Iowa Code § 355.16: Iowa plane coordinate system defined.

The Iowa plane coordinate system may be used for the purpose of conducting official surveys, as defined by the United States national geodetic survey or a successor agency. As used in this section, “Iowa plane coordinate system” means the system established by 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 that is in use at the time the survey is performed.