41 lines
1.5 KiB
C#
41 lines
1.5 KiB
C#
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using System;
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namespace SimConnect.Lib
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{
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/// <summary>
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/// Provides helpers methods for latitude / longitude calculations.
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/// </summary>
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public static class LatLon
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{
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/// <summary>
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/// Defines the approximate radius of the earth in kilometers.
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/// </summary>
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public const double EarthRadiusKm = 6378.137;
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// Source: https://stackoverflow.com/questions/639695/how-to-convert-latitude-or-longitude-to-meters
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/// <summary>
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/// Calculates the distance between two coordinates.
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/// </summary>
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/// <param name="lat1">Latitude of point 1 in degrees</param>
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/// <param name="lon1">Longitude of point 1 in degrees</param>
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/// <param name="lat2">Latitude of point 2 in degrees</param>
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/// <param name="lon2">Longitude of point 2 in degrees</param>
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/// <returns></returns>
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public static double DistanceBetweenInMeters(float lat1, float lon1, float lat2, float lon2)
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{
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var distanceLat = lat2 * Math.PI / 180 - lat1 * Math.PI / 180;
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var distanceLon = lon2 * Math.PI / 180 - lon1 * Math.PI / 180;
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var a = Math.Sin(distanceLat / 2) * Math.Sin(distanceLat / 2) +
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Math.Cos(lat1 * Math.PI / 180) * Math.Cos(lat2 * Math.PI / 180) *
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Math.Sin(distanceLon / 2) * Math.Sin(distanceLon / 2);
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var c = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
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var distanceKm = EarthRadiusKm * c;
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return distanceKm * 1000;
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}
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}
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}
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