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March 4, 2012Journal of Geophysical Research Atmospheres

The development and evaluation of the Earth Gravitational Model 2008 (EGM2008)

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Authors

NPNikolaos K. PavlisSHS. A. HolmesSKS. Kenyon

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Overview

Modeling study demonstrates global gravitational field accuracy within 5 to 10 centimeters, suggesting a single model can satisfy diverse geodetic applications.

Key Points

  • To develop and evaluate EGM2008, a high-resolution global spherical harmonic model of Earth's gravitational potential.
  • Combined the ITG-GRACE03S satellite gravitational model with a 5 arc-minute global grid of area-mean free-air gravity anomalies via least squares.
  • Merged terrestrial, altimetry-derived, and airborne gravity data, supplementing lower-resolution regions with topographic gravitational information.
  • Evaluated model performance using independent GPS/leveling data, astrogeodetic vertical deflections, and satellite orbit calculations.
  • EGM2008 achieved spherical harmonic completeness to degree and order 2159 (with coefficients up to degree 2190), improving resolution sixfold over EGM96.
  • Geoid undulation discrepancies against independent GPS/leveling data were within ±5 to ±10 cm in well-surveyed regions, with accuracy improving threefold to sixfold over EGM96.
  • Vertical deflections across the USA and Australia matched independent astrogeodetic values within ±1.1 to ±1.3 arc-seconds.

Cite This Study

Pavlis et al. (2012) studied this question.

synapsesocial.com/papers/69d8ce2838c00da8b4beda90https://doi.org/10.1029/2011jb008916
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