20 FEB 2009 Salt Lake City, UTACSM-MARLS-UCLS-WFPS Conference 2009 Geoid Modeling, GRAV-D and Height Mod.

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Presentation transcript:

20 FEB 2009 Salt Lake City, UTACSM-MARLS-UCLS-WFPS Conference 2009 Geoid Modeling, GRAV-D and Height Mod

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

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

20 FEB 2009 Salt Lake City, UTACSM-MARLS-UCLS-WFPS Conference 2009 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 Earth’s Surface h h h h h H H H H H N N N N N Ellipsoid Hybrid Geoid Geoid Gravimetric Geoid

20 FEB 2009 Salt Lake City, UTACSM-MARLS-UCLS-WFPS Conference FEB 2009 Salt Lake City, UTACSM-MARLS-UCLS-WFPS Conference (Beta) GPSBM 2009 for CONUS

20 FEB 2009 Salt Lake City, UTACSM-MARLS-UCLS-WFPS Conference 2009 USGG2009 (Beta) 20 FEB 2009 Salt Lake City, UTACSM-MARLS-UCLS-WFPS Conference GEOID09 (Beta)

20 FEB 2009 Salt Lake City, UTACSM-MARLS-UCLS-WFPS Conference 2009 Extent of Gravity Coverage Shown are the differences between NGSIDB value and EGM08 model 20 FEB 2009 Salt Lake City, UTACSM-MARLS-UCLS-WFPS Conference 20097

20 FEB 2009 Salt Lake City, UTACSM-MARLS-UCLS-WFPS Conference 2009 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 GRAV-D: Gravity for the Redefinition of the American Vertical Datum

20 FEB 2009 Salt Lake City, UTACSM-MARLS-UCLS-WFPS Conference 2009 A North American Geoid 20 FEB 2009 Salt Lake City, UTACSM-MARLS-UCLS-WFPS Conference 20099

20 FEB 2009 Salt Lake City, UTACSM-MARLS-UCLS-WFPS Conference 2009 For a more thorough discussion, see the USGG2009/GEOID09 session later today