55-1705. ZONE DEFINITIONS. For the purpose of more precisely defining the Idaho coordinate system of 1983, the following definitions are adopted:

(1) The Idaho coordinate system of 1983, east zone, is a transverse mercator projection of the North American datum of 1983 based on the geodetic reference system of 1980 (GRS 80), having a central meridian 112°10′ west of Greenwich, which meridian has a reduced scale of one (1) part in nineteen thousand (19,000). The origin of coordinates is at the intersection of the meridian 112°10′ west of Greenwich and the parallel 41°40′ north latitude. This origin is given the coordinates: N=0 meters and E=200,000 meters.

(2) The Idaho coordinate system of 1983, central zone, is a transverse mercator projection of the North American datum of 1983 based on the geodetic reference system of 1980 (GRS 80), having a central meridian 114°00′ west of Greenwich, which meridian has a reduced scale of one (1) part in nineteen thousand (19,000). The origin of coordinates is at the intersection of the meridian 114°00′ west of Greenwich and the parallel 41°40′ north latitude. This origin is given the coordinates: N=0 meters and E=500,000 meters.

(3) The Idaho coordinate system of 1983, west zone, is a transverse mercator projection of the North American datum of 1983 based on the geodetic reference system of 1980 (GRS 80), having a central meridian 115°45′ west of Greenwich, which meridian has a reduced scale of one (1) part in fifteen thousand (15,000). The origin of coordinates is at the intersection of the meridian 115°45′ west of Greenwich and the parallel 41°40′ north latitude. This origin is given the coordinates: N=0 meters and E=800,000 meters.

(4) The Idaho coordinate system of 1983, single zone, is a transverse mercator projection of the North American datum of 1983 based on the geodetic reference system of 1980 (GRS 80), having a central meridian 114°00′ west of Greenwich, which meridian has a reduced scale of one (1) part in two thousand five hundred (2,500). The origin of coordinates is at the intersection of the meridian 114°00′ west of Greenwich and the parallel 42°00′ north latitude. This origin is given the coordinates: N=1,200,000 meters and E=2,500,000 meters.

History:

[55-1705, added 1967, ch. 275, sec. 5, p. 771; am. 1995, ch. 70, sec. 4, p. 180; am. 2010, ch. 256, sec. 7, p. 653.]