Range Finding

A rangefinder is a device that measures distance from the observer to a target, for the purposes of surveying, navigation, determining focus in photography, choosing a golf club, or accurately aiming a weapon. Some devices use active methods to measure (such as sonar, laser, or radar); others measure distance using trigonometry (stadiametric rangefinders and parallax, or coincidence rangefinders). Older methodologies that use a set of known information, usually distances or target sizes, to make the measurement, have been in regular use since the 18th century. Wikipedia, Rangefinding

See Also

Motion Detection

Created by Dale Pond. Last Modification: Friday March 1, 2013 04:56:06 MST by Dale Pond.