Sec. 21.076. DEFINITIONS. (a) For the purpose of precisely defining the Texas Coordinate System of 1927 and the Texas Coordinate System of 1983, the following definitions are adopted:

(1) The Texas Coordinate System of 1927, North Zone, and the Texas Coordinate System of 1983, North Zone, is a Lambert conformal projection, having standard parallels at north latitudes 34° 39' and 36° 11', along which parallels the scale shall be exact. The origin of coordinates is at the intersection of the meridian 101° 30' west longitude and the parallel 34° 00' north latitude. The origin of the 1927 coordinate system is given the coordinates: x = 2,000,000 feet (720,000 varas) and y = 0 feet (0 varas). The origin of the 1983 coordinate system is given the coordinates: x = 200,000 meters (236,220 varas) and y = 1,000,000 meters (1,181,100 varas).

(2) The Texas Coordinate System of 1927, North Central Zone, and the Texas Coordinate System of 1983, North Central Zone, is a Lambert conformal projection, having standard parallels at north latitudes 32° 08' and 33° 58', along which parallels the scale shall be exact. The origin of coordinates for the 1927 coordinate system is at the intersection of the meridian 97° 30' west longitude and the parallel 31° 40' north latitude. This origin is given the coordinates: x = 2,000,000 feet (720,000 varas) and y = 0 feet (0 varas). The origin of coordinates for the 1983 coordinate system is at the intersection of the meridian 98° 30' west longitude and the parallel 31° 40' north latitude. This origin is given the coordinates: x = 600,000 meters (708,660 varas) and y = 2,000,000 meters (2,362,200 varas).

(3) The Texas Coordinate System of 1927, Central Zone, and the Texas Coordinate System of 1983, Central Zone, is a Lambert conformal projection, having standard parallels at north latitudes 30° 07' and 31° 53', along which parallels the scale shall be exact. The origin of coordinates is at the intersection of the meridian 100° 20' west longitude and the parallel 29° 40' north latitude. The origin of the 1927 coordinate system is given the coordinates: x = 2,000,000 feet (720,000 varas) and y = 0 feet (0 varas). The origin of the 1983 coordinate system is given the coordinates: x = 700,000 meters (826,770 varas) and y = 3,000,000 meters (3,543,300 varas).

(4) The Texas Coordinate System of 1927, South Central Zone, and the Texas Coordinate System of 1983, South Central Zone, is a Lambert conformal projection, having standard parallels at north latitudes 28° 23' and 30° 17', along which parallels the scale shall be exact. The origin of coordinates is at the intersection of the meridian of 99° 00' west longitude and the parallel 27° 50' north latitude. The origin of the 1927 coordinate system is given the coordinates: x = 2,000,000 feet (720,000 varas) and y = 0 feet (0 varas). The origin of the 1983 coordinate system is given the coordinates: x = 600,000 meters (708,660 varas) and y = 4,000,000 meters (4,724,400 varas).

(5) The Texas Coordinate System of 1927, South Zone, and the Texas Coordinate System of 1983, South Zone, is a Lambert conformal projection, having standard parallels at north latitudes 26° 10' and 27° 50', along which parallels the scale shall be exact. The origin of coordinates is at the intersection of the meridian 98° 30' west longitude and the parallel 25° 40' north latitude. The origin of the 1927 coordinate system is given the coordinates: x = 2,000,000 feet (720,000 varas) and y = 0 feet (0 varas). The origin of the 1983 coordinate system is given the coordinates: x = 300,000 meters (354,330 varas) and y = 5,000,000 meters (5,905,500 varas).

(b) The position of the Texas Coordinate System of 1927 and the Texas Coordinate System of 1983 shall be as marked on the ground by triangulation or traverse stations established in conformity with the standards adopted by the National Oceanic and Atmospheric Administration for first-order and second-order work, whose geodetic positions have been rigidly adjusted on the North American datum of 1927 or 1983, and whose coordinates have been computed on the system defined in this subchapter. Any of these stations may be used for establishing a survey connection with the Texas Coordinate System of 1927 or the Texas Coordinate System of 1983.

Acts 1977, 65th Leg., p. 2358, ch. 871, art. I, Sec. 1, eff. Sept. 1, 1977. Amended by Acts 1987, 70th Leg., ch. 616, Sec. 7, eff. Sept. 1, 1987.