How many control points were used to develop the NAD83 horizontal control datum?

The National Spatial Reference System (NSRS), which includes the North American Datum of 1983 (NAD83), was developed using a significant number of control points to ensure accuracy and reliability across North America. The correct answer indicates that approximately 266,000 control points were utilized in the development of the NAD83 horizontal control datum. This large number of points reflects the extensive surveying and geodetic work that was required to create a consistent reference system across diverse geographic areas.

Utilizing such a substantial dataset allows for improved accuracy in positioning and navigation, which is crucial in various applications, ranging from land surveying to mapping and Geographic Information System (GIS) activities. The use of 266,000 control points ensures that the datum is representative of the geographical and geological characteristics of different regions, thereby providing a reliable framework for modern surveying practices.