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    Re: The magical maths of Google Maps
    From: Robin Stuart
    Date: 2015 Oct 7, 14:30 -0700

    Lu,

        You are not matching the curvature at the poles you are actually matching the diameters.

    Slice the Earth through a meridian and you get an ellipse that is wider at the equator that the poles. The curvature of this elliptical curve is greatest at the equator and least at the poles. If you are traveling along a meridian you have gone 1° in latitude when the direction of your vertical has changed by 1°. Because the curvature decreases the higher in latitude you go you need to move further on the ground for that to happen,

    Robin Stuart

       
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