NASA Releases 3D Model of Earth's Geoid, Revealing Subtle Shape Variations

NASA has unveiled a new interactive 3D model of Earth's geoid, offering a detailed visualization of the planet's gravitational field's influence on the oceans. This theoretical surface represents what the oceans would look like if only gravity acted upon them, without the effects of wind, tides, or currents.

The model, developed by NASA's Scientific Visualization Studio and based on extensive satellite data, is considered one of the most accurate representations of the geoid to date. It highlights that Earth's gravity is not uniform, causing subtle undulations in the ocean's surface. These variations, though minute on a planetary scale, are crucial for understanding Earth's shape and gravitational anomalies.

To make these subtle differences visible, NASA has exaggerated the geoid's height variations by 10,000 times in the animated model. In reality, these deviations are almost imperceptible relative to Earth's size. The agency also provides a true-scale representation where the geoid appears nearly perfectly smooth.

The interactive model allows users to rotate and examine the geoid from any angle, enhancing comprehension of how gravity shapes our planet. The data used for the model comes from the GOCO06s global gravity model, compiled from over a billion observations collected over 15 years by 19 satellites, including NASA's GRACE and ESA's GOCE missions.