Geodetic Datums: Fundamentals and New Developments
Agenda
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
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Credits
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).
Speakers
David R. Doyle, PLS
Owner Base 9 Geodetic Consulting Services
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 he 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.