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Webinar: Journey to the Moving Center of Earth - Evolution of the Nat'l Spatial Reference System
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Webinar: Journey to the Moving Center of Earth - Evolution of the Nat'l Spatial Reference System
Webinar: Journey to the Moving Center of Earth - Evolution of the Nat


When: November 28, 2017
1:00 - 2:00 PM CT
Where: Online
United States
Dan Martin, National Geodetic Survey, Northeast Regional Geodetic Advisor



Click Here to Play Recording

Supporting Items: None for this event


: In 2022, NGS will be replacing the US horizontal and vertical datums (NAD 83 and NAVD 88).  This workshop is designed to discuss the need and process for these changes, as well as how that affects surveyors and their access to these datums.  Our journey will begin with a discussion of the history of the North American Datum of 1983 and the North American Vertical Datum of 1988, their relationships to other reference frames, and the reasons for their ongoing evolution. We will also discuss the relationships of geoid models to various versions of NAD 83, and what can happen should these relationships be ignored.  Finally, we will discuss the need to replace NAD 83 and NAVD 88, and what activities are being undertaken to ensure a smooth transition.

Bio: Dan Martin works for the National Geodetic Survey and has been the Northeast Regional Geodetic Advisor since May of 2015.  As the Regional Advisor, he instructs local surveyors, state and municipal agencies, and the geospatial community at large, on how to use and preserve the National Spatial Reference System, and provides liaison between the National Geodetic Survey and the States of ME, NH, VT, MA, CT, RI, NY, and NJ, as well as other federal agencies.   He worked in the Route Survey and Geodetic Survey sections of the Vermont Agency of Transportation from 1988 through 2003, and held the position of Geodetic Program Supervisor for the Agency from 1999 through 2003.  In 2003 Dan began his career with the National Geodetic Survey as the Vermont State Geodetic Advisor.  Dan is a Past President and Fellow Member of the American Association for Geodetic Surveying (AAGS), he is also a member of the Vermont Society of Land Surveyors and the New Hampshire Land Surveyors Association.


Key Words: National Geodetic Survey, NGS, datum, 2022, geospatial, NAD 83, NAVD 88, geoid




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