The datasets have been fully reprocessed into a new product which aligns them with the format adopted by the instruments’ successors, Sentinel-3 SLSTR, and includes the following updates from the former L1B datasets [AT1_TOA_1P / AT2_TOA_1P] generated by the ERS ATSR 3rd Reprocessing in 2013:

Improved and extended Level 1B datasets, beginning with recovery of Level 0 data, via the reprocessing of Level 0 data to ungridded brightness temperature (UBT) scenes to Level 1A to retain extra instrument information.

Level 1B products in a Sentinel-SAFE/NetCDF format: a product folder containing NetCDF files and an XML manifest file, holding extensive metadata. This means new information is now available, such as per-pixel uncertainty estimates, associated meteorological data from ECMWF ERA-Interim, instrument scan and pixel quality information, and channel-specific exception and flag values.

Geolocation improvement via orthogeolocation to a Digital Elevation Model.

Improved surface classification via use of the Sentinel-3 Land Water Masks.

Improved cloud information via a latitude correction within cloud look-up tables.