765 ILCS 226/5
As used in this Act:
"Committee" means the Illinois Coordinate System Committee.
"Illinois Coordinate System" means a collection of various plane coordinate systems included in the guide for defining and stating the position or location of points on the surface of the earth within the State.
"Illinois State Plane Coordinate System" means a collection of various plane coordinate systems that have been established by the United States Department of Commerce, National Oceanic and Atmospheric Administration, National Ocean Service, National Geodetic Survey, and predecessor agencies for defining and stating the position or location of points on the surface of the earth within the State.
"Metadata" means naming the used geodetic reference frame or datum; epoch or adjustment; unit of measurement; and projection.
765 ILCS 226/5