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Fundamentals of Geodesy Part VIII - Future Datums for the U.S

Fundamentals of Geodesy Part VIII - Future Datums for the U.S

Fundamentals of Geodesy Part VIII - Future Datums for the U.S

David Doyle
David Doyle
on behalf of GeoLearn LLC

$49.00 $ 49.00 $ 49.00

$ 49.00 49.00 49.00
49.00 $ 49.00 49.00 49.00
Normal Price: $49.00 $49.00


Launch date: 25 Nov 2014
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Last updated: 02 Feb 2021

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During 2008, the National Geodetic Survey conducted an in-house study of the ability of the National Spatial Reference System to support the increasing demands for high accuracy positioning services and capabilities. One of the significant conclusions of that effort was that NAD 83 and NAVD 88 (and other island vertical datums) have sufficient deficiencies that will likely make them unable to support the potential for improved positioning technologies in the near future. To meet these challenges NGS has embarked on an effort to replace these datums with a more contemporary reference frame that will bring the United States geometric datum into closer alignment with the International Terrestrial Reference Frame and provide for a vertical datum based on gravity observations instead of geodetic leveling and the reliance on passive geodetic marks (i.e. bench marks). This class will discuss the rational for these changes, the on-going program of Gravity for the Redefinition of the American Vertical Datum (GRAV-D) and the changes in position and heights that will result from these new datums.


1. Elements of the NGS 10 Year Plan
2. Rationale for updating the United States national datums
3. Relationship between NAD 83 and ITRF
4. Components of the GRAV-D program
5. Potential changes in horizontal positions and heights
David Doyle

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David Doyle
on behalf of GeoLearn LLC

Dave Doyle joined the National Geodetic Survey in 1972, and held the position of chief geodetic surveyor at his retirement in January, 2013. He was responsible for the development, technical design and management of plans and programs that enhance the United States National Spatial Reference System. Mr. Doyle began his career as a geodetic surveyor in the U.S. Army in 1967. From 1970 to 1972 he worked for a private surveying company near Washington D.C. where he was responsible for completing boundary, topographic and engineering surveys while he pursued undergraduate studies in geodesy and mathematics at the George Washington University. During his time at NGS his experiences included all phases of geodetic triangulation, astronomic positioning, leveling, GPS data collection, data analysis, datum transformations, network adjustments, and data publication. He has also provided technical support to various countries for the modernization of national and regional geodetic reference systems in Caribbean and Central America, Africa, and the Pacific. Mr. Doyle’s activities also include 33 articles in national and local surveying publications and he has conducted more than 380 workshops and seminars detailing the numerous aspects of geodesy and the National Spatial Reference System.

Mr. Doyle is a past president of the American Association for Geodetic Surveying, a Fellow member of the American Congress on Surveying and Mapping, a charter member of the Geographic and Land Information Society, and he has served on the U.S. delegation to the International Federation of Surveyors. Mr. Doyle is also an active member of the District of Columbia, Maryland and Virginia surveyors’ professional associations and was awarded the 2008 Surveyor of the Year by the Maryland Society of Surveyors.

Current Accreditations

This course has been certified by or provided by the following Certified Organization/s:

  • Texas A&M University Corpus Christi
  • 1.00 Hours

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