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1 Introduction

1.1 Purpose and Scope

The scope of this document is to be used as an annex for the CSC Common Entity Definition Document [RD-3] in order to describe the Product Entity Properties, the Product Attributes and the corresponding metadata elements that shall be catalogued and queryable for Sentinel products. This document provides the mapping and packaging format for the Sentinel-3 products.

1.2 Applicable Documents

Table 1-1 – Applicable Documents

1.3 Reference Documents

Table 1-2 – Reference Documents

1.4 Acronyms and Abbreviations

Table 1-3 – Acronyms and Abbreviations

1.5 Definitions

Auxiliary Data – Data which enhance processing and utilization of remote sensing instrument data. The auxiliary data are not necessarily captured by the same data collection process as the instrument data. Auxiliary data include data collected by any other platform or process (e.g. meteorological data from ECWMF or NCEP), data providing processing configuration information typically for data calibration and or instrument characterisation (e.g. processing auxiliary files), and data providing information on satellite position and velocity (orbit auxiliary files). Auxiliary data help in data processing but are also data sets in their own right and may be relevant for end-users in specific User Level Data exploitation scenarios.

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2 sentinel-3 Products and Auxiliary Data

2.1 Sentinel-3 Product List

[AD-1] describes the list of Sentinel-3 products which are required to be circulated within the Copernicus Space Component (CSC) Ground Segment (GS) elements (e.g. from Systematic Production to Long Term Archiving or Data Access systems).

Products that are disseminated are cut in accordance with "Product Dissemination Units" as described in the Product Units Configuration documentation [RD-7] and [RD-8].

2.2 Sentinel-3 Product Packaging

All Sentinel-3 products follow the corresponding Product Format Specifications and are packaged as non-compressed ‘zip’ packages.

2.3 Sentinel-3 Auxiliary Data List

[AD-1] presents the list of Sentinel-3 Auxiliary Data which are required to be circulated between the CSC GS elements. It must be noted that Sentinel-3 Auxiliary files data set content may change with new processing baselines and therefore, the list provided in [AD-1] is subject to change over time.

3 sentinel-3 product entity properties mapping

[RD-3] defines the Generic CSC Common Entity Properties. Table 3-1, below, provides the mapping between these Generic Product Entity Properties and the Sentinel-3 product metadata. Most of the properties defined in [RD-3] are generated by the CSC services. The following table describes the properties that map directly to the Sentinel-3 product metadata.

Table 3-1 – Sentinel-3 Product Entity Properties mapping to Sentinel-3 metadata

*n/a = not available

4 sentinel-3 Product Attributes Mapping

All relevant metadata elements of the Sentinel-3 products shall be indexed in the Product Attributes, additional metadata elements may also be identified if appropriate. In order to provide a harmonised model across the Sentinel missions the JSON property naming from [RD-4] is preferred for the Attribute Names. In case an attribute is not defined in [RD-4] the naming used in the mission specific metadata files, harmonised across the Sentinel missions, is preferred. The Product Attributes mapping for all Sentinel-3 products is described in the Excel file “Sentinel-3 Product Attributes Mapping”, which is packaged with this document. A summary of the Sentinel-3 Product Attributes mapping across all Sentinel-3 products is presented in Table 4-1 below. It should be highlighted that, in order to harmonise the metadata model across the Sentinel missions, in some cases an “alias” for the value defined in the Sentinel-3 metadata is mapped to a standardised value to be used by the CSC GS elements, in other cases a standard value is defined where it is otherwise unavailable from the product.

Table 4-1 – Sentinel-3 Product Attributes mapping