AlTiS data request

Altimetric data for AlTiS software are supplied here.

Please fill in this form in order to be registered as a CTOH data user and be able to get  AlTiS data

  • All fields are required.
  • The extent of the study area has to span less than 30.0 degrees along both longitude and latitude.
  • One area and one altimetric mission by request form.

Personal information
Scientific information
Requested altimetric data   Please check one of the following fields (shown index number, mission name, cycles available, time range, [product name]). For more details about each product :

CTOH AlTiS data use policy


The CTOH (Centre de Topographie des Océans et de l'Hydrosphère) is a French National Observation Service, supported by INSU (Institut National des Sciences de l'Univers). Its role is to assist scientific users and the different space agencies in the development of new altimetric applications. To this end, the CTOH provides access to their frequently updated altimetric data bases, including Topex-Poseidon, Jason-1, Jason-2, Jason-3, GFO, ERS-2, ENVISAT, Sara and Sentinel-3l data, with improved corrections, and to the altimetric products developed by the CTOH.

CTOH products are provided free of charge under the condition that they are exclusively used for scientific studies and experiments. This implies that:

    - Copying the CTOH Products for use by third parties is strictly forbidden.
    - Granting access to the CTOH Products for use by third parties is strictly forbidden.
    - Commercial use of the CTOH products, or products directly derived from them, is strictly forbidden.

The CTOH product may evolve over time.  We also ask that the users communicate to us any problems they find with the data products.

Finally, the data and products are for research purposes. The CTOH cannot be held for responsible for the scientific utilisation of the data.

This dataset can be used freely for any scientific applications provided that one or more of the papers listed below are cited (please choose the most relevant in respect to your application) and  CTOH is acknowledged.

References to cite when using this product:

  • Normandin C., Frappart F.,  Diepkilé A.T., Marieu V., Mougin E. Blarel F., Lubac B., Braquet N. Ba A. (2018). Evolution of the Performances of Radar Altimetry Missions from ERS-2 to Sentinel-3A over the Inner Niger Delta. Remote Sensing, 10(6), 833, doi: 10.3390/rs10060833



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