The field of regard (abbreviated FOR) is the total area that can be captured by a movable sensor. It should not be confused with the
field of view (FOV), which is the angular cone perceivable by the sensor at a particular time instant. The field of regard is the total area that a sensing system can perceive by pointing the sensor, which is typically much larger than the sensor's FOV.
For a stationary sensor, the FOR and FOV coincide (i.e. FOR=FOV).
See also
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Panorama
References
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Optoelectronics
Radar
Avionics
Vision
Tracking
Science of photography