IntroMapStation listsStation detailsServices & FAQGLOSSCatalog


If you have realtime sealevel data that you would like to share via this facility, become one of the data provider by sending an email to

Enter or edit station metadata

Station metadata can be edited manually by the operator responsible for the respective station.
You'll need to register for this, please follow instructions on this page.

BGAN service

We provide a service that allows data providers to post messages to the Global Telecommunication System (GTS).
Messages can be provided via a BGAN terminal or any station that is able to do TCP/IP socket communication
You can read any technical details here

Sealevel Station Catalog (SSC)

The catalog is giving an overview of all identifiers used by the different data providers.
Only 3 core fields are stored in the database: the name, latitude and longitude of the station. Any other information is taken directly from the data providers. This should make it easy to verify the mapping between the different data providers.
RSS feeds and webservices are provided to retrieve information from the SSC.
Data providers are encouraged to verify and/or add their own stations.
You can access the catalog here

Direct data access web service

Most of the station descriptive metadata and the station realtime data is accessible through a REST web service.
Users are required to register for this service. Having your contact details will enable us to keep track of the use of this facility, solve performance problems at network level and contact you in case of changes or maintenance activities.
Simply register by sending an email to including your IP address and reason for registering.

Notice: Long-term mean sea level (MSL) data is not the aim of this service. See the note on the front page.


Outlier detection and spike removal on station graphs

The outlier detection works as follow:

  • All values X where abs(X – median) > tolerance are hidden.
  • With tolerance = 3*abs(percentile90 - median)
  • The statistics (median and percentile90) are calculated on the data being plotted (12h, 1d, 7d, 30d)
For the spike removal we take the median out of a window with size 3.

What does the 'offset' value represents

The offset is the average (from all values in the current start-end time frame), that we subtracted to make sure the graph evolves around zero.
This allows us to align multiple sensors with different offsets on top of each other.
This is a purely mathematical value, not the actual physical offset/datum or absolute sea level

Where can I find the vertical datum information (absolute, referenced sea level)

We only deal with relative data, we don't have the vertical datum information available.
For referenced data you should contact the station operator, or click on the 'Long-term MSL data' link on the station details page.