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Presenter: David R. Doyle

Seminar Date:

Seminar Location: Online

Register Now * Coordinator Registration Not Available.


Day One: Thursday, October 1, 2020
10:30 am - 3:15 pm CDT (including a 60-min. break)

Horizontal Datums

   Geodetic surfaces – ellipsoid and geoid
   Positioning elements of the National Spatial Reference System (NSRS)
   Classical horizontal positioning – triangulation and traverse
   U.S. national horizontal datums – NAD 27 and NAD 83

Development of Satellite Positioning Systems

   Foundation of space-based positioning up to GPS/GNSS
   GPS impact on integrity of NAD 83
   Relationship of NAD 83 and WGS 84
   Horizontal datum transformations – NADCON, Molodensky

Vertical Datums

   Vertical datums definitions – geodetic and tidal
   U.S. national vertical datums – NGVD 29 and NAVD 88
   Issues with GPS/GNSS-derived heights
   Vertical datum transformations - VERTCON

Day Two: Friday, October 2, 2020
10:30 am - 2:45 pm CDT (including a 60-min. break)

Rationale for Replacing Current Geodetic Datums

   Problems with NAD 83 and NAVD 88
   Introduction to International Terrestrial Reference Frame
   Adoption of ITRF14 into NSRS

National Geodetic Survey Plans for New National Datums

   New geometric/geopotential datum definitions
   Gravity for the Redefinition of the American Vertical Datum (GRAV-D)
   Computing approximate horizontal and vertical positional differences
   Importance of positional metadata

Webinar Instructions

Each webinar session earns continuing education credit and can be registered for individually. All attendees must log-on through their own email – attendees may not watch together if they wish to earn continuing education credit. HalfMoon Education Inc. must be able to prove attendance if either the attendee or HalfMoon Education Inc. is audited.

Certificates of completion will be provided for each webinar attended and will be sent via email in PDF form about five business days after the conclusion of the series.

Webinars are presented via GoToWebinar, an easy-to-use application that can be run on most systems and tablets. Instructions and login information will be provided in an email sent close to the date of the webinar. It is highly recommended that you download, install and test the application before the webinar begins by clicking on the link in the email.

GoToWebinar App requirements: 
Windows 7 - 10 or Mac OSX Mavericks (10.9) - macOS Catalina (10.15)

Web Browser:
The two most recent version of the following browsers:
Google Chrome, Mozilla Firefox, Apple Safari, Microsoft Edge
Internet Explorer v11 (or later) with Flash enabled

Internet connection:
 Minimum of 1Mbps       Hardware: 2GB RAM or more

For more information, visit the Support section at www.gotowebinar.com

Credit Information:

Who Should Attend

  • Engineers
  • Land Surveyors
  • Floodplain Managers

Professional Engineers
     7.0 PDHs in all states

Land Surveyors
     7.0 PDHs, (excluding Florida, Kansas,
           New Jersey, Tennessee, Texas)

Floodplain Managers
     7.0 ASFPM CECs

Continuing Education Credit Information

This interactive webinar offers 7.0 PDHs/continuing education hours professional engineers licensed in all states and 7.0 PDHs to land surveyors in all states, except those in Florida, Kansas, New Jersey, Tennessee, and Texas.

HalfMoon Education is an approved continuing education sponsor for engineers in Florida (Provider No. 0004647), Indiana (License No. CE21700059), Maryland, New Jersey (Approval No. 24GP00000700), North Carolina (S-0130), and North Dakota.

HalfMoon Education is deemed an approved continuing education provider for engineers and land surveyors licensed in New York via its registration with the American Institute of Architects Continuing Education System (Regulations of the Commissioner §68.14(i)(2) and §69-1.5(i)(2)).

HalfMoon Education is an approved continuing education sponsor for land surveyors licensed in Indiana (License No. CE21700059), Maryland, North Carolina (S-0130), and North Dakota.

The Association of State Floodplain Managers has approved this course for 7.0 CECs for certified floodplain managers.

Course completion certificates will be awarded to participants who complete the webinar in its entirety, respond to all the verification prompts during the instruction, and earn a score of 80% on the quiz that follows the instruction (multiple attempts allowed).


David R. Doyle

Base 9 Geodetic Consulting Services, in Silver Spring, MD

Mr. Doyle has been involved in geodetic surveying since 1967. He joined the National Geodetic Survey in 1972 and functioned in numerous positions dealing with national adjustments, datum transformation and outreach to the surveying and geospatial community. Mr. Doyle held the position of Chief Geodetic Surveyor for 12 years prior to his retirement in 2013. He now owns Base 9 Geodetic Services which provides consultation to public and private agencies and companies as well as teaching seminars on the fundamentals of geodesy and the National Spatial Reference System. Mr. Doyle is a past president of the American Association for Geodetic Surveying, and is an active member of the DC, Maryland and Virginia professional surveyors’ associations. He has published more than 30 technical articles on geodesy and was honored as the recipient of the AAGS 2018 Joseph Dracup Lifetime Achievement award in addition to numerous other service awards from state and national surveying associations.

Tuition Costs:

Standard Tuition: $299.00
Online Tuition (pre-registration): $299.00
Group Prices
3 or more people each: $199.00

Each registration includes one copy of a manual prepared by the seminar speakers.