[unav_all] AGU Session G016: Modernizing Regional Reference Frames and Vertical Datums for North America

Craymer, Michael (NRCan/RNCan) michael.craymer at canada.ca
Mon Jul 30 13:07:02 MDT 2018

Dear Colleagues,

We encourage you to submit abstracts to AGU Fall Meeting session G016 titled "Modernizing Regional Reference Frames and Vertical Datums for North America ".  This session focuses on a broad range of issues surrounding all aspects of replacing NAD 83, NAVD 88 and IGLD 85.  A sample of topics relevant to this session include:

- Methods for processing GPS Networks, including linear versus non-linear velocities and detection of discontinuities
- Detection and correction of CORS whose coordinates drift from predicted velocities
- Methodologies for monitoring crustal motion in 3 dimensions
- Tracking changes to the geoid at both regional and continental scales
- Transitioning from epoch-fixed passive geodetic control to time-dependent active geodetic control

The deadline for abstract submissions is this Wednesday August 1st. Full session details and an abstract submission link are available at

Thank you, and we look forward to seeing you in Washington D.C.!

Dru Smith (US National Geodetic Survey)
Mike Craymer (Canadian Geodetic Survey)
Dan Roman (US National Geodetic Survey)
John Crowley (Canadian Geodetic Survey)

Session Description:
In 2022 the existing non-geocentric reference frames of North America will be succeeded by a set of modern ones using the latest realization of ITRF that is fixed separately to the North American, Caribbean, Marianas and Pacific tectonic plates. In addition, all leveling-based vertical datums will be replaced with a geoid-based datum incorporating continental airborne gravity and new global geopotential model.
Contributions are invited that address the development, implementation and maintenance of such regional reference frames, including: defining a geocentric reference system fixed to a moving and deforming continent, defining a geoid-based vertical datum, implementing time dependencies including geoid change, creating accurate transformations, defining the role of private Real-Time Networks, determining dynamic heights, building geospatial databases capable of handling historic static data along with modern time-dependent data, and collaborations with neighboring countries to ensure compatible and seamless reference systems across the continent.
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