SRAL product example

Altimetry marine products

SRAL product example
SRAL product example

Overview of current and past the Copernicus Sentinel-3 Altimetry marine products.

Last Updated

04 December 2020

Published on

07 July 2020

The marine and land product services for Sentinel-3A and -3B are split between EUMETSAT and ESA, respectively. Users mainly interested in altimeter data over ocean areas will retrieve the data from EUMETSAT; users with a focus on land areas are directed to ESA's data archive. To facilitate the use at the boundary between both realms, an overlap is included.

See full details of see the altimetry marine products entries in the product navigator.


Current altimetry marine/land mask

Since July 2020, with Product Baseline 2.68-MARINE, the L2 SRAL marine product processing contains an updated marine/land mask. This implies minor changes in the geographical coverage of the Marine L2 products, only related to the extension of the coverage from coastline to land; from 10 km to 25 km. The extension also applies to the big inland water bodies already included in the marine L2 products.

New Sentinel-3 Altimetry Processing Baseline released soon - L2 marine products coverage
Figure 1: L2 marine products coverage

Previous altimetry marine/land mask

All L2 products generated before July 2020 have a coverage of 10 km in-land.

The mask used by the respective ground segments differentiates between marine and land products as follows:

  • Marine: all oceans and seas, and the first 10 km in-land.
  • Land: all land and lakes, and coastal areas up to 300 km offshore.

Since December 2017, with Product Baseline 2.24, the L2 SRAL marine product processing contains an updated marine/land mask which added the Great Lakes, Lake Victoria and Caspian Sea to the area covered by the marine products. All reprocessed data have this marine/land mask applied.

The areas covered by the marine and land products and their overlap is illustrated in the image below, also available as a KMZ file.

Sentinel-3 Altimetry Marine Land Mask Product
Figure 2: Example of the Marine/Land Mask product. 0 (blue) = Marine Products only, 1 (green) = Land Products only, 2 (red) = Marine and Land Products.
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