ADD: new track message, Entity class and Position class

libs/geographiclib/examples/JacobiConformal.cpp

@@ -0,0 +1,43 @@
+// Example of using the GeographicLib::JacobiConformal class.
+
+#include <iostream>
+#include <iomanip>
+#include <exception>
+#include <GeographicLib/Utility.hpp>
+#include "JacobiConformal.hpp"
+
+using namespace std;
+using namespace GeographicLib;
+
+int main() {
+  try {
+    Utility::set_digits();
+    // These parameters were derived from the EGM2008 geoid; see 2011-07-04
+    // E-mail to PROJ.4 list, "Analyzing the bumps in the EGM2008 geoid".  The
+    // longitude of the major axis is -15.  These are close to the values given
+    // by Milan Bursa, Vladimira Fialova, "Parameters of the Earth's tri-axial
+    // level ellipsoid", Studia Geophysica et Geodaetica 37(1), 1-13 (1993):
+    //
+    //    longitude of major axis = -14.93 +/- 0.05
+    //    a = 6378171.36 +/- 0.30
+    //    a/(a-c) = 297.7738 +/- 0.0003
+    //    a/(a-b) = 91449 +/- 60
+    // which gives: a = 6378171.36, b = 6378101.61, c = 6356751.84
+    Math::real a = 6378137+35, b = 6378137-35, c = 6356752;
+    JacobiConformal jc(a, b, c, a-b, b-c);
+    cout  << fixed << setprecision(1)
+          << "Ellipsoid parameters: a = "
+          << a << ", b = " << b << ", c = " << c << "\n"
+          << setprecision(10)
+          << "Quadrants: x = " << jc.x() << ", y = " << jc.y() << "\n";
+    cout << "Coordinates (angle x y) in degrees:\n";
+    for (int i = 0; i <= 90; i += 5) {
+      Math::real omg = i, bet = i;
+      cout << i << " " << jc.x(omg) << " " << jc.y(bet) << "\n";
+    }
+  }
+  catch (const exception& e) {
+    cerr << "Caught exception: " << e.what() << "\n";
+    return 1;
+  }
+}