Definition of the term 'radial displacement ' per official documentation of the United States Department of Defense.
radial displacement
(*) On vertical photographs, the apparent ?leaning out,? or the apparent displacement of the top of any object having height in relation to its base. The direction of displacement is radial from the principal point on a true vertical, or from the isocentre on a vertical photograph distorted by tip or tilt. (US DoD)
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