City of West Chicago, Illinois

Where History and Progress Meet

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Horizontal Coordinates Based On NAD83 (1997)

The horizontal positions of all West Chicago points have been readjusted relative to nearby High Accuracy Reference Network (HARN) stations provided by NGS. The HARN stations have published positions which represent a new datum called NAD83(1997). Previous data from NGS were on a datum called NAD83(1986). Although the origin of NAD83 State Plane Coordinates has not been changed, the coordinates of NAD83(1986) points will differ from NAD83(1997) points.

It was found that the West Chicago points’ State Plane Coordinates were shifted by 0.02 feet South and 1.09 feet East. This shift is the difference in the calculated NAD83(1997) and published NAD83(1986) coordinate for the First Order point SE 7-39-9.

The HARN stations that were used were the Order A point ZAU B, and the Order B points Salt 2 and EWT IL83 A. The published horizontal positions of these points were held fixed in the adjustment.

A minimally constrained horizontal adjustment constraining ZAU B was performed to check the new published HARN coordinates versus our GPS network. The difference between the published and observed coordinates were calculated and the results are summarized below.

Changes in position from NGS values
By holding ZAU B fixed
Change = Calculated – Published

Point Name
(Order of Accuracy)
Change in Northing
(Feet)
Change in Easting
(Feet)
Salt 2
B Order horizontal
0.24
0.04
EWT IL83 A
B Order horizontal
0.10
0.03

Upon inspection, it can be seen that the differences are very small. Compared to the long distances between the three HARN points, these differences correspond to distance a precision of 1 in 500,000 or better, which exceeds First Order accuracy (1 in 100,000).

As a result, the coordinates of all three HARN points were held fixed in the final adjustment. The residuals in the GPS observations that were caused by the mismatch of coordinates shown by the above table would be placed mostly in the long vectors extending from The City to the HARN points. The short vectors that were observed in The City would essentially be unaffected and the relative geometry of the GPS network within The City would remain the same.

NAD 83(1997) Horizontal Control

NAD 83(1997) Illinois East Zone (1201)
State Plane Coordinates

West Chicago
Point
NORTHING
(US) Survey Feet
EASTING
(US) Survey Feet
COMBINED SCALE FACTOR
Grid Factor x Elevation Factor
Monument Status as of July 2001
WC5
1919088.12
1003472.61
0.999943
Good
WC5-A
–
–
0.999943
Destroyed
WC5-B
–
–
0.999943
Destroyed
WC10
1919281.64
1008923.19
0.999945
Destroyed
WC11
1917878.15
1006746.10
0.999945
Good
WC11-A
–
–
0.999945
Destroyed
WC15
1916508.99
1003504.55
0.999944
Good
WC20
1916568.27
1006230.01
0.999945
Good
WC21
1917107.78
1007131.26
0.999945
Good
WC21-A
–
–
0.999945
Destroyed
WC25
1916612.09
1008892.84
0.999945
Good
WC30
191661.68
1011546.67
0.999945
Good
WC30-A
–
–
0.999945
Destroyed
WC30-B
1916957.05
1010270.17
0.999944
Good
WC35
1916713.62
1014224.73
0.999945
Good
WC35-A
–
–
0.999944
Destroyed
WC35-B
1917971.54
1014173.34
0.999944
Good
WC40
1916786.40
1016866.82
0.999944
Good
WC45
1916858.41
1019498.35
0.999943
Good
WC45-A
1917404.68
1019678.46
0.999943
Good
WC45-B
1917017.42
1020473.27
0.999944
Good
WC50
1916890.31
1022152.33
0.999943
Good
WC50-A
1916706.68
1022138.44
0.999944
Good
WC50-B
1916713.11
1023755.17
0.999945
Good
WC55
1916896.22
1024771.46
0.999947
Good
WC55-A
1916529.48
1024515.63
0.999946
Good
WC60
1915785.55
1023599.29
0.999945
Good
WC61
1914170.16
1019481.00
0.999944
Good
WC65
1913831.94
1018200.96
0.999943
Good
WC65-A
–
–
0.999944
Destroyed
WC70
1913951.30
1016855.78
0.999944
Good
WC75
1912811.42
1012910.25
0.999945
Good
WC80
1913229.11
1011025.05
0.999943
Good
WC85
1913357.86
1010142.67
0.999945
Good
WC86
1913928.96
1009019.71
0.999945
Good
WC86-A
1913564.35
1009380.16
0.999945
Good
WC90
1913884.59
1007545.63
0.999944
Good
WC95
1913889.05
1003712.56
0.999944
Good
WC100
1911200.43
1003525.37
0.999945
Good
WC101

1913163.68

1008530.51
0.999945
Good
WC105
1911531.45
1010232.24
0.999945
Good
WC110-A
1911408.91
1013941.50
0.999945
Good
WC110-B
1912631.77
1013877.18
0.999945
Good
WC111
1912257.28
1015599.79
0.999944
Good
WC115
1911920.19
1018007.82
0.999943
Good
WC120
–
–
0.999944
Destroyed
WC120-A
–
–
0.999944
Destroyed
WC120-B
–
–
0.999946
Destroyed
WC125
1911533.39
1022100.65
0.999945
Good
WC130
1911582.87
1024730.71
0.999945
Good
WC130-A
1911012.62
1025020.26
0.999947
Good
WC130-B
–
–
0.99947
Destroyed
WC135
1908931.22
1024682.11
0.999947
Disturbed
WC140
1909983.32
1021663.02
0.999946
Good
WC145
1908724.81
1019385.32
0.999943
Good
WC146
1908616.09
1019328.44
0.999943
Good
WC150
1908717.62
1014142.46
0.999945
Good
WC155
1908725.76
1011633.93
0.999945
Good
WC160
1908694.26
1009116.76
0.999945
Good
WC165
1908615.84
1003517.78
0.999944
Disturbed
WC166
–
–
0.999944
Destroyed
WC167
–
–
0.999944
Destroyed
WC170
1905858.34
1003555.36
0.999944
Good
WC175
1905952.25
1008806.28
0.999945
Good
WC180
1906003.51
1011463.94
0.999945
Disturbed
WC185
1906054.64
1014104.19
0.999945
Good
WC185-A
1906070.39
1013450.51
0.999945
Good
WC185-B
1906043.62
1012395.48
0.999945
Good
WC190
1906054.80
1014112.78
0.999945
Good
WC195
1906073.30
1016823.79
0.999945
Good
WC200
1906165.31
1019400.18
0.999945
Good
WC205
1906165.44
1019406.82
0.999945
Good
WC210
1906209.45
1022049.98
0.999944
Good
WC210-A
1906204.17
1020623.57
0.999945
Good
WC215
1906210.17
1022091.45
0.999944
Good
WC220
1906251.13
1024699.19
0.999945
Disturbed
WC225
1906252.27
1024740.11
0.999945
Disturbed
WC230
1903683.57
1024725.35
0.999945
Disturbed
WC231
1903625.79
1022073.05
0.999944
Good
WC235
–
–
0.999945
Destroyed
WC236
1903917.86
1017742.25
0.999945
Good
WC240
1903520.92
1017777.93
0.999945
Good
WC245
1903309.56
1011392.18
0.999945
Good
WC250
1903358.15
1008790.25
0.999945
Good
WC255
1903217.53
1003550.73
0.999944
Disturbed
WC256
1903250.50
1003550.79
0.999944
Disturbed
WC260
1900604.02
1003546.16
0.999944
Disturbed
WC265
1900571.03
1003546.08
0.999944
Disturbed
WC270
1899387.06
1005960.75
0.999945
Good
WC271
1900055.16
1008481.16
0.999943
Good
WC275
1900695.68
1008773.18
0.999945
Good
WC280
1901152.50
1011271.03
0.999945
Good
WC285
1900821.73
1014066.82
0.999945
Good
WC290
1899642.87
1016587.66
0.999945
Good
WC291
1900447.37
1018875.85
0.999945
Good
WC295
1900903.57
1019375.44
0.999944
Disturbed
WC300
1900698.35
1021840.02
0.999943
Good
WC305
1901028.37
1024709.95
0.999946
Disturbed
WC310
–
–
0.999946
Destroyed

 

West Chicago
Point
NORTHING
(US) Survey Feet
EASTING
(US) Survey Feet
COMBINED SCALE FACTOR
Grid Factor x Elevation Factor
Monument Status
as of July 2001
WC312
1899165.53
1020343.11
0.999944
Good
WC315
1898271.50
1019332.39
0.999945
Good
WC320
1898175.89
1016658.13
0.999945
Good
WC325
1898160.16
1013681.17
0.999945
Good
WC330
1898666.73
1012944.49
0.999945
Good
WC335
1897779.00
1011060.20
0.999945
Good
WC335-A
–
–
0.999945
Destroyed
WC340
1898579.81
1008118.61
0.999945
Good
WC345
1895295.51
1003528.85
0.999944
Good
WC350
1895282.35
1003528.75
0.999944
Good
WC350-A
1895555.80
1003572.95
0.999944
Good
WC350-B
1895661.89
1004460.99
0.999944
Good
WC355
1895590.00
1005915.28
0.999945
Good
WC360
1895392.10
1008748.79
0.999946
Good
WC365
1895817.27
1012515.16
0.999945
Good
WC370
1895481.20
1014051.49
0.999946
Good
WC375
1895415.48
1015386.52
0.999945
Good
WC380
1895577.36
1016704.78
0.999945
Good
WC385
1896562.36
1018753025
0.999946
Good
WC390
1895615.95
1019316.26
0.999946
Good
WC390-A
1895610.35
1020173.50
0.999946
Good
WC395
1895686.11
1021825.46
0.999946
Good
WC400
1895709.81
1024672.22
0.999947
Good
WC405
1893496.45
1019343.65
0.999946
Disturbed
WC410
1893119.34
1022318.88
0.999947
Good
WC415
–
–
0.999947
Destroyed
WC420
1892451.04
1021551.44
0.999947
Good
WC425
1892452.85
1021953.34
0.999947
Good
WC425RSCT
–
–
0.999947
Destroyed
WC340
1890293.80
1019300.07
0.999947
Good

WC435

1890421.74
1020369.00
0.999947
Good
WC440
1891107.84
1022046.10
0.999948
Good
WC445
1890420.85
1024552.82
0.999947
Good
WC445-A
1890248.81
1024326.54
0.999947
Good
WC445-B
1890755.71
1023607.39
0.999947
Good
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