Minimize Level-2 WCT

The Level-2 WCT product (not disseminated to users) gathers Sea Surface Temperature (SST) on single and dual view, derived from weighted combinations of brightness temperatures measured in nadir and oblique thermal channels:

  • 1 km N2 SST dataset is performed using nadir single view and only two thermal channels (channels S8 and S9, i.e. 10.85 and 12 µm) during day-time retrieval
  • 1 km N3 SST dataset is performed during night-time retrieval using across track single view and all thermal channels (included S7, i.e. 3.7 µm)
  • 1 km N3R SST dataset is similar to N3 but using the property of "aerosol robustness" and its associated method described by Merchant et al (1999)
  • 1 km D2 SST dataset is similar to N2, except that dual view (across and along track) is used
  • 1 km D3 SST dataset is similar to N3, except that dual view is used.

These five SST measurement datasets are generated on the wide 1 km measurement grid and indexed by across track and along track dimensions. In addition to SST, the Level-2 WCT provides the SST uncertainties and exception flags derived from SLSTR Level-1 product.

The Level-2 WCT also includes parameters directly taken from SLST Level-1 product, associated to re-gridded and orphan pixels:

  • quality flags concerning cloud flagging and scan and flip mirror testing
  • arrays of indices to retrieve the position of each pixel in the instrument measurement frame and their time stamps
  • cartesian and geodetic coordinates associated to the radiometric measurements and to the tie-points grid defined for SLSTR
  • meteorological annotations.