I have 2 points with their latitude/longitude coordinates and I know that they are in a X miles radius circle (let's say 10 miles radius) somewhere on earth where it's populated (I mean not near the north pole ;) ). I would like to know if these points are very very close of each other or not. When I say very very close, I mean a few meters (let's say 30 meters).
I don't want to use the heavy formula that returns the exact distance between 2 points anywhere on earth. I'm looking for a simplified formula that would simply answer yes or no to the previous question.