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an imaginary surface that coincides with mean sea level in the ocean and its extension through the continents.
the geometric figure formed by this surface, an ellipsoid flattened at the poles.
Source: Dictionary.com
geoid | Define geoid at Dictionary.com
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Geoid - Wikipedia


The geoid is the shape that the surface of the oceans would take under the influence of Earth's ... Being an equipotential surface, the geoid is by definition a surface to which the force of gra...

What is the geoid? - NOAA's National Ocean Service


A depiction of the United States geoid. Areas in yellow and orange have a slightly stronger gravity field as a result of the Rocky Mountains. While we often think ...

What is the geoid?


Jan 30, 2001 ... geoid: The equipotential surface of the Earth's gravity field which best ... For example, altimetry is often used to define "mean sea level" in the ...

1-Mean Sea Level, GPS, and the Geoid - Esri


The geoid approximates mean sea level. ... By definition, the geoid describes the irregular shape of the earth and is the true zero surface for measuring ...

Geoid | Define Geoid at Dictionary.com


Geoid definition, an imaginary surface that coincides with mean sea level in the ocean and its extension through the continents. See more.

geoid | geology | Britannica.com


Nov 24, 2015 ... Geoid, model of the figure of Earth—i.e., of the planet's size and shape—that ... Learn how sea level is defined by using variations in Earth's ...

Geoid - definition of geoid by The Free Dictionary


The hypothetical surface of the earth that coincides everywhere with mean sea level. [German, from Greek geoeidēs, earthlike : gē, earth + -oeidēs, -oid.] ...

Explaining the Differences Between Ellipsoids, Geoids, and ...


This tutorial explains the concepts behind modelling the earth's surface using GIS techniques.