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  • Arizona Coordinate System, 1983

    The following is taken from the Arizona Revised Statutes, Title 33, Chapter 1, Article 3 sections 33-121 and 33-122. Also see a map of state plane zones and codes.

    33-131 Arizona coordinate system, 1983; zones; composition

    1. The Arizona coordinate system, 1983, is the system of plane coordinates which has been established by the national geodetic survey for defining and stating the positions or locations of points on the surface of the earth in this state.
    2. The Arizona coordinate system, 1983, contains three zones as follows:
      1. The west zone, composed of La Paz, Mohave and Yuma counties.
      2. The central zone, composed of Coconino, Maricopa, Pima, Pinal, Santa Cruz and Yavapai counties.
      3. The east zone, composed of Apache, Cochise, Gila, Graham, Greenlee and Navajo counties.
    3. In any land description in which the Arizona coordinate system, 1983, is utilized the system shall be designated "Arizona coordinate system, 1983, __________ zone", with the name of the appropriate zone inserted.

    33-132. Coordinates of system; zone definitions

    1. The plane coordinates of a point on the earth's surface, to be used in the position or location of such point in the appropriate zone of the system, shall consist of two distances, expressed in feet and decimals of a foot (foot value 0.3048 meter exact). One of these distances, to be known as the "X-coordinate", shall give the position in an east-and-west direction, and the other, to be known as the "Y-coordinate", shall give the position in a north-and-south direction. These coordinates shall depend on and conform to the coordinates on the Arizona coordinate system, 1983, of the horizontal control stations of the national geodetic survey in this state, as these coordinates have been determined by the survey.
    2. For the purpose of more precisely defining the Arizona coordinate system, the following definitions of the national geodetic survey are adopted:
      1. The Arizona coordinate system, 1983, west zone, is a transverse mercator projection of the North American datum, 1983, having a central meridian 113 o 45' 00" west of Greenwich, on which meridian the scale is set one part in fifteen thousand too small. The origin of the coordinates is at the intersection of the meridian 113 o 45' 00" west of Greenwich and the parallel of 31 o 00' 00" north latitude. This origin is given the coordinates of "X" equals seven hundred thousand feet and "Y" equals zero feet.
      2. The Arizona coordinate system, 1983, central zone, is a transverse mercator projection of the North American datum, 1983, having a central meridian 111 o 55' 00" west of Greenwich, on which meridian the scale is set at one part in ten thousand too small. The origin of the coordinates is at the intersection of the meridian 111 o 55' 00" west of Greenwich and the parallel of 31 o 00' 00" north latitude. This origin is given the coordinates of "X" equals seven hundred thousand feet and "Y" equals zero feet.
      3. The Arizona coordinate system, 1983, east zone, is a transverse mercator projection of the North American datum, 1983, having a central meridian 110 o 10' 00" west of Greenwich, on which meridian the scale is set at one part in ten thousand too small. The origin of coordinates is at the intersection of the meridian 110 o 10' 00" west of Greenwich and the parallel of 31 o 00' 00" north latitude. The origin is given the coordinates of "X" equals seven hundred thousand feet and "Y" equals zero feet.
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