Geoid - Wikipedia 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
Understanding Geographic Identifiers (GEOIDs) - Census. gov GEOIDs are numeric codes that uniquely identify all administrative legal and statistical geographic areas for which the Census Bureau tabulates data From Alaska, the largest state, to the smallest census block in New York City, every geographic area has a unique GEOID
What Is the Geoid? Earth’s True Shape and Sea Level The geoid is a model of Earth’s shape based purely on gravity It represents the surface where gravity’s pull is equal everywhere, corresponding roughly to where global mean sea level would sit if oceans covered the entire planet with no tides, currents, or weather
What is the geoid? - NOAAs National Ocean Service This irregular shape is called "the geoid," a surface which defines zero elevation Using complex math and gravity readings on land, surveyors extend this imaginary line through the continents
Geoid | Definition Examples | Britannica Geoid, model of Earth’s size and shape that coincides with mean sea level over the oceans and continues in continental areas as an imaginary sea-level surface It is everywhere perpendicular to the pull of gravity and approximates the shape of a regular oblate spheroid (i e , a flattened sphere)
How gravity shapes Earth - Visuals by earth online 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
GEOID Definition Meaning - Merriam-Webster 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
What Is Geoid In Geography? Understanding the Earth’s Shape Geoid is an imaginary surface that is used as a reference level for measuring elevations on the Earth’s surface It is used in physical geography and geodesy to determine the height of land and sea levels
What is the geoid? - National Oceanic and Atmospheric Administration geoid: The equipotential surface of the Earth’s gravity field which best fits, in a least squares sense, global mean sea level Even though we adopt a definition, that does not mean we are perfect in the realization of that definition