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  2. Gravity of Earth - Wikipedia

    en.wikipedia.org/wiki/Gravity_of_Earth

    Gravity anomaly map from GRACE. Currently, the static and time-variable Earth's gravity field parameters are determined using modern satellite missions, such as GOCE, CHAMP, Swarm, GRACE and GRACE-FO. [21] [22] The lowest-degree parameters, including the Earth's oblateness and geocenter motion are best determined from satellite laser ranging. [23]

  3. Gravity map - Wikipedia

    en.wikipedia.org/wiki/Gravity_map

    A gravity map is a map that depicts gravity measurements across an area of space, which are typically obtained via gravimetry. Gravity maps are an extension of the field of geodynamics. Readings are typically taken at regular intervals for surface analysis on Earth. [1] Other methods include analysis of artificial satellite orbital mechanics ...

  4. Earth Gravitational Model - Wikipedia

    en.wikipedia.org/wiki/Earth_Gravitational_Model

    Earth Gravitational Model 2008 (EGM2008) GeographicLib provides a utility GeoidEval (with source code) to evaluate the geoid height for the EGM84, EGM96, and EGM2008 Earth gravity models. Here is an online version of GeoidEval.

  5. GRACE and GRACE-FO - Wikipedia

    en.wikipedia.org/wiki/GRACE_and_GRACE-FO

    The Gravity Recovery and Climate Experiment (GRACE) was a joint mission of NASA and the German Aerospace Center (DLR). Twin satellites took detailed measurements of Earth's gravity field anomalies from its launch in March 2002 to the end of its science mission in October 2017.

  6. Gravity anomaly - Wikipedia

    en.wikipedia.org/wiki/Gravity_anomaly

    The gravity anomaly at a location on the Earth's surface is the difference between the observed value of gravity and the value predicted by a theoretical model. If the Earth were an ideal oblate spheroid of uniform density, then the gravity measured at every point on its surface would be given precisely by a simple algebraic expression.

  7. World Geodetic System - Wikipedia

    en.wikipedia.org/wiki/World_Geodetic_System

    Also available was an advanced least squares method called collocation that allowed for a consistent combination solution from different types of measurements all relative to the Earth's gravity field, measurements such as the geoid, gravity anomalies, deflections, and dynamic Doppler. The new world geodetic system was called WGS 84.

  8. GOCE - Wikipedia

    en.wikipedia.org/wiki/GOCE

    The Gravity Field and Steady-State Ocean Circulation Explorer (GOCE) was the first of ESA's Living Planet Programme heavy satellites intended to map in unprecedented detail the Earth's gravity field. The spacecraft's primary instrumentation was a highly sensitive gravity gradiometer consisting of three pairs of accelerometers which measured ...

  9. Physical geodesy - Wikipedia

    en.wikipedia.org/wiki/Physical_geodesy

    The weight of an object on Earth's surface is the downwards force on that object, given by Newton's second law of motion, or F = m a (force = mass × acceleration). Gravitational acceleration contributes to the total gravity acceleration, but other factors, such as the rotation of Earth, also contribute, and, therefore, affect the weight of the ...

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