inform
those users that left us a note of updates and bug reports.
Machiel Bos and HGS are currently working towards augmenting the Loading Provider with a new
set of high-resolution grids, much more actual and user-friendly, we hope. Goal: Ready in
the first quarter of 2018.
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, it 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