Welcome to the free ocean tide loading provider
Aug. 13, 2012:
An error in the post-processor (used for sites near coasts) caused small errors (sub-mm) in loading coefficients.
The problem was fixed today. From Nov. 26, 2012, on, the sites are
marked on the charts.
Nov. 28, 2012:
had another error. Updated today, please download again.
Nov. 8, 2011:
had an error. Please download again.
Please re-issue requests if both of the following two criteria apply
The BLQ record indicates that OLMPP was used ("Computed by OLMPP")
The job was carried out between June 15 and July 25, 2011
Consider to re-issue requests for stations in the Pacific area
if your results have been computed before June 15, 2011, even long before.
Our sincere thanks go to Andreas Richter and Mathias Fritsche who
brought the problem to our attention.
Hans-Georg and Machiel
Read here the details.
May 7, 2014: New tide model: OSU12
July 20, 2012: Time series from BLQ-files -
June 13, 2012: New tide models
(all have a resolution of 1/8°×1/8°)
from NASA Goddard Space Flight Center and University of Maryland (Richard Ray).
In this update of GOT4.7 only the S2
tide is affected.
July 29, 2011: Centre-of-mass coefficients:
text added and a wager issued.
July 29, 2011: A note on mass conservation:
It should be noted that from the earliest beginnings of this site, the
parameters (gravity, tilt, displacements) imply a correction to obtain a global mass balance.
We may consider to offer you an alternative, a radio button to switch it off.
July 26, 2011: BLQ to
g-Software (Micro'g Lacoste) converter.
a converter script olgt.pl
(in perl v.5.8.8). To run it under MS Windows,
June 20, 2011:
mGal is not a metric 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.
Dec. 24, 2008: BLQ-files format
BLQ format, header record #5 changed:
$$ GOT00.2_PP ID: 2008-12-23 23:54:30
$$ Computed by OLCMC/OLMPP by H G Scherneck, Onsala Space Observatory, 2008
lon/lat: 11.9264 57.3958 10.00
Column 69: Station height (F8.2)
was necessary in order to keep XYZ and Lon Lat H consistent throughout
the different stages of the process.
Those who need gridded ocean loading coefficients, please contact me
at   hgs kanelbulle
chalmers dot se
You may like to visit the
Ocean Loading Grids
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