1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
// Example of using the GeographicLib::AlbersEqualArea class
#include <iostream>
#include <exception>
#include <GeographicLib/AlbersEqualArea.hpp>
using namespace std;
using namespace GeographicLib;
int main() {
try {
const double
a = Constants::WGS84_a(),
f = Constants::WGS84_f(),
lat1 = 40 + 58/60.0, lat2 = 39 + 56/60.0, // standard parallels
k1 = 1, // scale
lon0 = -77 - 45/60.0; // Central meridan
// Set up basic projection
const AlbersEqualArea albers(a, f, lat1, lat2, k1);
{
// Sample conversion from geodetic to Albers Equal Area
double lat = 39.95, lon = -75.17; // Philadelphia
double x, y;
albers.Forward(lon0, lat, lon, x, y);
cout << x << " " << y << "\n";
}
{
// Sample conversion from Albers Equal Area grid to geodetic
double x = 220e3, y = -53e3;
double lat, lon;
albers.Reverse(lon0, x, y, lat, lon);
cout << lat << " " << lon << "\n";
}
}
catch (const exception& e) {
cerr << "Caught exception: " << e.what() << "\n";
return 1;
}
return 0;
}
|
