The REFMAR dissemination of tidal data is transfered to the site, the marine and coastal geographic information portal

REFMAR and staff are available to help you make the switch and answer all your questions.

Any application for registration or account changes are no longer taken into account.

JSON file format for REFMAR tide gauge data available on

JSON, which stands for JavaScript Object Notation, is one of 3 REFMAR tidal data dissemination formats available on It is a text format derived from JavaScript object notation. It is used to represent structured information the way XML can.


JSON format:

The JSON file contains a "header" block. This block provides the coordinates of the tidal observatory for which the sea level measurements are being downloaded.



The rest of the file consists of the following blocks:

 1 {

2        "type":"",

3        "procedure":"",

4        "offering":"",

5        "observableProperty":"",

6        "featureOfInterest":

7        {

8                "identifier":

9                {

10                        "codespace":"",

11                        "value":

12               },

13               "name":                                                     

14               {

15               "codespace":"",

16               "value":""

17               },

18               "geometry":

19               {

20                        "type":"Point",

21                        "coordinates":[48.38290024,-4.49503994]

22               }

23       },

24       "phenomenonTime":"2015-02-03T09:54:12.000Z",

25       "resultTime":"2015-02-03T09:54:12.000Z",

26       "result":{"uom":"m","value":1.76}

27 },


Each block corresponds to a water height for a given date/time.

The important information is:

  • Lines 3 and 4: The number of the observatory (here the identifier is 3 corresponding to BREST);
  • Line 5: the type of data: here WaterHeight/1 = high frequency raw data;
  • Line 21: the coordinates of the site;
  • Line 24 and 25: the date and time of the data in the format:

[year]-[month]-[day]T[hour]:[minutes]:[seconds][time system], with decimal seconds and Z (Zulu) corresponding to UTC;

  • Line 26: the water height in meters.




To find out more


Last updated : 2015 06 01

FAQs on access to tide gauge data REFMAR distributed