The  purpose of this  document is  to provide a common  definition  for  basic  entities  managed by  Copernicus Space  Component Ground Segment service elements. These definitions are used  to  derive  the  RESTful Application  Programming  Interfaces  (API)  of  the  GS elements through  which  production,  archival  and distribution of Copernicus Sentinel mission data products may be coordinated.

This  specification drives  the  definition  of the  OData  v4  standard  for  RESTful  APIs for  the  GS  elements, evolving from the v2 standard successfully adopted within the Copernicus Sentinel Data Distribution Service (DHuS) put in place by ESA for the initial missions operations. OData entities and enumerations are detailed, including  applicability  to  GS  elements  and  commonalities.  In  addition,  a  generic  Reporting  interface  is described, intended for the collection of reporting parameters which are expected from each GS element.

The document is intended to compliment the lower-level ‘per-GS element’ ICDs, which describe in more detail the specifics of the OData APIs as applicable to each GS element and any intended sequencing expected to achieve the API objectives. This document is intended to capture the common definition for the basic entities, and is presented as a guideline for the evolution of the lower level ICDs.  In case the APIs within the lower-level ICDs are considered to be further evolved the definitions in this document should be preferred in order to  ensure  a  harmonized  approach  in  the  overall  GS  management avoid  any ad-hoc implementation of  the interfacing between GS elements.