The Along-Track Scanning Radiometer (ATSR) missions were funded jointly by the UK Department of Energy and Climate Change External Link (DECC) and the Australian Department of Innovation, Industry, Science and Research External Link (DIISR).

This ATSR 2 product [AT_1_RBT] in NetCDF format stemming from the 4th AATSR reprocessing, is a continuation of Earth Resource Satellite (ERS) ATSR 1 data and a precursor of Sentinel-3 SLSTR (Sea and Land Surface Temperature Radiometer) data. ATSR2 is an evolution of ATSR1 in that it has additional visible and IR channels. This AT_1_RBT product replaces the former L1B product [AT2_TOA_1P] in Envisat format from the 3rd reprocessing. Users with Envisat-format products are recommended to move to the new Sentinel-SAFE like/NetCDF format products. The 4th reprocessing of Envisat AATSR data was completed in 2022.

The data were acquired by the European Space Agency's (ESA) Envisat satellite, and the Centre for Environmental Data Analysis (CEDA) mirrors the data for UK users.