Earth observation (EO) is the gathering of information about planet Earth’s physical, chemical and biological systems. It involves monitoring and assessing the status of, and changes in, the natural and manmade environment. Today’s EO instruments include:
- floating buoys for monitoring ocean currents
- temperature and salinity
- land stations that record air quality and rainwater trends
- sonar and radar for estimating fish and bird populations
- seismic and Global Positioning System (GPS) station
- satellites that scan the Earth from space.