How do you compute the earth's radius at a given geodetic latitude?

المشرف العام

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(I see there is an equation on wikipedia that does exactly what I am asking but there is no references. I have no way of confirming the validity of this equation!)

I already understand the difference between Geocentric Latitude vs Geodetic Latitude.

Assuming known semi major, a, and semi minor, b, radiuses are given. How do you compute the radius at a given geodetic latitude?

I need some sort of expert confirmation (derivation, link to derivation, confirmation from expert, explanation, etc).



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