Remote Sensing is a technology to gather information and analyze an object or phenomenon without making any physical contact. This technology is used in numerous fields like geography, hydrology, ecology, oceanography, Glaciology, geology.By measuring the radiation that a region emits and reflects from a distance, remote sensing is the process of identifying and keeping track of the physical properties of a location. Remotely sensed photos are captured by specialized cameras and are used by scientists to "sense" the Earth.It substitutes for slower, more expensive on-the-ground data collecting by providing quick, repetitive coverage of very vast areas for daily applications like weather predictions or reports on natural disasters or climate change.