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 and Earth's rotation, if other influences such as winds and tides were absent.

The National Geodetic Survey has released updated models for transforming heights between ellipsoidal coordinates and physical height systems that relate to water flow.

What is the geoid? The geoid is a model of global mean sea level that is used to measure precise surface elevations. A depiction of the United States geoid. Areas in yellow and orange have a …

A geoid is the irregular-shaped “ball” that scientists use to more accurately calculate depths of earthquakes, or any other deep object beneath the earth’s surface. Currently, we use the “WGS84” version (World Geodetic System of 1984).

geoid, model of the figure of Earth —i.e., of the planet’s size and shape—that coincides with mean sea level over the oceans and continues in continental areas as an imaginary sea-level surface defined by spirit level. It serves as a reference surface that can be used to measure precise elevations of Earth’s surface features.

Under the continents the geoid is not directly accessible but is rather the surface to which water would rise if narrow canals were cut through the continents from ocean to ocean. The relationships between land and ocean surfaces, ellipsoid and geoid, are shown in the figure.

To meet this need, the geoid, a shape that refers to global mean sea level, was created. If the geoid really existed, the surface of the Earth would be equal to a level in between the high-tide and low-tide marks. Although a geoid may seem to be a smooth, regular shape, it isn't.

The meaning of GEOID is the surface within or around the earth that is everywhere normal to the direction of gravity and coincides with mean sea level in the oceans.

Apr 11, 2023 · Geoid is defined as an equipotential surface of the Earth’s gravity field that coincides with the mean sea level. It is an imaginary surface that closely approximates the shape of the Earth, taking into account the irregularities in the distribution of mass within the Earth.

The geoid is the surface of an ideal global ocean in the absence of tides and currents, shaped only by gravity. The colours in the image represent deviations in height from an ideal geoid. Visualise, analyse or process the data. Learn about the data and how to access it.