Processing Overview

Level-0 processing aims to generate time sorted and annotated Level-0 data products from Instrument Source Packets (ISP).

The first part of processing involves unpacking the ISP, performing a quality check and appending annotation data. Once the input raw data files have been read, all necessary data are extracted and parsed. The ISPs are then sorted and checked. This includes checks for missing and duplicate packet numbering.

The final part of the processing is Level-0 product generation. Several quality flags are computed and included in the associated metadata and the time sorted and annotated raw data are included in the Level-0 package.

During Level-0 processing, several activities have to be completed:

  • Leap second management should be handled.
  • Product quality flags should provide information concerning nominal processing, satellite manoeuvring, contingency processing and degraded processing.
  • The total number of missing ISPs should be reported.
  • No duplicated packets should be included in Level-0 products.