Energy measuring is a term used to describe the light and radio waves, X-rays, and other forms of energy that transmitted through space as electromagnetic waves
Geographic information system (GIS) is a term used to describe a computer-based system for storing, manipulating, and analysing data associated with particular geographic locations.
REMOTE SENSING DIAGRAM
Microwaves are electromagnetic waves with wavelengths ranging from as long as one meter to as short as one millimetre, or equivalently, with frequencies between 300 MHz (0.3 GHz) and 300 GHz.
Remote sensing is the art or science of telling something about an object without touching it (reconnaissance at a distance) It includes various methods of obtaining pictures or other forms of electromagnetic records of the Earth’s surface from a distance and the treatment and processing of the picture data.