The NGS GEOID Page

First created 3/01/2000. DAS.

Last updated 4/22/2008. DRR.

What is the geoid? (Definition, History)	What is a deflection of the vertical? (Definition, History)	What geoid and deflection models has NGS made in the last decade? (Updated 1/4/2001 to include the 1990-1994 models)
The latest models: GEOID03, USGG2003, GEOID99, G99SSS , G99BM , and DEFLEC99 The GEOID03 model has been updated for southern Louisiana
Comparison of the latest models with other geoid models
Geoid Links (Agencies, Models)	Research Links (Projects at least loosely tied to the geoid)	North American Geoid 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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