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  1. World Geodetic System 1984

    Linked via "WGS 84 (G873)"

    While the defining constants of the WGS 84 ellipsoid (as presented in the table above) are fixed, the practical realization of the reference frame-—how the points on the Earth's surface are mapped to the ellipsoid—has evolved to accommodate plate tectonics and system improvements. This is captured in sequential realizations of the WGS 84 frame.
    The official structure of WGS 84 is defined by **[WG…

  2. World Geodetic System 1984

    Linked via "WGS 84 (G873)"

    | Realization | Epoch of Parameters | Primary Update Source | Application Status |
    | :--- | :--- | :--- | :--- |
    | WGS 84 (G873)/) | 1987.0 | Initial GPS Data Set | Baseline Definition |
    | WGS 84 (G1150)/) | 1992.0 | Inclusion of IERS Data | GPS Standard Frame |
    | WGS 84 (G1762)/) | 1996.0 | Enhanced Antarctic Baselines | Standardized for Oceanic Mapping |

  3. World Geodetic System 1984

    Linked via "G873"

    | WGS 84 (G2139)/) | 2000.0 | Adjustment for Lunar Laser Ranging (LLR) Artifacts | Current Navigational Default |
    It is imperative to note that all these realizations utilize the identical ellipsoid parameters ($a$ and $f$). The differences lie solely in the transformation parameters that map coordinates from the instantaneous physical surface (the realization) back to the fixed, idealized [ellipsoid model](/entries/ellipsoid-m…