Determining and n and the impact on the new vertical datum for north america
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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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Determining 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

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


Static snapshot airborne

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


Results 2006 joint ngs and nrl airborne survey

Results: 2006 Joint NGS and NRL Airborne Survey

Difference with upward-continued gravity field

Resulting changes in geoid from new gravity data


Monitoring change terrestrial

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


Collaboration

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


Collaboration1

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


Scope of a north american geoid vertical datum

Scope of a North American Geoid/Vertical Datum

  • Google Earth image showing Hawaii to Alaska to PR/VI


Determining and n and the impact on the new vertical datum for north america

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


Determining and n and the impact on the new vertical datum for north america

NGS Contacts:

Dan Roman (PI), [email protected]

Vicki Childers (PM), [email protected]

Dru Smith (Chief Geodesist), [email protected]

Always begin with your state advisor:

http://www.ngs.noaa.gov/ADVISORS/AdvisorsIndex.shtml

NGS Information Center

Phone: (301) 713-3242

E-mail: [email protected]

GRAV-D Website

http://www.ngs.noaa.gov/grav-d

Additional Information


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