Why the Earth is not a sphere and how we map it
In short: The Earth is a jagged, bulging rock, yet we navigate it using flat maps. This video explains the mathematical models—ellipsoids and geoids—that allow scientists to represent our irregular planet with minimal distortion.
Geodesy provides the framework for professional surveying and GIS. Because the Earth is non-spherical, scientists use different models depending on the goal: ellipsoids are used for measuring distances, while geoids represent a vertical datum based on mean sea level.
The video also explores projection mechanics, detailing how planar, conical, and cylindrical projections work. It specifically examines why the Mercator projection remains a standard for platforms like Google Maps.
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Sources
- Summary by Intellect · source: Geodesy 101: How We Model the Earth for Surveying
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