Remote sensing

Remote sensing is a branch of science which deals with the art of information collection about an object, area or phenomena through the fine analysis of data acquired by a device which is not in contact with the object, area or phenomena under investigation. The first component required for remote sensing is an energy source for illuminating the object for study. The atmosphere through which energy travels from the target (object) to the sensor also plays a crucial role in remote sensing. Interaction of radiation with the target has a great impact in remote sensing. For the collection and recording of the energy emitted by the target, sensors are used. This recorded energy is transmitted in electronic form to receiving station first and then to processing station. At the processing station, data are converted into appropriate image. Components are required now for interpretation and analysis. Remote sensing which measure naturally available energy are called passive sensors. Remote sensing which provides their own energy source for illumination are known as active sensors.