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ESA Sea State Climate Change Initiative (Sea_State_cci) : Global remote sensing daily merged multi-mission along-track significant wave height from altimetry, L3 product, version 3

Update Frequency: Not Planned
Latest Data Update: 2022-09-30
Status: Completed
Online Status: ONLINE
Publication State: Citable
Publication Date: 2022-10-10
DOI Publication Date: 2022-10-11
Download Stats: last 12 months
Dataset Size: 6.93K Files | 57GB


The ESA Sea State Climate Change Initiative (CCI) project has produced global daily merged multi-sensor time-series of along-track satellite altimeter significant wave height data (referred to as Level 3 (L3) data) with a particular focus for use in climate studies.

This dataset contains the Version 3 Remote Sensing Significant Wave Height product, which provides along-track data at approximately 6 km spatial resolution. It has been generated from upstream Sea State CCI L2P products, edited and merged into daily products, retaining only valid and good quality measurements from all altimeters over one day, with simplified content (only a few key parameters). This is close to what is delivered in Near-Real Time by the CMEMS (Copernicus - Marine Environment Monitoring Service) project. It covers the date range from 2002-2021.

The altimeter data used in the Sea State CCI dataset v3 come from multiple satellite missions (Envisat, CryoSat-2, Jason-1, Jason-2, Jason-3, SARAL, Sentinel-3A), therefore spanning over a shorter time range than version 1.1. Unlike version 1.1, this version 3 involved a complete and consistent retracking of all the included altimeters. Many altimeters are bi-frequency (Ku-C or Ku-S) and only measurements in Ku band were used, for consistency reasons, being available on each altimeter but SARAL (Ka band).

Citable as:  Piollé, J.-F.; Dodet, G.; Quilfen, Y. (2022): ESA Sea State Climate Change Initiative (Sea_State_cci) : Global remote sensing daily merged multi-mission along-track significant wave height from altimetry, L3 product, version 3. NERC EDS Centre for Environmental Data Analysis, 11 October 2022. doi:10.5285/e6af67fca81c40b7bb3eddaadde06909.
Abbreviation: Not defined
Keywords: Sea State, CCI, Significant Wave Height


Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
Access rules:
Public data: access to these data is available to both registered and non-registered users.
Use of these data is covered by the following licence: When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data was produced by the ESA Sea State CCI team at Ifremer and was transferred to CEDA as part of the ESA CCI Open Data Portal project.

Data Quality:
This product is a subset of the L2P products whose data were quality checked and compared to in situ reference data. For more details on the validation process, refer to the product user guide.
File Format:
Data are in NetCDF format

Process overview

This dataset was generated by a combination of instruments deployed on platforms and computations as detailed below.

Computation Element: 1

Title Derivation of ESA Sea State Climate Change Initiative (Sea_State_cci): Global remote sensing multi-mission along-track significant wave height from altimetery, version 3 datasets
Abstract For information on the derivation of the Sea_State_cci Global remote sensingmulti-mission along-track significant wave height from altimetery version 3 products please see the product user guide.
Input Description None
Output Description None
Software Reference None
Output Description


  • units: m
  • long_name: Ku band adjusted significant wave height
  • standard_name: sea_surface_wave_significant_height
  • var_id: swh_denoised
  • units: dB
  • var_id: sigma0
  • standard_name: surface_backwards_scattering_coefficient_of_radar_wave
  • long_name: Ku band backscatter coefficient
  • units: m
  • var_id: swh
  • standard_name: sea_surface_wave_significant_height
  • long_name: Ku band significant wave height
  • units: m
  • long_name: best estimate of significant wave height standard error
  • var_id: swh_uncertainty
  • var_id: cycle_number
  • long_name: cycle number of satellite associated with measurement
  • units: m
  • long_name: distance to nearest coast
  • var_id: distance_to_coast
  • units: m
  • var_id: bathymetry
  • long_name: ocean depth
  • standard_name: sea_floor_depth_below_mean_sea_level
  • long_name: relative pass number of satellite associated with measurement
  • var_id: relative_pass_number
  • long_name: satellite associated with measurement
  • var_id: satellite

Co-ordinate Variables

  • units: degree_north
  • standard_name: latitude
  • var_id: lat
  • units: degree_east
  • standard_name: longitude
  • var_id: lon
  • standard_name: time
  • var_id: time
  • units: seconds
  • long_name: time of measurement
Temporal Range
Start time:
End time:
Geographic Extent