Hi,

> Distances are selected by the user using a dropdownlist in the range of .25
> to 4 miles.

A 4 miles square section of the earth is going to be fairly close to flat. A  
pythagorean distance formula is very likely to give errors of < 20 feet over 
that range. A quick google search suggests 8 inches curvature/mile which is 
going to be less than real life topological features.

Justin

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