§ 50:7 — Superseded state coordinate systems; definitions retained

§7. Superseded state coordinate systems; definitions retained
A. The Louisiana Coordinate System of 1927 was deprecated beginning December
31, 1995, and the Louisiana Coordinate System of 1983 will be deprecated upon the National
Geodetic Survey's release of the National Spatial Reference System of 2022. The previously
adopted definitions for these deprecated systems are retained.
B. Zones. For these deprecated systems, the state was divided into a North Zone, a
South Zone, and an Offshore Zone as follows:
(1) The area now included in the following parishes shall constitute the North Zone:
Avoyelles, Bienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne, Concordia, DeSoto,
East Carroll, Franklin, Grant, Jackson, LaSalle, Lincoln, Madison, Morehouse, Natchitoches,
Ouachita, Rapides, Red River, Richland, Sabine, Tensas, Union, Vernon, Webster, West
Carroll, and Winn.
(2) The area now included in the following parishes shall constitute the South Zone:
Acadia, Allen, Ascension, Assumption, Beauregard, Calcasieu, Cameron, East Baton Rouge,
East Feliciana, Evangeline, Iberia, Iberville, Jefferson, Jefferson Davis, Lafayette, Lafourche,
Livingston, Orleans, Plaquemine, Pointe Coupee, St. Bernard, St. Charles, St. Helena, St.
James, St. John the Baptist, St. Landry, St. Martin, St. Mary, St. Tammany, Tangipahoa,
Terrebonne, Vermilion, Washington, West Baton Rouge, and West Feliciana.
(3) The area now included in that area of the Gulf of Mexico defined as being within
two hundred miles of the state of Louisiana shall constitute the Offshore Zone.
C. Definition of zones.
(1) For purposes of more precisely defining the Louisiana Coordinate System of
1927, the following definition by the United States Coast and Geodetic Survey, now National
Ocean Service/National Geodetic Service, was previously adopted:
(a) The "Louisiana Coordinate System of 1927 North Zone" is a Lambert conformal
conic projection of the Clarke spheroid of 1866, having standard parallels at north latitudes
31 degrees 10 minutes and 32 degrees 40 minutes, along which parallels the scale shall be
exact. The origin of coordinate is at the intersection of the meridian 92 degrees 30 minutes
west of Greenwich and the parallel 30 degrees 40 minutes north latitude. This origin is given
the coordinates: x = 2,000,000' and y = 0', as now defined.
(b) The "Louisiana Coordinate System of 1927 South Zone" is a Lambert conformal
conic projection of the Clarke spheroid of 1866, having standard parallels at north latitudes
29 degrees 18 minutes and 30 degrees 42 minutes, along which parallels the scale shall be
exact. The origin of coordinates is at the intersection of the meridian 91 degrees 20 minutes
west of Greenwich and the parallel 28 degrees 40 minutes north latitude. This origin is given
the coordinates: x = 2,000,000' and y= 0', as now defined.
(2) For purposes of more precisely defining the Louisiana Coordinate System of
1983, the following definition by the National Ocean Service/National Geodetic Service was
previously adopted:
(a) The "Louisiana Coordinate System of 1983 North Zone" is a Lambert conformal
conic projection of the North American Datum of 1983, having standard parallels at north
latitudes 31 degrees 10 minutes and 32 degrees 40 minutes, along which parallels the scale
shall be exact. The origin of coordinates is at the intersection of the meridian 92 degrees 30
minutes west of Greenwich and the parallel 30 degrees 30 minutes north latitude. This origin
is given the coordinates: x = 1,000,000 meters and y = 0 meters.
(b) The "Louisiana Coordinate System of 1983 South Zone" is a Lambert conformal
conic projection of the North American Datum of 1983, having standard parallels at north
latitudes 29 degrees 18 minutes and 30 degrees 42 minutes along which parallels the scale
shall be exact. The origin of coordinates is at the intersection of the meridian 91 degrees 20
minutes west of Greenwich and the parallel 28 degrees 30 minutes north latitude. This origin
is given the coordinates: x = 1,000,000 meters and y = 0 meters.
(c) The "Louisiana Coordinate System of 1983 Offshore Zone" is a Lambert
conformal conic projection of the North American Datum 1983, having standard parallels
at north latitudes 26 degrees 10 minutes and 27 degrees 50 minutes, along which parallels
the scale shall be exact. The origin of coordinates is at the intersection of the meridian 91
degrees 20 minutes west of Greenwich and the parallel 25 degrees 30 minutes north latitude.
This origin is given the coordinates: x = 1,000,000 meters and y = 0 meters.

Legislative History

Acts 1985, No. 913, §1; Acts 2024, No. 626, §2.