center line—See line, center.

center line of section [USPLS]—The line connecting opposite corresponding quarter corners or opposite subdivision-of-section corners or their theoretical positions.

center line of street—Center line of a street usually applies to the center of a street prior to widening, or closing; i.e., the center line of the original street midway between the sides. To avoid ambiguous conditions, if the street has been narrowed or widened on one side or unequally, the center line would be defined such as the center line as existing on on a particular date, e.g., 11/22/62.

center line of strip—The center line of a strip of land with a specific width. Commonly used to describe strips intended to be used as easements, either public or private, for right of way or utility purposes.

center of circle—The point at which the radii meet and which is the origin of all radial lines.

center of instrument-¹The point on the vertical axis of rotation of an instrument which is at the same elevation as the axis of collimation when that axis is in a horizontal position. ² In a transit or theodolite, the center is close to, or at the intersection of the horizontal and vertical axes of the instrument.

center of section—The point formed by lines connecting opposite quarter corners in a section of land; the center quarter corner.

center of transit or level—A manufacturer’s term for spindles which are in a vertical position when the instrument is in use, and about which the instrument, or part of the instrument, rotates. The engineer’s transit has two such centers: An inner center to which the alidade is attached, and an outer center to which the horizontal circle is attached; it is hollow and rotates on the inner center. The rotation of the alidade is called the upper motion, and the rotation of the horizontal circle, the lower motion of the instrument.

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

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