using System;

​

public class Coordinate

{

    private const double EarthRadius = 6378137;

​

    /// <summary>

    /// Converts EPSG:3857 (Web Mercator) coordinates to EPSG:4326 (WGS84).

    /// </summary>

    /// <param name="x">The x-coordinate in EPSG:3857.</param>

    /// <param name="y">The y-coordinate in EPSG:3857.</param>

    /// <returns>A tuple representing (latitude, longitude) in EPSG:4326.</returns>

    public static (double latitude, double longitude) ConvertTo4326(double x, double y)

    {

        double longitude = (x / EarthRadius) * (180 / Math.PI);

        double latitude = (Math.Atan(Math.Sinh(y / EarthRadius))) * (180 / Math.PI);

        return (latitude, longitude);

    }

​

    /// <summary>

    /// Converts EPSG:4326 (WGS84) coordinates to EPSG:3857 (Web Mercator).

    /// </summary>

    /// <param name="latitude">The latitude in EPSG:4326.</param>

    /// <param name="longitude">The longitude in EPSG:4326.</param>

    /// <returns>A tuple representing (x, y) in EPSG:3857.</returns>

    public static (double x, double y) ConvertTo3857(double latitude, double longitude)

    {

        double x = longitude * EarthRadius * Math.PI / 180;

        double y = Math.Log(Math.Tan((90 + latitude) * Math.PI / 360)) * EarthRadius;

        return (x, y);

    }

​

    public static void Main()

    {

        (double lat, double lon) = ConvertTo4326(x: -13632107.6, y: 4547289.9);

        Console.WriteLine($"EPSG:4326 - Latitude: {lat}, Longitude: {lon}");

        Console.WriteLine($"{lat},{lon}");

        Console.WriteLine("asd");

    }

}

​