The Auxiliary Data Files (ADF) documentation describes the strategy, structure and format of the auxiliary data required for the generation of Copernicus Earth Observation products within the Earth Observation Processing Framework (EOPF). Auxiliary Data Files include a wide range of static and dynamic information-such as geophysical constants, climatological data, orbit and attitude information, and meteorological inputs-that are essential to correctly process Level-0, Level-1 and Level-2 Sentinel data.
The document explains how the EOPF defines a common and harmonised approach to managing auxiliary data across different missions and processing chains, with the aim of improving consistency, reusability and traceability. It outlines conventions for naming, formatting and accessing ADFs, as well as strategies for sharing common auxiliary datasets among missions. By providing clear guidelines on how auxiliary data is structured, selected and maintained, the documentation supports modular, flexible and on-demand processing while complementing the Core Python Modules and the broader EOPF software ecosystem.