Earth Observing System
The Earth Observing System (EOS) is a program of NASA comprising a series of artificial satellite missions and scientific instruments in Earth orbit designed for long-term global observations of the land surface, biosphere, atmosphere, and oceans. Since the Early 70s, NASA has been developing its Earth Observing System, launching a series of LANDSAT satellites in the decade. Some of the first included Passive-Microwave imaging in 1972 through the Nimbus 5 Satellite. Following the launch of various satellite missions, the conception of the program began in the late 80s and expanded rapidly through the 90s. Since  the inception of the program, it has continued to develop to what we can collect in data today, including; land, sea, radiation and atmosphere. Collected in a system known as EOSDIS, NASA uses this data in order to study the progression and changes in the biosphere of Earth. The main focus of this data collection surrounds climatic science. The program is the centrepiece of NASA's Earth Science Enterprise (ESE).