N.Y.C. Admin. Code § 25-104: § 25-104 Official surveying stations.

The latitudes and longitudes determined in conformity with the method used by the United States coast and geodetic survey for primary stations; the rectangular spherical coordinates for secondary stations; and the rectangular co-ordinates referring to a given fixed central meridian, or assumed meridian, for all stations, shall continue to be official and binding upon all officers making any map or plan relating to any borough, or part thereof.