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Beyond GEOID12: Implementing a New Vertical Datum for North America. Daniel R. Roman, Ph.D. Neil D Weston, Ph.D. Approximate level of error known to exist in the NAVD 88 zero elevation surface. Why isn’t NAVD 88 good enough anymore?. Available Tide Gauges. SST, TBM’s and the Geoid.

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beyond geoid12 implementing a new vertical datum for north america

Beyond GEOID12: Implementing a New Vertical Datum for North America

Daniel R. Roman, Ph.D.

Neil D Weston, Ph.D.

approximate level of error known to exist in the navd 88 zero elevation surface
Approximate level of error known to exist in the NAVD 88 zero elevation surface

Why isn’t NAVD 88 good

enough anymore?

F.I.G. Working Week 2012

6-10 May 2012 Rome, Italy

available tide gauges
Available Tide Gauges

F.I.G. Working Week 2012

6-10 May 2012 Rome, Italy

sst tbm s and the geoid
SST, TBM’s and the Geoid
  • P,T,S ≠ constant/uniform
  • Geoid + SST = LMSL (as seen at tide gauge)

SST/MODT

Local MSL

Geoid = “Global” MSL surface

F.I.G. Working Week 2012

6-10 May 2012 Rome, Italy

sst modt models
SST (MODT) Models

Foreman et al. 2004

Thompson-Demiorov 2006

F.I.G. Working Week 2012

6-10 May 2012 Rome, Italy

tide gauge comparisons limited to where sst models exist
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

current grav d coverage
Current GRAV-D Coverage

GRAV-D: Gravity for the Redefinition of the American Vertical Datum

F.I.G. Working Week 2012

6-10 May 2012 Rome, Italy

summary
Summary
  • NAVD 88 is insufficient to meet cm-level needs
  • Must use highly accurate gravimetric geoid
  • New W0 best fits most Tide Gauges
    • SST models remove significant variability in LMSL
    • Same W0 value adopted by IAU and IERS
    • Neglects Arctic but also Mexico & Caribbean

F.I.G. Working Week 2012

6-10 May 2012 Rome, Italy

summary1
Summary
  • U.S.A & Canada have agreed to use this W0
    • Will serve as Canadian Vertical Datum in 2013
    • It is the likely value for U.S. in 2022
  • GRAV-D aerogravity will bridge gap
    • Satellite gravity models will provide unification
    • Surface gravity & DEM’s give high frequency
    • Aim is for cm-level accuracy in geoid and GNSS

F.I.G. Working Week 2012

6-10 May 2012 Rome, Italy