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| Central Oregon Coordinate System |
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| The Central Oregon Coordinate System is a mapping projection that covers the counties of Crook, |
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| Deschutes and Jefferson in the central part of Oregon. |
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| A system that has a ground to grid difference of no more than 0.05 feet in 1000 feet in the least |
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| populated areas and 0.00 to 0.02 feet in 1000 feet in the major population area. |
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| To help the local surveyor to perform precise survey work. |
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| A continuous coordinate system for all surveys and maps. |
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| In many cases no need to use a ground to grid factor. |
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| The Central Oregon Coordinate System is based on the following data: |
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| Datum: NAD 83 (adjustment 1991) |
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| Projection: Transverse Mercator |
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| Zone: Central Oregon LCS |
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| Central Meridian: W 121° 17' 00.00" |
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| Latitude of Origin: N 43° 00' 00.00" |
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| Origin Northing: 0.00 feet |
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| Origin Easting: 3,300,000.00 feet |
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| Scale Along Meridian: 1.0001600 |
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| Linear Units: International Foot |
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| Mark Naming Conventions: |
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| For Section & Quarter Corner |
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| MARK NAME: 17 12 23 4 0 A |
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| 17 Township 17 South of the Willamette Base Line |
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| 12 Range 12 East of the Willamette Principal Meridian |
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| 4 4 X 10 chains North from SW. Cor. of Section 23. |
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| 0 0 X 10 chains East from SW. Cor. of Section 23. |
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| A More than one important corner in proximity. |
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| Note: The 10 chains is more a fractional part than a distance. |
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| All others are the name stamped on the monument or unique to that monument |
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