examples/example-Geodesic-small.cpp

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// Small example of using the GeographicLib::Geodesic class
 
#include <iostream>
#include <GeographicLib/Geodesic.hpp>
 
using namespace std;
using namespace GeographicLib;
 
int main() {
  const Geodesic& geod = Geodesic::WGS84();
  // Distance from JFK to LHR
  double
    lat1 = 40.6, lon1 = -73.8, // JFK Airport
    lat2 = 51.6, lon2 = -0.5;  // LHR Airport
  double s12;
  geod.Inverse(lat1, lon1, lat2, lon2, s12);
  cout << s12 / 1000 << " km\n";
}