Operational release of value-added Sentinel-3A Corrected Sea Surface Height products

New Sentinel-3A Corrected Sea Surface Height products will be available on EUMETCast from 27 June.

Thursday, 22 June 2017

Operational release of value-added Sentinel-3A Corrected Sea Surface Height products

These new products Corrected Sea Surface Height in NRT — Sentinel-3 and Corrected Sea Surface Height in STC - Sentinel-3, called ‘L2P SLA’ in short, are processed by the Sentinel-3 L2P/L3 Marine Altimetry Service (CNES/CLS), in the frame of a EUMETSAT contract, funded by the European Union.

The products are derived from the dual-frequency Synthetic Aperture Radar Altimeter (SRAL) instrument onboard Sentinel-3. They are mono-mission global products, containing 1 Hz along-track corrected sea surface heights with respect to a mean sea surface, corrections and geophysical parameters. The last versions of altimetric standards are used and there is a homogenised format for all satellites. They are generated in Near-Real Time (NRT) and Short-Time Critical (STC) timeliness. The L2P SLA products are distributed in the user friendly NetCDF format.

The added value compared to level 2 products:

  • The update of geophysical standards to calculate sea level anomalies, such as:
    • FES2014 ocean tide.
    • CNES/CLS 2015 mean sea surface referenced to a 20 year reference period.
    • Filtered ionospheric correction.
    • Dynamical atmospheric correction for L2P NRT products (instead of only inverted barometer height correction in the case of L2 NRT products).
  • A validity flag to remove spurious measurements
  • The distribution of L2P SLA near real time products split in passes (instead of 10 minute granules for L2 near real time products).

Along-track Level-2+ (L2P) SLA Sentinel-3A Product Handbook

The products will be distributed on EUMETCast Europe:

Channel: E1H-S3A-07
PID: 601
Multicast Address:

Example filenames:

NRT product: global_sla_l2p_nrt_s3a_C0017_P0131_20170426T105900_20170426T110534_20170426T124248.nc.gz

STC product: global_sla_l2p_stc_s3a_C0017_P0049_20170423T135818_20170423T144623_20170425T080723.nc.gz

The L2P SLA products have been available from AVISO+ product webpage, as a pre-operational service. They will continue to be accessible from there. In addition, the L2P SLA in Non-Time Critical (NTC) timeliness will also be made available via AVISO+ from 27 June.

In the near future, these products will also be available via CODA (Copernicus Online Data Access service) and the EUMETSAT Data Centre.

In addition to the L2P, also L3 Products will be operationally released from 27 June. These are global along-track products that contain time, sea level anomaly and absolute dynamic topography, only for valid marine surfaces. The L3 products have undergone a multi-mission cross-calibration process versus a reference mission (Jason-3). These products are distributed by CMEMS.

L3 Product User Manual

To learn more about the Copernicus Altimetry products we provide, see the Altimetry webpage.

Users wishing to receive the new L2P SLA (NRT and STC) products through EUMETCast should register via our Earth Observation Portal (EOP).

For more information, contact our User Service Helpdesk.


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