From dru.smith at noaa.gov Wed Jul 18 06:32:13 2018 From: dru.smith at noaa.gov (Dru Smith) Date: Wed, 18 Jul 2018 09:32:13 -0400 Subject: [IGSMAIL-7651] Modernized Reference Frames and Vertical Datums session at AGU Message-ID: Colleagues, We invite 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 Submit your abstracts here: https://agu.confex.com/agu/fm18/g/papers/index.cgi?sessionid=50738 Thank you, and we look forward to seeing you in Washington D.C.! Dru Smith, Mike Craymer, Dan Roman and John Crowley 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.