noun
- the shape that the surface of the oceans would take under the influence of Earth’s gravity and rotation alone, without other influences such as winds and tides
Usage: geodesy; technical
Examples
- The geoid provides a reference surface for measuring elevations on Earth.
- Satellite measurements help scientists map the geoid with great precision.
- The geoid differs slightly from a perfect sphere due to Earth’s rotation and mass distribution.
- GPS systems use the geoid as a reference for determining accurate heights.
- Variations in the geoid reflect differences in Earth’s gravitational field.
- The geoid is essential for creating accurate maps and navigation systems.