```
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``` ` ` `(765 ILCS 225/7)` `(from Ch. 133, par. 107)` ```
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``` ` ` `Sec. 7. ` ```
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For purposes of more precisely defining the Illinois Coordinate
System the following definitions by the United States
National Geodetic Survey are
adopted:
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``` ` ` ```
The Illinois Coordinate System, East Zone, is based on the transverse
Mercator
projection of the North American Datum of 1983 (NAD 83) or the Clarke
spheroid of 1866 (North American Datum of 1927) (NAD 27), having a central
meridian of
eighty-eight degrees and twenty minutes West (88µ =-20'W.) of Greenwich on
which meridian the scale is set at one part in 40,000 too small. The origin
of coordinates is at the intersection of the meridian eighty-eight degrees
and twenty minutes West (88µ =-20'W.) of Greenwich and thirty-six degrees
and forty minutes North (36µ =-40'N.) latitude. The origin is given the
coordinates
x = 300,000 meters (984,250.000 feet) and y = 0 meters for NAD 83 and x =
500,000 feet and y = 0 feet for the NAD 27.
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``` ` ` ```
The Illinois Coordinate System, West Zone, is based on the transverse
Mercator
projection of the North American Datum of 1983 (NAD 83) or the Clarke
spheroid of 1866 North American Datum of 1927 (NAD 27), having a central
meridian of
ninety degrees and ten minutes West (90µ =-10'W.) of Greenwich, on which
meridian
the scale is set at one part in 17,000 too small. The origin of coordinates
is at the intersection of the meridian ninety degrees and ten minutes West
(90µ =-10'W.) of Greenwich and thirty-six degrees and forty minutes North
(36µ =-40'N.) latitude. The origin is given the coordinates x = 700,000
meters (2,296,583.333 feet) and y = 0 meters for NAD 83 and x = 500,000 feet
and y = 0 feet for the NAD 27.
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``` ` ` ```
The position of the Illinois Coordinate System is as marked on the ground
by monumented survey stations established in
conformity with standards
adopted by the United States National Geodetic Survey for
second and higher order
work, whose geodetic positions have been rigidly adjusted on the North American
Datum (NAD 1927 or NAD 1983, or both), and whose coordinates have been computed
on the system herein defined. Any such stations may be used for establishing
a survey connection with the Illinois Coordinate System.
``` ```
``` `(Source: P.A. 92-311, eff. 8-9-01.)` ```
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