ABSTRACT
Remote sensing is generally defined as a method for collecting information about something, using an instrument that is not in contact with it. Thus, remote sensing is essentially the detection and measurement of electromagnetic radiation either reflected or emitted from a distant object. Galileo's eye was a remote sensing instrument when he first observed the moons of Jupiter through his telescope. The most common use of the term today is for space-based systems that collect images of the earth. Remote sensing has become critical for many different disciplines such as meteorology, archeology, forestry, geology, monitoring of the environment, and for military applications.
