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/Geo/GeodesicExtensions.cs
@@ -20,19 +20,18 @@
GeographicCoordinate targetGeographicCoordinate,
DistanceUnits distanceUnits)
{
var sourcePhi = Math.PI*sourceGeographicCoordinate.Latitude/180;
var targetPhi = Math.PI*targetGeographicCoordinate.Latitude/180;
var deltaPhi = Math.PI*(targetPhi - sourcePhi)/180;
var deltaLam = Math.PI*(targetGeographicCoordinate.Longitude - sourceGeographicCoordinate.Longitude)/180;
var sourcePhi = Math.PI * sourceGeographicCoordinate.Latitude / 180;
var targetPhi = Math.PI * targetGeographicCoordinate.Latitude / 180;
var deltaPhi = Math.PI * (targetPhi - sourcePhi) / 180;
var deltaLam = Math.PI * (targetGeographicCoordinate.Longitude - sourceGeographicCoordinate.Longitude) / 180;
 
var a = Math.Sin(deltaPhi / 2) * Math.Sin(deltaPhi / 2) +
Math.Cos(sourcePhi) * Math.Cos(targetPhi) *
Math.Sin(deltaLam / 2) * Math.Sin(deltaLam / 2);
 
var a = Math.Sin(deltaPhi/2)*Math.Sin(deltaPhi/2) +
Math.Cos(sourcePhi)*Math.Cos(targetPhi)*
Math.Sin(deltaLam/2)*Math.Sin(deltaLam/2);
var c = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
 
var c = 2*Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
 
return new Distance(Constants.EARTH_MEAN_RADIUS.Meters*c);
return new Distance(Constants.EARTH_MEAN_RADIUS.Meters * c);
}
}
}
}