Objective plane

(Perspective)	any plane in the horizontal plane that is represented.
(Surv.)	the horizontal plane upon which the object which is to be delineated, or whose place is to be determined, is supposed to stand.

objective plane

[äb′jek·tiv ′plān] (ordnance) Plane tangent to the ground or coinciding with the surface of the target, especially such a plane at the point of impact of a bomb or projectile.

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