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The North American Datum of 1983 (NAD83), which is defined in metres, replaced The NAD27 in the 1980s. The State Plane Coordinate Systems were also updated, but the National Geodetic Survey left the individual states to decide which (if any) definition of the foot they would use. All State Plane Coordinate Systems are defined in meters, and 42 of the 50 states use the meter-based State Plane Coordinate Systems only.

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