Welcome to the free ocean tide loading provider
January 20, 2018: Gravity (and Tilt) are undergoing a revision.
This part of the service remains disabled until further notice. The reason being that
results have been inconsistent between the computation sites as to tilt orientation.
Also, the measurement units have caused misunderstanding (r.t.f.h.!, h. meaning the BLQ HEADER),
and we have to crack our heads how to communicate with sufficient emphasis.
December 24, 2017: Global grids of tide-induced displacements avaiilable
November 10, 2017: New tide model added: GOT.4.10c
August 4, 2017: New version of converter script for BLQ to
g-Software (Micro'g Lacoste),
and now also ETERNA.
a converter script olgte.pl
(in perl v.5.8.8). To run it under MS Windows,
February 12, 2017: Speedier service for jobs forwarded to Segal.
Clients who request calculations with the high-resolution models FES2014b, FES2012 and TPXO8-Atlas
had previously to wait in the queue at OSO until their job was in the top position.
Now, the job queue is processed separately, and high-resolution jobs are relayed to Segal
immediately (i.e. with 10 seconds delay at maximum).
November 1 and September 26, 2016: New Tide Models.
As eagerly awaited in the user community, we have added FES2014b, FES2012 and TPXO8-Atlas to
the available range of Ocean tide models, thanks to the efforts of Machiel.
The computations are automatically forwarded to SEGAL at UBI/IDL in Portugal, so that the
receivers of the parameter files would notice as small changes as possible, and - if the machines
and their connections are working - none at all as regards basic user interaction and delivery.
As of yet, a few options won't work with the relayed jobs: There's no plot option and no live
job activity-and-queue report.
SEGAL is a facility at the University of Beira Interior and Institute Dom Luiz.
July 20, 2012: Time series from BLQ-files -
June 20, 2011: mGal is not an SI unit,
and the numbers in the BLQ
result files lack numerical resolution.
Thus a change in conventions was made:
Henceforth, if you select
Gravity, the results are presented in μm/s2.
However, you can select "mGal" if you still prefer that.
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