Minimize Data Products

The SENTINEL-4 L1b products include Earth radiance, Sun irradiance, DPPF (Data Processing Parameter File), stars data, and calibration products. Amongst these products, Earth radiance, Solar irradiance, and DPPF (to be confirmed) products are distributed to all users, whereas the other products are only available to Expert Users (users such as academics and industrial software engineers who have previous experience of similar EO missions, and an in-depth experience of data manipulation and management will be able to engage with ESA via the Technical Wiki, and the Product Control Service).

Table 1 lists the SENTINEL-4 Level-1B products.


SENTINEL-4

Level-1B product

Parameter(s)

Distributed

Earth Radiance

Spectrally and radiometrically calibrated and geo-located Earth radiance

to all users

Solar Irradiance

Spectrally and radiometrically calibrated  Solar irradiance

to all users

DPPF

 Data Processing Parameters

to Expert Users

Calibration

Calibration data.

to Expert Users

Star

Star calibration data

to Expert Users

Diagnostic

Instrument diagnostic data

to Expert Users

Table 1: SENTINEL-4 Level-1B products

The SENTINEL-4 Level-0 to Level-1B data processing software in the MTG ground segment's IDP performs a number of key tasks:

  • Process Level-0 data into Level-1b data products;
  • Provide, in the level-1b data products, quality information on individual pixel level, spectrum level (per north-south viewing direction) and measurement level;
  • Provide Level-1b data product metadata that allows fast and efficient searching of the data;
  • Analyse and process all required measurement data in order to provide the necessary information to allow monitoring the performance and calibration of the instrument and its data products;
  • Enable the calculation of new calibration key parameters (key data) for accurate Level-0 to Level-1B data processing of subsequent measurement data.

The SENTINEL-4 Level-2 products are to be ready at the end of commissioning (i.e. day-1). The Level-2 data fields, field names, metadata, etc., will be defined per Level-2 product in the framework of ESA's Level-2 processor development for SENTINEL-4, in line with the NetCDF Climate and Forecast (CF) Metadata Convention elaborated in the framework of MTG, and the INSPIRE (Infrastructure for Spatial Information in the European Community) Metadata Regulation convention. Table 2 lists the SENTINEL-4 Level-2 products.

SENTINEL-4

Level-2 products

Parameter(s)

Distributed

O3

Ozone (O3) total column, tropospheric sub-column,

to all users

NO2

Nitrogen dioxide (NO2) total column, tropospheric sub-column

to all users

SO2

Sulfur dioxide (SO2) total column

to all users

HCHO

Formaldehyde (HCHO) total column

to all users

CHOCHO

Glyoxal (CHOCHO) total column

to all users

Cloud

Cloud optical thickness, fraction, altitude

to all users

Aerosol

Aerosol column optical thickness, type, layer height, absorbing index

to all users

Surface

Surface and aerosol characteristics

to all users

Table 2: SENTINEL-4 Level-2 products

All Level-2 products depend on SENTINEL-4 L1b radiance and irradiance data. For the generation of the Level-2 products in the MTG ground segment's L2P the following external auxiliary input are required:

  • Pressure, temperature, humidity, and density fields from forecast data (in the case of forward processing) or from re-analysis data (in the case of reprocessing) from ECMWF (preferred option), or from a climatology (fall-back option);
  • A static digital elevation model (to be specified);
  • NO2 and O3 data used as a-priori information for the NO2 and O3 products from chemical forecast model fields e.g. from the Copernicus Atmosphere Monitoring Service (preferred option) or from a climatology (fall-back option);
  • Sbow / ice flags included in the SENTINEL-4 L1b radiance product.

The FCI Level-2 Cloud Mask (Scenes Analysis) and Cloud Analysis product (SCE/CLA) or the FCI Level-2 Optimal Cloud Analysis (OCA) products are foreseen as possible optional inputs to the SENTINEL-4 Level-2 processing. The usage of flags from the FCI SCE/CLA product has the potential of enhancing cloud and aerosol screening. The usage of the FCI OCA cloud product has the potential of enhancing the scattering correction in trace gas retrievals.