The Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) was a joint-mission between NASA and the French space agency Centre National d'Etudes Spatiales. The main objectives of the mission was to supply unique data set of vertical cloud and aerosol profiles. This was to investigate direct and indirect aerosol forcings; to create better surface and atmospheric radiation flux datasets; and to analyse cloud-climate feedbacks in conjunction with other missions which take part in the A-Train, a group of polar-orbiting satellites passing through equator around 13:30 and 01:30. The satellite of this mission was launched in 28th April, 2006.