Level-0 Processing Overview
The Level-0 product is raw image data (on-board compressed) in raw Instrument Source Packet (ISP) format. It is initially processed to safeguard the integrity of the Near-Real-Time-acquired data. As summarised in Figure 1 this operation includes:
Level-0 Processing Workflow
Level-0 Consolidation Processing
As highlighted previously, the Level-0 initial processing, performed to preserve the integrity of the acquired data, occurs in real-time (i.e. in parallel to data reception). By contrast, Level-0 consolidation and downstream processing activities (i.e. to Level-1) are delayed until triggered by the recovery on-ground of the ancillary data. This occurs at the end of every satellite pass. Ancillary data are ingested together with the MSI raw data at the beginning of the Level-0 consolidation processing collates and appends all necessary metadata required for archiving and onward processing to Level-1.
The position of these initial processes can be seen in the middle of Figure 1, up to the output block named Level-0 (Consolidated).