# datum

## abstraction

Source: Wikipedia

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Occurs in:

- atmosphere_datum~vertical~tidal~msl_air__static_pressure
- atmosphere_datum~vertical~tidal~msl_air_flow__dynamic_pressure
- atmosphere_datum~vertical~tidal~msl_air_flow__total_pressure
- earth_datum_ellipsoid__eccentricity
- earth_datum_ellipsoid__equatorial_radius
- earth_datum_ellipsoid__flattening_ratio
- earth_datum_ellipsoid__inverse_of_flattening_ratio
- earth_datum_ellipsoid__polar_radius
- earth_datum_ellipsoid__second_flattening_ratio
- earth_datum_ellipsoid__third_flattening_ratio
- earth_datum_ellipsoid_surface_point-pair_geodesic__distance