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// Example of using the GeographicLib::Ellipsoid class
#include <iostream>
#include <iomanip>
#include <exception>
#include <GeographicLib/Ellipsoid.hpp>
using namespace std;
using namespace GeographicLib;
int main() {
try {
Ellipsoid wgs84(Constants::WGS84_a(), Constants::WGS84_f());
// Alternatively: const Ellipsoid& wgs84 = Ellipsoid::WGS84();
cout << "The latitude half way between the equator and the pole is "
<< wgs84.InverseRectifyingLatitude(45) << "\n";
cout << "Half the area of the ellipsoid lies between latitudes +/- "
<< wgs84.InverseAuthalicLatitude(30) << "\n";
cout << "The northernmost edge of a square Mercator map is at latitude "
<< wgs84.InverseIsometricLatitude(180) << "\n";
cout << "Table phi(deg) beta-phi xi-phi mu-phi chi-phi theta-phi (mins)\n"
<< fixed << setprecision(2);
for (int i = 0; i <= 90; i += 15) {
double phi = i,
bet = wgs84.ParametricLatitude(phi),
xi = wgs84.AuthalicLatitude(phi),
mu = wgs84.RectifyingLatitude(phi),
chi = wgs84.ConformalLatitude(phi),
theta = wgs84.GeocentricLatitude(phi);
cout << i << " "
<< (bet-phi)*60 << " "
<< (xi-phi)*60 << " "
<< (mu-phi)*60 << " "
<< (chi-phi)*60 << " "
<< (theta-phi)*60 << "\n";
}
}
catch (const exception& e) {
cerr << "Caught exception: " << e.what() << "\n";
return 1;
}
}
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