Gravity and the Geoid at NGS

04/12/2000


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Table of Contents

Gravity and the Geoid at NGS

Topics of Discussion

Review of Height Systems

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Geoid Modeling

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Data Contributions

Need: Gravity Measurements

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Need: Digital Elevation Models

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Step 1: Grid Bouguer Anomalies

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Step 2: Compute EGM96 gravity anomalies

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Step 3: Residual Free-air anomalies

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Step 4: The Stokes Integral

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Step 5: Compute EGM96 geoid undulations

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Step 6: G99SSS

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Need: GPS on Benchmarks

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Step 7: Conversion Surface

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GEOID99

GEOID96 vs GEOID99

GPS-derived Orthometric heights

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Future Directions

Summary

ON-LINE NGS GEOID RESOURCES

 Author: Dru A. Smith

Email: dru@ngs.noaa.gov

Home Page: http://www.ngs.noaa.gov/GEOID