Oriented surface RD (ellipsoids)

• Oblate: a > b

• Sphere: a = b

• Prolate: a < b

Example:

RD_AIRY Airy 1830

a = 6 377 563,396 flattening = 1/299,324 964 6

flattening = (a-b)/a

b = a·(1-flattening)

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