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
The field of view (FoV) is the extent of the observable world that is seen at any given moment. In the case of optical instruments or sensors it is a solid angle through which a detector is sensitive to electromagnetic radiation.
Human ...
(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.
See also
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Panorama
A panorama (formed from Greek πᾶν "all" + ὅραμα "view") is any wide-angle view or representation of a physical space, whether in painting, drawing, photography, film, seismic images, or 3D modeling. The word was originally coined i ...
References
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Optoelectronics
Radar
Avionics
Vision
Tracking
Science of photography