Remote Sensing (RS) is the acquiring of Data about an object without touching it.
Remote Sensing is the art and science of obtaining information about an object or feature without physically coming in contact.
The data collected can be of many forms: variations in acoustic wave distributions (sonar), force distributions (gravity meter), electromagnetic energy distributions (eye), etc.
The Remote Sensing process of inferring surface parameters from measurements of the Electromagnetic Radiation (EMR) from the Earth’s surface
Electromagnetic Radiation(EMR) or Electromagnetic energy is the energy propagated in the form of an advancing interaction between electric and magnetic fields
The Electromagnetic Spectrum is represented by Electromagnetic waves. It’s characterized by their wavelength or frequency, linked by the speed of light.
In the case of Active Remote Sensing, energy is generated and sent from the RS platform towards the targets
Passive Remote Sensing, source of energy is that naturally available such as the Sun.
Thre are three types of platform-
Land use planning
Water source management
Provides data from large areas
Easy and rapid collection of data
Provides data of very remote and inaccessible regions
The interpretation of imagery requires a certain skill level
Needs cross verification with ground (field) survey data
Data from multiple sources may create confusion