Minimize Level-1

The SLSTR Level-1 product package is composed of one information package map, also called a manifest, and several measurement and annotation data files (between 77 and 111 files depending on the processing parameters).

For measurement files, SL_1_RBT, the Level-1B product includes between 22 and 34 radiance and brightness temperature measurements datasets. For nadir and oblique views, there is:

  • one dataset for each channel S1 to S3, corresponding to A stripe
  • up to three datasets for each SWIR channel S4 to S6, corresponding to A, B or TDI stripe
  • one dataset for each thermal infra-red channel S7 to S9
  • one dataset for each fire channel F1 and F2.

They contain, for each pixel on the full resolution grid and for each un-regridded pixel (also called orphan pixels), the radiance or brightness temperature and their associated exception flags. These files are all written in netCDF 4 format and include dimensions, variables and associated attributes.

Annotation data files are also written in netCDF 4 format. Their number and dimensions are described in the following table:

File Name Dimensions  
Infrared Quality Full resolution line; detectors and integrators One for each view, for each channel and for each selected stripe
Global Flags Data file Full resolution pixel grid and orphan pixels One for each view and for each selected grid
Scan, pixel and detector number Full resolution pixel grid and orphan pixels One for each view and for each selected grid
FR Cartesian Coordinates Full resolution pixel grid and orphan pixels One for each view and for each selected grid
Tie points Cartesian Coordinates Tie-point grid (1 km along-track and 16 km across-track) One file
FR Geodetic Coordinates Full resolution pixel grid and orphan pixels One for each view and for each selected grid
Tie points Geodetic Coordinates Tie-point grid (1 km along-track and 16 km across-track) One file
Time Full resolution line One for each selected grid
Tie points Solar and Satellite Geometry Tie-point grid (1 km along-track and 16 km across-track) One for each view
Meteorological Parameters Tie-point grid and specific meteorological dimensions One file

Table 1: Description of the annotation data files included in the SLSTR Level-1 product

Associated with these files, an information package map describes, for each Level-1 file, the content unit identifier and description, and the type of data contained in each file.

A manifest file in XML format gathers together metadata associated with the instrument and the processing.