IntroMapStation listsStation detailsServicesDisclaimer & policy


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.

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 timeframe), 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 (on which we DO NOT have information)

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: research quality data is not the aim of this service. See the note about 'Research quality data' on the front page.