When converted from NAD27 to NAD83, horizontal shifts of point positions in the conterminous United States can be as much as 100 meters (328 ft).

Question

Quizplus · Accepted Answer

The North American Datum of 1983 (NAD83) was a recalibration of the North American Datum of 1927 (NAD27), using a different ellipsoid and more accurate positioning technology. This recalibration resulted in horizontal shifts of point positions by as much as 100 meters in some areas of the conterminous United States due to improvements in measurement accuracy and changes in the ellipsoid used for Earth's shape modeling.

When Converted from NAD27 to NAD83, Horizontal Shifts of Point