Oklahoma Code § 60-1001

Title 60. Property: Adoption and description of official system of
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coordinates.
A.  The systems of plane coordinates which have been established
by the National Oceanic and Atmospheric Administration/National
Geodetic Survey, formerly the National Ocean Service/National
Geodetic Survey, formerly the United States Coast and Geodetic
Survey, or its successors for defining and stating the geographic
positions or locations of points on the surface of the earth within
the State of Oklahoma are hereafter to be known and designated as
the Oklahoma Coordinate System of 1927, the Oklahoma Coordinate
System of 1983, and the Oklahoma Plane Coordinate System (OKPCS).
For the purpose of the use of the Oklahoma Coordinate System of
1927 and the Oklahoma Coordinate System of 1983, the state is
divided into a North Zone and a South Zone.
B.  1.  The area now included in the following counties shall
constitute the North Zone:  Adair, Alfalfa, Beaver, Blaine,
Canadian, Cherokee, Cimarron, Craig, Creek, Custer, Delaware, Dewey,
Ellis, Garfield, Grant, Harper, Kay, Kingfisher, Lincoln, Logan,
Major, Mayes, Muskogee, Noble, Nowata, Okfuskee, Oklahoma, Okmulgee,
Osage, Ottawa, Pawnee, Payne, Roger Mills, Rogers, Sequoyah, Texas,
Tulsa, Wagoner, Washington, Woods and Woodward.
2.  The area now included in the following counties shall
constitute the South Zone:  Atoka, Beckham, Bryan, Caddo, Carter,
Choctaw, Cleveland, Coal, Comanche, Cotton, Garvin, Grady, Greer,
Harmon, Haskell, Hughes, Jackson, Jefferson, Johnston, Kiowa,
Latimer, Leflore, Love, McClain, McCurtain, McIntosh, Marshall,
Murray, Pittsburg, Pontotoc, Pottawatomie, Pushmataha, Seminole,
Stephens, Tillman and Washita.
3.  For the purpose of the use of the Oklahoma Plane Coordinate
System (OKPCS), the most recent system of plane coordinate and zone
designation that has been established by the National Geodetic
Survey (NGS), or a successor, that is based on the North American
Terrestrial Reference Frame of 2022 (NATRF2022), or a successor, and
the National Spatial Reference System (NSRS), or a successor, and
known as the State Plane Coordinate System (SPCS), or a successor,
for defining and stating the geographic positions or location of
points within the state shall be known as the "Oklahoma Plane
Coordinate System" (OKPCS).

C.  1.  As established for use in the North Zone, the Oklahoma
Coordinate System of 1927 or the Oklahoma Coordinate System of 1983
shall be named; and in any land description in which it is used, it
shall be designated the "Oklahoma Coordinate System of 1927 North
Zone" or the "Oklahoma Coordinate System of 1983 North Zone".
2.  As established for use in the South Zone, the Oklahoma
Coordinate System of 1927 or the Oklahoma Coordinate System of 1983
shall be named; and in any land description in which it is used, it
shall be designated the "Oklahoma Coordinate System of 1927 South
Zone" or the "Oklahoma Coordinate System of 1983 South Zone".
3.  As established for use, the Oklahoma Plane Coordinate System
(OKPCS) shall be named, and in any land description in which it is
used, it shall be designated the "Oklahoma Plane Coordinate System"
(OKPCS).

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