The NGS GEOID Page

First created 3/01/2000 DAS
Last updated 12/18/2008 WCW

Latest models



What is the geoid?

(Definition, History)

What is a deflection
of the vertical?under construction

(Definition, History)


geoid and deflection models has NGS made in the last decade?

(Updated 1/4/2001 to include the 1990-1994 models)



Comparison of the latest models with other geoid models under construction


Geoid Links

(Agencies, Models)

Research Links

(Projects at least loosely tied to the geoid)

North American Geoidunder construction

International Association of Geodesy Commission Project 2.2

Online papers about the geoid

Who uses the geoid?

(Studies with NGS geoid models)

NGS geoid research software


Online slideshow presentations


Absolute Gravimeter


Cryogenic Gravimeter

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