Auxiliary Data Gathering

The processing of the acquired satellite data requires a number of auxiliary information, not included in the satellite telemetry. This encompasses different types of auxiliary information from different sources:

  • Regularly updated auxiliary files related to the instrument and processing configuration information, updated regularly on a need basis. These files are typically generated as part of the Cal/Val operations and used for the Level-1 production and Level-2 production.
  • Dynamic auxiliary information generated by external entities (e.g. ECMWF, Ifremer, etc.), systematically renewed with a known frequency. This information is often available in a heterogeneous format and requires reformatting before it can be used for the Copernicus production operations.
  • Dynamic auxiliary data from FOS (e.g. orbital info), systematically renewed with a known frequency.
  • Dynamic auxiliary orbit and attitude information generated by the Precise Orbit Determination service, systematically renewed with a known frequency.
  • Static and semi-statis auxiliary files, required by the data processor an updated rarely through the mission.

Production operations require access to these various types and sources of auxiliary data. In order to optimise the effort related to the auxiliary data management and ensuring coherence among all services requiring the use of auxiliary information, a single auxiliary data collector and reformatting is considered within the Copernicus Ground Segment Architecture. The Auxiliary Data Gathering Service acts as a concentrator and single point of access for auxiliary data for all systematic production within the Copernicus Operations. In case timeliness to specific auxiliary data is of essence for some specific production operations (e.g. access to POD for Sentinel-1 production operations), the relevant auxiliary files may overpass the ADG. Static and semi-static auxiliary data are instead managed in configuration control with the processing software (through a dedicated environment within the Reference System).

The Auxiliary Data Gathering Service covers the following key functions:

  • Collection of auxiliary data from the different sources (e.g. Cal&Val component, Flight Operations Segment, ECMWF, Ifremer, etc.) in line with the operational needs of the various Copernicus missions
  • Reformatting of the external auxiliary data in line with the CSC GS interfaces
  • Gathering of auxiliary data generated by the Cal&Val service for production operations
  • Repository of auxiliary data interface point
  • Operations and management of the Auxiliary Interface Point, including a rolling repository to support retrieval of auxiliary data from the various consumers (e.g. systematic production service, on-demand production service, Data Access and LTA service). By configuration, for some auxiliary data types, the full historic set will be maintained within the AUXIP without a rolling policy.

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