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Geoid Modeling, GRAV-D and Height Mod

Geoid Modeling, GRAV-D and Height Mod. Why make a new vertical datum?. Courtesy of Dr. Dennis Milbert. 20 FEB 2009 Salt Lake City, UT. ACSM-MARLS-UCLS-WFPS Conference 2009. 2. Vertical Shift due the National Readjustment of 2007. 20 FEB 2009 Salt Lake City, UT.

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Geoid Modeling, GRAV-D and Height Mod

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  1. Geoid Modeling, GRAV-D and Height Mod ACSM-MARLS-UCLS-WFPS Conference 2009

  2. Why make a new vertical datum? Courtesy of Dr. Dennis Milbert 20 FEB 2009 Salt Lake City, UT ACSM-MARLS-UCLS-WFPS Conference 2009 ACSM-MARLS-UCLS-WFPS Conference 2009 2

  3. Vertical Shift due the National Readjustment of 2007 20 FEB 2009 Salt Lake City, UT ACSM-MARLS-UCLS-WFPS Conference 2009 ACSM-MARLS-UCLS-WFPS Conference 2009 3

  4. Hybrid Geoid Height Models (e.g., GEOID09), Gravimetric Geoid Height Models (e.g., USGG2009) and Conversion Surfaces using GPS on BM data Gravimetric Geoid systematic misfit to BM’s but best fits “true” heights Hybrid Geoid“converted” to fit local BM’s, so best fits NAVD 88 heights Conversion Surface model of systematic misfit derived from BM’s in IDB h h h h H h H H H N N N H N N Earth’s Surface Ellipsoid Hybrid Geoid Gravimetric Geoid ACSM-MARLS-UCLS-WFPS Conference 2009

  5. (Beta) GPSBM 2009 for CONUS 20 FEB 2009 Salt Lake City, UT ACSM-MARLS-UCLS-WFPS Conference 2009 ACSM-MARLS-UCLS-WFPS Conference 2009 5

  6. USGG2009 (Beta) GEOID09 (Beta) 20 FEB 2009 Salt Lake City, UT ACSM-MARLS-UCLS-WFPS Conference 2009 ACSM-MARLS-UCLS-WFPS Conference 2009 6

  7. Extent of Gravity Coverage Shown are the differences between NGSIDB value and EGM08 model 20 FEB 2009 Salt Lake City, UT ACSM-MARLS-UCLS-WFPS Conference 2009 ACSM-MARLS-UCLS-WFPS Conference 2009 7

  8. GRAV-D: Gravity for the Redefinition of the American Vertical Datum • Official NGS policy as of Nov 14, 2007 • $38.5M over 10 years • Airborne Gravity Snapshot • “Static Geoid” • Absolute/Satellite Gravity Tracking • “Time Dependent Geoid” • Re-define the Vertical Datum (using gravimetric geoid as reference surface) of the USA by 2017 http://www.ngs.noaa.gov/GRAV-D/ ACSM-MARLS-UCLS-WFPS Conference 2009

  9. A North American Geoid 20 FEB 2009 Salt Lake City, UT ACSM-MARLS-UCLS-WFPS Conference 2009 ACSM-MARLS-UCLS-WFPS Conference 2009 9

  10. For a more thorough discussion,see the USGG2009/GEOID09 session later today ACSM-MARLS-UCLS-WFPS Conference 2009

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