ClemensFischer/XAML-Map-Control
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Removed LocationEx

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ClemensF 2021-02-13 18:50:30 +01:00
parent 41eed76055
commit 746a21854a
3 changed files with 92 additions and 93 deletions
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50
MapControl/Shared/Location.cs
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@ -99,5 +99,55 @@ namespace MapControl
return longitude;
}
/// <summary>
/// Calculates the great circle distance between this and the specified Location.
/// https://en.wikipedia.org/wiki/Great_circle
/// https://en.wikipedia.org/wiki/Great-circle_distance
/// https://en.wikipedia.org/wiki/Great-circle_navigation
/// </summary>
public double GetDistance(
Location location, double earthRadius = MapProjection.Wgs84EquatorialRadius)
{
var lat1 = latitude * Math.PI / 180d;
var lon1 = longitude * Math.PI / 180d;
var lat2 = location.latitude * Math.PI / 180d;
var lon2 = location.longitude * Math.PI / 180d;
var sinLat1 = Math.Sin(lat1);
var cosLat1 = Math.Cos(lat1);
var sinLat2 = Math.Sin(lat2);
var cosLat2 = Math.Cos(lat2);
var sinLon12 = Math.Sin(lon2 - lon1);
var cosLon12 = Math.Cos(lon2 - lon1);
var a = cosLat1 * sinLat2 - sinLat1 * cosLat2 * cosLon12;
var b = cosLat2 * sinLon12;
var s12 = Math.Atan2(Math.Sqrt(a * a + b * b), sinLat1 * sinLat2 + cosLat1 * cosLat2 * cosLon12);
return earthRadius * s12;
}
/// <summary>
/// Calculates the Location on a great circle at the specified azimuth angle and distance from this Location.
/// https://en.wikipedia.org/wiki/Great_circle
/// https://en.wikipedia.org/wiki/Great-circle_navigation
/// </summary>
public Location GetLocation(
double azimuth, double distance, double earthRadius = MapProjection.Wgs84EquatorialRadius)
{
var s12 = distance / earthRadius;
var az1 = azimuth * Math.PI / 180d;
var lat1 = latitude * Math.PI / 180d;
var lon1 = longitude * Math.PI / 180d;
var sinS12 = Math.Sin(s12);
var cosS12 = Math.Cos(s12);
var sinAz1 = Math.Sin(az1);
var cosAz1 = Math.Cos(az1);
var sinLat1 = Math.Sin(lat1);
var cosLat1 = Math.Cos(lat1);
var lat2 = Math.Asin(sinLat1 * cosS12 + cosLat1 * sinS12 * cosAz1);
var lon2 = lon1 + Math.Atan2(sinS12 * sinAz1, (cosLat1 * cosS12 - sinLat1 * sinS12 * cosAz1));
return new Location(lat2 * 180d / Math.PI, lon2 * 180d / Math.PI);
}
}
}