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#include <iostream>

#include "math.h"

typedef signed int INT32;

namespace GEO {

	const double PI = 3.14159265359;

	const double PIOVER2 = PI/2.0;

	const double TWOPI = 6.28318530718;

	const double DE2RA = 0.01745329252;

	const double RA2DE = 57.2957795129;

	const double ERAD = 6378.137;

	const double FLATTENING = 1.000000/298.257223563;// Earth flattening (WGS84)

	const double EPS = 0.000000000005;

}

using namespace std;

class GeoCalc {

public:

	  // great circle method

	static double GCAzimuth(double lat1, double lon1, double lat2, double lon2);

	// ellipsoid methods

	static double EllipsoidDistance(double lat1, double lon1, double lat2, double lon2);

};