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The Mercator projection is a cylindrical map projection presented by the Flemish geographer and cartographer Gerardus Mercator in 1569.

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a localised 2D coordinate system from GPS coordinates

Like Mercator or transverse mercator. Web-mercator is apparently a no-no because it's not conformal. A secant projection (instead of tangent) would minimise the deviation in z (height)? …
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