NOTE: OLCI Level-0 products are internal products only. They are not distributed to SENTINEL-3 users.

The OLCI Level-0 product is composed of three different packages:

• The OL_0_EFR package contains the full resolution ISPs raw data (time-sorted and annotated).
• The OL_0_CR0 package contains parameters from the calibration processing, computed with no spectral relaxation, i.e. with data acquired at 46 micro-bands.
• The OL_0_CR1 package contains parameters from the calibration processing, computed with spectral relaxation, i.e. with data acquired at 22 bands.

The content and the format of each Level-0 product are similar for these three packages.  Each package includes a manifest file and several data files. The only difference is the size, since the calibration processing is limited to 1 500 frames.

The manifest file is written in XML and contains information such as identifiers, or textual descriptions, concerning the product and the processing.

The measurement data file is a binary file containing the time-ordered raw data contained previously in the ISP. The content is the same as the ISP downlinked from the spacecraft platform to the receiving Ground Station. A selection is performed to discard duplicated and corrupted packets from the Level-0 product.

Two annotations data files are included in the Level-0 product: the ISP annotation data file and the OnLine Quality Control (OLQC) report. The ISP annotations data file includes time stamps, and ISP and Front End Processor (FEP) annotations.

Two representation data files are included in the OL_0_EFR product. These files describe in XML schema, the format of the measurement data file and of the ISP annotation data file.