Tuesday, May 21, 2019


Dan Martin works for the National Geodetic Survey and is the Northeast Regional Geodetic Adviser.


In 2022, NGS will be replacing the US horizontal and vertical datums (NAD 83 and NAVD 88).  In this talk we will review the need and process for these changes.  We will begin with a brief discussion of the history of the North American Datum of 1983 and the North American Vertical Datum of 1988, and the reasons for their ongoing evolution.  We will then discuss what activities are being undertaken to ensure a smooth transition to include new State Plane Coordinates.