37 lines
968 B
C++
37 lines
968 B
C++
// Example of using the GeographicLib::Gnomonic class
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#include <iostream>
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#include <exception>
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#include <GeographicLib/Geodesic.hpp>
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#include <GeographicLib/Gnomonic.hpp>
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using namespace std;
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using namespace GeographicLib;
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int main() {
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try {
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Geodesic geod(Constants::WGS84_a(), Constants::WGS84_f());
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// Alternatively: const Geodesic& geod = Geodesic::WGS84();
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const double lat0 = 48 + 50/60.0, lon0 = 2 + 20/60.0; // Paris
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Gnomonic proj(geod);
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{
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// Sample forward calculation
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double lat = 50.9, lon = 1.8; // Calais
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double x, y;
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proj.Forward(lat0, lon0, lat, lon, x, y);
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cout << x << " " << y << "\n";
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}
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{
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// Sample reverse calculation
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double x = -38e3, y = 230e3;
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double lat, lon;
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proj.Reverse(lat0, lon0, x, y, lat, lon);
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cout << lat << " " << lon << "\n";
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}
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}
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catch (const exception& e) {
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cerr << "Caught exception: " << e.what() << "\n";
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return 1;
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}
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}
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