The Comprehensive Large Array-data Stewardship System (CLASS) is designed to support long-term, secure preservation and standards-based access to environmental data collections and information. Developed by NOAA, CLASS distributes NOAA and US Department of Defense (DoD) Polar-orbiting Operational Environmental Satellite (POES) data, NOAA's Geostationary Operational Environmental Satellite (GOES) data, and derived data.