Section 673 - Additional definitions(a) The Vermont State Plane Coordinate System is the most recent system of plane coordinates established by the National Geodetic Survey, based on the National Spatial Reference System, and known as the State Plane Coordinate System, for defining and stating the geographic positions or locations of points within the State of Vermont and shall be known as the Vermont State Plane Coordinate System.(b) For purposes of more precisely defining the Vermont Coordinate System 1927, the following definition by the U.S. Coast and Geodetic Survey (now the National Ocean Service/National Geodetic Survey) is adopted:(c) The Vermont Coordinate System 1927 is a transverse Mercator projection of the Clarke spheroid of 1866, having a central meridian 72 degrees 30 minutes west of Greenwich, on which meridian the scale is set one part in 28,000 too small. The origin of coordinates is at the intersection of the meridian 72 degrees 30 minutes west of Greenwich and the parallel 42 degrees 30 minutes north latitude. This origin is given the coordinates: x = 500,000 feet and y = 0 feet.(d) For purposes of defining the Vermont Coordinate System 1983, the following definition by the National Ocean Service/National Geodetic Survey is adopted. The Vermont Coordinate System 1983 is a transverse Mercator projection of the GRS 80 ellipsoid, having a central meridian 72 degrees 30 minutes west of Greenwich, on which meridian the scale is set one part in 28,000 too small. The origin of coordinates is at the intersection of the meridian 72 degrees 30 minutes west of Greenwich and the parallel 42 degrees 30 minutes north latitude. This origin is given the coordinates: x = 500,000 meters and y = 0 meters.(e) The position of the Vermont Coordinate System 1983 shall be marked on the ground by existing or future survey stations established in conformity with standards adopted by the National Geodetic Survey or its successors for first-order or second-order work, or both, whose geodetic positions have been rigidly adjusted to the North American Datum 1983 (NAD 1983).Amended by 2024 , No. 86, § 1, eff. 3/4/2024.Amended 1987, No. 169 (Adj. Sess.), § 3, eff. 5/3/1988; 1993, No. 6, § 1.