Remote Sensing

In contrast to in situ or on-site observation, remote sensing is the collecting of information about an object or phenomenon without making direct contact with it. The method of detecting and monitoring the physical features of a region by measuring its reflected and emitted radiation from a distance, usually via a satellite or aircraft, is known as remote sensing. Active and passive remote sensing are the two forms of remote sensing technology. Active sensors produce energy to scan objects and spaces, after which a sensor detects and measures the reflected or backscattered radiation from the target.