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// Example of using the GeographicLib::LambertConformalConic class
#include <iostream>
#include <exception>
#include <GeographicLib/LambertConformalConic.hpp>
using namespace std;
using namespace GeographicLib;
int main() {
try {
// Define the Pennsylvania South state coordinate system EPSG:3364
// http://www.spatialreference.org/ref/epsg/3364/
const double
a = Constants::WGS84_a(),
f = 1/298.257222101, // GRS80
lat1 = 40 + 58/60.0, lat2 = 39 + 56/60.0, // standard parallels
k1 = 1, // scale
lat0 = 39 + 20/60.0, lon0 =-77 - 45/60.0, // origin
fe = 600000, fn = 0; // false easting and northing
// Set up basic projection
const LambertConformalConic PASouth(a, f, lat1, lat2, k1);
double x0, y0;
// Transform origin point
PASouth.Forward(lon0, lat0, lon0, x0, y0);
x0 -= fe; y0 -= fn;
{
// Sample conversion from geodetic to PASouth grid
double lat = 39.95, lon = -75.17; // Philadelphia
double x, y;
PASouth.Forward(lon0, lat, lon, x, y);
x -= x0; y -= y0;
cout << x << " " << y << "\n";
}
{
// Sample conversion from PASouth grid to geodetic
double x = 820e3, y = 72e3;
double lat, lon;
x += x0; y += y0;
PASouth.Reverse(lon0, x, y, lat, lon);
cout << lat << " " << lon << "\n";
}
}
catch (const exception& e) {
cerr << "Caught exception: " << e.what() << "\n";
return 1;
}
return 0;
}
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