Code of Alabama
Article 1 - Alabama Coordinate System.
Section 35-2-5 - Definition of System by United States Coast and Geodetic Survey Adopted.

(a) For purposes of more precisely defining the Alabama coordinate system, the following definition by the United States coast and geodetic survey is adopted: The Alabama coordinate system, east zone, is a transverse Mercator projection of the Clarke spheroid of 1866, having a central meridian 85 degrees 50' west from Greenwich, on which meridian the scale is set one part in 25,000 too small. The origin of coordinates is at the intersection of the meridian 85 degrees 50' west longitude and the parallel 30 degrees 30' north latitude. This origin is given the coordinates: x = 500,000 feet and y = 0 feet. The Alabama coordinate system, west zone, is a transverse Mercator projection of the Clarke spheroid of 1866, having a central meridian 87 degrees 30' west from Greenwich, on which meridian the scale is set one part in 15,000 too small. The origin of coordinates is at the intersection of the meridian 87 degrees 30' west longitude and the parallel 30 degrees 00' north latitude. This origin is given the coordinates: x = 500,000 feet and y = 0 feet.
(b) The position of the Alabama coordinate system shall be as marked on the ground by triangulation or traverse stations established in conformity with standards adopted by the United States coast and geodetic survey for first-order and second-order work, whose geodetic positions have been rigidly adjusted on the North American Datum of 1927, and whose coordinates have been computed on the system herein defined. Any such station may be used for establishing a survey connection with the Alabama coordinate system.

Structure Code of Alabama