Along-Track Scanning Radiometer (ATSR) mission was 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 ATSR1 product [AT_1_RBT] in NetCDF format stemming from the 4th AATSR reprocessing, is a continuation of Earth Resource Satellite (ERS) ATSR data and a precursor of Sentinel-3 SLSTR data. It has replaced the former L1B product [AT1_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 reprocessed data includes improvements to calibration and data format.

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