According to United Nation, the term Remote Sensing means the sensing of the Earth's surface from space
by making use of the properties of electromagnetic waves emitted, reflected or diffracted by the sensed objects,
for the purpose of improving natural resources management, land use and the protection of the environment.
Thus, the technique of acquiring information about an object by a recording device (sensor) that is not in
physical contact with the object by measuring portion of reflected or emitted electromagnetic radiation from
the earth’s surface.