Discover and read the best of Twitter Threads about #geoids
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This is a map of sea level, exaggerated 10,000 times.
Why is it so weird and lumpy? Sea level is not defined by distance from Earth's center - it's an equal-gravity surface.
Understanding the #geoid is key to understanding #climatechange impacts. 1/7
en.wikipedia.org/wiki/Geoid
Why is it so weird and lumpy? Sea level is not defined by distance from Earth's center - it's an equal-gravity surface.
Understanding the #geoid is key to understanding #climatechange impacts. 1/7
en.wikipedia.org/wiki/Geoid
The "lumpiness" comes from variations in density and topography. Mountains have gravity, so the #geoid is generally higher in mountainous regions. But inside the Earth there are variations, too - from the different kinds of rocks and the thickness of the crust. 2/7
Elevations on Earth are defined relative to the geoid. So every time you look at a topographic map, there's a secret geoid hidden behind that data! 3/7
