The OLCI Level-2 product is composed of four packets, all available to the user depending on processing parameters.
Each is composed of an information package map, also called a manifest, and several measurement and annotation data files.
The manifest file is written in XML and contains general information concerning the product and processing. The measurement and annotation data files are written in netCDF 4 format and include dimensions, variables and associated attributes.
The OL_2_WFR and OL_2_WRR packages include 24 measurement data files and seven annotations data files. The measurement files include 16 files containing water-leaving reflectances and their error estimates for all bands, except those dedicated to measurement of atmospheric gas (Oa13 to Oa15, Oa19 to Oa20). These files are produced on the product grid.
The other measurement files provide several marine and inland water products and associated error estimates:
The annotation files are similar to those included in OL_1_EFR and OL_1_ERR except the quality flags file is renamed "WQSF" (Water Quality and Science Flags).
The OL_2_LFR and OL_2_LRR packages include three measurement data files and eight annotation data files. The measurement files provide the OLCI Global Vegetation Index (OGVI), the OLCI Terrestrial Chlorophyll Index (OTCI) and the Integrated Water Vapour (IWV) column. Each parameter is associated with error estimates and computed on the product grid.
The annotations files are similar to the ones included in OL_1_EFR and OL_1_ERR, but:
The Level-2 Land Product Data Format Specification document contains more detailed information.
OLCI Processing Baseline Timeline
OLCI Level-1 and Level-2 Processing Baseline
Table 1: OLCI L1 and L2 Processing Baseline
Processing Baseline 2.29 – March 2018
Introduction of a self-sending Radiometric Model (including a long-term instrument sensitivity evolution term) to OLCI radiometric calibration.
Processing Baseline 2.23 – Oct/Nov 2017
Processing Baseline 2.16 – March 2017