Remote sensing

Remote sensing

The process of using aerial sensor technologies to detect and classify objects on Earth both on the surface, and in the atmosphere and oceans by means of propagated signals.

Industry: Earth science

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Remote sensing

Angular beam width

Earth science; Remote sensing

In radar, the angle subtended in the horizontal plane by the radar beam.

Pushbroom system

Earth science; Remote sensing

An imaging device consisting of a fixed linear array of many sensors which is swept across an area by the motion of the platform, thereby building up an image. It relies on sensors whose response ...

Data collection system (DCS)

Earth science; Remote sensing

On Landsats 1 and 2, the system that acquired information from seismometers, flood gauges, and other measuring devices. These data were relayed to ground receiving stations.

Difference image

Earth science; Remote sensing

Image prepared by subtracting the digital values of pixels in one image from those in a secon image to produce a third set of pixels. This third set is used to form the difference image.

F-stop

Earth science; Remote sensing

Focal length of a lens divided by the diameter of the len's adjustable diaphragm. Smaller numbers indicate larger openings, which admit more light to the film.