Explore: Geoid

The geoid (/ˈdʒiː.ɔɪd/ JEE-oyd) is the shape that the ocean surface would take under the influence of the gravity of Earth, including gravitational attraction

authors, such as the United States Census Bureau, use the abbreviation "GEOID" as a synonym for geocode. Geocodes are mainly used (in general as an atomic

The Indian Ocean Geoid Low (IOGL) is a gravity anomaly in the Indian Ocean. A circular region in the Earth's geoid, situated just south of the Indian

and gravimetric geoids. By matching the relative astro-geodetic geoids of the selected datums with an earth-centered gravimetric geoid, the selected datums

and longitude. In the first step the physical surface is modeled by the geoid, a surface which approximates the mean sea level over the oceans and its

anomalies, defines the geoid of the Earth, which approximates the local mean sea level for locations in the open ocean. The geoid includes a significant

separation between the geoid and the reference ellipsoid is called the undulation of the geoid, symbol N {\displaystyle N} . The geoid, or mathematical mean

the study of Earth's gravitational field is called physical geodesy. The geoid essentially is the figure of Earth abstracted from its topographical features

between the two, referred to as geoid undulations, geoid heights, or geoid separations, will be irregular as well. The geoid is a surface along which the

ellipsoid. This difference is the geoid height, positive above or outside the ellipsoid, negative below or inside. The geoid height variation is under 110 m