355.16  Iowa plane coordinate system defined.
  As used in this section, and sections 355.17 through 355.19, unless the context otherwise requires, “Iowa plane coordinate system” or “coordinate system” means the system of plane coordinates established by the United States national ocean survey, or the United States national geodetic survey, or a successor agency, for defining and stating the geographic positions or locations of points on the surface of the earth within the state of Iowa.
93 Acts, ch 50, §1