RADAR is a widely known form of active remote sensing. You cannot see at night if the room lights are not turned on.Īctive remote sensing instrumentation includes the energy source on which the measurement is based.
The eye and optical telescopes are passive remote sensors: they rely on an external light source. Passive remote sensors do not include the energy source on which the measurement is based. There are two classes of remote sensors: passive remote sensors and active remote sensors. Smooth local fluctuations by averaging over a large volume.Probe large volumes economically and quickly, such as providing global measurements of aerosols, air pollution, agriculture, human impact on the environment, ocean surface roughness, and large scale geographic features.Measure a process without disturbance, such as monitoring flow around an aircraft model in a wind tunnel or measuring temperature during an experiment.
Avoid hazardous or difficult to reach regions, such as inside nuclear or chemical reactors, in biological hot spots, behind obstacles, inside smoke stacks, on the freeway, in the ocean depths, on mountain tops, in polar regions, on other planets, or on the sun.Optical and radio elescopes, cameras, even eyesight, are types of remote sensing with which you are probably familiar.īecause the remote sensing instrumentation is not in contact with the object being observed, remote sensing allows the monitor to: Remote sensing is any technique for measuring, observing or monitoring a process or object without physically touching the object under observation.
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