The SLSTR data format follows the format defined for each Sentinel-3 product, i.e. the PDGS product specification, and is based on SENTINEL-SAFE. Each product package includes:

• a manifest file containing a metadata section and a data object section
• measurement data files
• annotation data files (except for SL_2_WST_)
• representation data files (XML files describing the binary information)(Level-0 only).

User product, generated for operational dissemination to Sentinel-3 users, has to be distinguished from the internal product, which is only used internally for normal processing.

Following the three main processes, there are three main data packages: Level-0, Level-1 and Level-2.

The Sentinel-3 user products are disseminated in Product Dissemination Units (PDU), in order to ease the online dissemination and data handling for the users.

The PDU is a portion of data and is defined per product type.

Table 1: Description and content of the different SLSTR product packages, the estimated size corresponds to a full orbit without consideration about compression, NRT/NTC less than 3/48 hours after measurement by satellite.