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Determining ġ and N and the Impact on the New Vertical Datum for North America

Determining ġ and N and the Impact on the New Vertical Datum for North America. Daniel R. Roman, Ph.D. 2009 Workshop on Monitoring North American Geoid Change 21-23 OCT 2009 Boulder, CO. NGS’ Plan: GRAV-D. Official NGS policy:

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Determining ġ and N and the Impact on the New Vertical Datum for North America

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  1. Determining ġ and N and the Impact on the New Vertical Datum for North America . Daniel R. Roman, Ph.D. 2009 Workshop on Monitoring North American Geoid Change 21-23 OCT 2009 Boulder, CO

  2. NGS’ Plan: GRAV-D Official NGS policy: Re-define the US Vertical Datum by creating a new gravimetric geoid 10 year program Two Major Program Elements Airborne Gravity “Snapshot” for Baseline Long Term Monitoring of Temporal Changes Projected program cost: $38.5M over 10 years • Official NGS policy: • Re-define the US Vertical Datum by creating a new gravimetric geoid • 10 year program • Two Major Program Elements • Airborne Gravity “Snapshot” for Baseline • Long Term Monitoring of Temporal Changes • Projected program cost: $38.5M over 10 years • Official NGS policy: • Re-define the US Vertical Datum by creating a new gravimetric geoid • 10 year program • Two Major Program Elements • Airborne Gravity “Snapshot” for Baseline • Long Term Monitoring of Temporal Changes • Projected program cost: $38.5M over 10 years

  3. Static Snapshot: Airborne Provides intermediate wavelength gravity data Reconciles terrestrial datasets Fills in spatial gaps in the littoral region Terrestrial gravity points 20-100 km gravity gaps along coast Ship gravitytracks New Orleans

  4. Results: 2006 Joint NGS and NRL Airborne Survey Difference with upward-continued gravity field Resulting changes in geoid from new gravity data

  5. Monitoring Change: Terrestrial Uplift: tectonic, GIA Subsidence: sediment compaction, tectonic, water/oil pumping, GIA Ave. Subsidence: 5.2 ± 0.9 mm/yr ――> 3 yrs: 1.56 cm ――> 6.3 μGal change ~7 mm/yr wrt sl Dokka, et al. (2006) GRL Dokka, et al. (2006) GRL

  6. Collaboration • Other U.S. Agencies: Provide a common national model • NGA • USGS • USACE • FEMA • To better tie work of the whole of government • Other Countries: Provide a common regional model • Canada • Mexico • Caribbean nations • Geoid is long wavelength • Transparency across borders with a seamless model

  7. Collaboration • International Organizations • International Association of Geodesy • North American Geoid: • IAG CP 2.2 • Chair: Roman • Canada and Mexico are members • Theoretical Improvements: • IAG IC-SG8 • Chair: Wang • Membership from around the world • Ties with other IAG work groups • F.I.G • Working to define how new vertical datum will be implemented and accessed

  8. Scope of a North American Geoid/Vertical Datum • Google Earth image showing Hawaii to Alaska to PR/VI

  9. Additional Information The NGS 10 year plan (2008-2018) http://www.ngs.noaa.gov/INFO/NGS10yearplan.pdf The GRAV-D Project Plan http://www.ngs.noaa.gov/GRAV-D/pubs/GRAV-D_v2007_12_19.pdf Socio-Economic Benefits of CORS and GRAV-D http://www.ngs.noaa.gov/PUBS_LIB/Socio-EconomicBenefitsofCORSandGRAV-D.pdf

  10. NGS Contacts: Dan Roman (PI), Dan.Roman@noaa.gov Vicki Childers (PM), Vicki.Childers@noaa.gov Dru Smith (Chief Geodesist), Dru.Smith@noaa.gov Always begin with your state advisor: http://www.ngs.noaa.gov/ADVISORS/AdvisorsIndex.shtml NGS Information Center Phone: (301) 713-3242 E-mail: ngs.infocenter@noaa.gov GRAV-D Website http://www.ngs.noaa.gov/grav-d Additional Information

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