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About: Alidade     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : dbo:Device, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: Thingdevice New Facet based on Instances of this Class

An alidade (/ˈæ.lɪ.deɪd/) (archaic forms include alhidade, alhidad, alidad) or a turning board is a device that allows one to sight a distant object and use the line of sight to perform a task. This task can be, for example, to triangulate a scale map on site using a plane table drawing of intersecting lines in the direction of the object from two or more points or to measure the angle and horizontal distance to the object from some reference point's polar measurement. Angles measured can be horizontal, vertical or in any chosen plane.