Keyword Analysis & Research: geoid

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  • Geoid - Wikipedia

    wikipedia.org:443

    https://en.wikipedia.org:443/wiki/Geoid

    WEBThe geoid (/ ˈ dʒ iː. ɔɪ d / 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.

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  • Understanding Geographic Identifiers (GEOIDs) - Census.gov

    census.gov:443

    https://www.census.gov:443/programs-surveys/geography/guidance/geo-identifiers.html

    WEBOct 8, 2021 · 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 …

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  • What is a Geoid? Why do we use it and where does its shape come …

    usgs.gov:443

    https://www.usgs.gov:443/faqs/what-a-geoid-why-do-we-use-it-and-where-does-its-shape-come

    WEBA 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). If Earth were a perfect sphere, calculations of depth and distances would be easy because we know ...

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  • Geoid | Definition & Examples | Britannica

    britannica.com:443

    https://www.britannica.com:443/science/geoid

    WEBGeoid, 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).

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

    noaa.gov:443

    https://oceanservice.noaa.gov:443/facts/geoid.html

    WEBThe 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 slightly stronger gravity field as a result of the Rocky Mountains.

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  • What is the geoid? | NGS Facts | NGS INFO - About Us | National

    noaa.gov:443

    https://geodesy.noaa.gov:443/INFO/facts/geoid.shtml

    WEBThe 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 slightly stronger gravity field as a result of the Rocky Mountains.

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  • Geoid - Earth's Shape, Gravity, Sea Level | Britannica

    britannica.com:443

    https://www.britannica.com:443/science/geoid/The-concept-of-the-geoid

    WEBThe geoid is in essence an equipotential surface of the actual gravitational field. In the vicinity of a local mass excess that adds potential Δ U to the normal Earth’s potential at a point, the surface must warp outward in order to keep the total potential constant.

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  • The Geoid: Why a map of Earth's gravity yields a potato-shaped …

    scientificamerican.com:443

    https://blogs.scientificamerican.com:443/observations/the-geoid-why-a-map-of-earths-gravity-yields-a-potato-shaped-planet/

    WEBApr 1, 2011 · The geoid is, in the words of an oceanographer on the GOCE team, a surface such that if you placed a marble anywhere on it, it would stay there rather than rolling in any direction. Another way...

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  • The Geoid: Global Positioning Tutorial - NOAA's National Ocean Service

    noaa.gov:443

    https://oceanservice.noaa.gov:443/education/tutorial_geodesy/geo03_figure.html

    WEBThe Geoid. Global Positioning Tutorial. Because the surface of the Earth is irregular and complex, geodesists use simplified mathematical models of the Earth for many applications. The simplest model of the Earth is a sphere. A much more complex model of the Earth is the geoid, used to approximate mean sea level.

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  • Geoid Determination, Theory and Principles | SpringerLink

    springer.com:443

    https://link.springer.com:443/referenceworkentry/10.1007/978-3-030-10475-7_154-1

    WEBSep 7, 2020 · Definition. The geoid is the equipotential surface of the Earth’s gravity field, which best approximates the mean sea level at rest.

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