target—¹Something that is or may be aimed at. ² An object which reflects a sufficient amount of radiated signal to produce an echo signal on detection equipment.

target, photographic— A symmetrical pattern centered over a station market which reflects light from it’s surface in a uniformly symmetrical manner to where it it transmitted through a lens to a photographic emulsion, without detectable distortion with respect to images of adjacent objects or ground details; signals, panels.

target rod— See leveling rod.

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Source: NSPS “Definitions of Surveying and Related Terms“, used with permission.

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