Using the appropriate radius value, ellipsoidal calculations can be approximated with the simpler spherical calculations. Very useful when testing or trouble shooting coordinate system definitions and projection code.

Using the appropriate radius to approximate a specific ellipsoid, one can rapidly develop applications which perform useful calculations without having to develop rigorous ellipsoid code.

Being able to quickly obtain radii numbers for different ellipsoids can help in determining the ellipsoid used for a specific set of data coordinates.

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