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  • Oct 1, 2020 all day
  • Location: Columbia, MD
  • Categories: USA
  • Latest Activity: Aug 23, 2020

Presenter: David R. Doyle

Seminar Date: Thursday, October 1, 2020

Seminar Location: Columbia, MD

Sheraton Columbia Town Center Hotel
10207 Wincopin Circle
Columbia, MD 21044
Phone: 410-730-3900
This seminar was originally to take place on May 4 but has been rescheduled due to COVID-19 health and safety regulations.
Seminar location is subject to change.


Registration:                        8:00 - 8:30 am

Morning Session:                8:30 am - 12:30 pm

Lunch (On your own):         12:30 - 1:30 pm

Afternoon Session:             1:30 - 5:00 pm

Fundamentals of Geodetic Datums

   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

New Geodetic Datums for the United States 2022

   Rationale for replacing current geodetic datums
      • Problems with NAD 83 and NAVD 88
      • Introduction to international terrestrial reference frame (ITRF)
      • 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

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