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Progress towards a common North American Geoid in 2012. Daniel Roman , Yan Wang & Xiaopeng Li National Geodetic Survey Geosciences Research Division. Considerations for Unification. Datum surface (W 0 selection) GNSS Reference Frame EGM Reference Model Kernel Modification
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Progress towards a common North American Geoid in 2012 Daniel Roman, Yan Wang & Xiaopeng Li National Geodetic Survey Geosciences Research Division
Considerations for Unification • Datum surface (W0 selection) • GNSS Reference Frame • EGM Reference Model • Kernel Modification • USGG2012 – CGG2010 Comparisons • Gravity data sets • Techniques • GRAV-D
Agreement on W0 Value Regional and global geoid based vertical datumsII: Progress towards a common North American Geoid in 2012
Tide Gauge comparisons limited to where SST models exist 62,636,856.00 m2/s2 F.I.G. Working Week 2012 6-10 May 2012 Rome, Italy
Goemetric Reference Frame NAD83(CSRS) vs NAD83(2011) NAD83(CSRS) vs NAD 83(2022) U.S. may have to keep “NAD 83” name for legal reasons It will effectively be IGS2020 or ITRF2020 Likely fixed at a specific epoch (not dynamic) HTDP to transform Use these to access GNSS-derived orthometric heights • PERSOMM Rich Snay • Should agree • Differing SOP’s may cause inconsistencies in velocities and positional coordinates • Must also track ref. epoch • U.S. set epoch at 2010.0 • Canada also tracks GIA closely
GRAV-D Status Map Key Green: Available data and metadataBlue: Data being processed, metadata may be availableOrange: Data collection underwayWhite: Planned for data collection
Questions? Daniel R. Roman, Ph.D., GRAV-D P.I., Geoid Team Lead Geosciences Research Division, National Geodetic Survey, NOS, NOAA +1-301-713-3202 x161 dan.roman@noaa.gov