/// <summary>
/// Returns the great circle distance between two coordinates on a sphere. From
/// http://en.wikipedia.org/wiki/Great-circle_distance
/// and
/// http://stackoverflow.com/questions/6544286/calculate-distance-of-two-geo-points-in-km-c-sharp
/// </summary>
private double DistanceFromBoundsInKM(double latitude, double longitude, RegionBounds bounds)
{
double sLat1 = Math.Sin(DegreesToRadians(latitude));
double sLat2 = Math.Sin(DegreesToRadians(bounds.Latitude));
double cLat1 = Math.Cos(DegreesToRadians(latitude));
double cLat2 = Math.Cos(DegreesToRadians(bounds.Latitude));
double cLon = Math.Cos(DegreesToRadians(longitude) - DegreesToRadians(bounds.Longitude));
return(EarthsRadiusInKM * Math.Acos(sLat1 * sLat2 + cLat1 * cLat2 * cLon));
}
/// <summary>
/// Returns the great circle distance between two coordinates on a sphere. From
/// http://en.wikipedia.org/wiki/Great-circle_distance
/// and
/// http://stackoverflow.com/questions/6544286/calculate-distance-of-two-geo-points-in-km-c-sharp
/// </summary>
private double DistanceFromBoundsInKM(double latitude, double longitude, RegionBounds bounds)
{
double sLat1 = Math.Sin(DegreesToRadians(latitude));
double sLat2 = Math.Sin(DegreesToRadians(bounds.Latitude));
double cLat1 = Math.Cos(DegreesToRadians(latitude));
double cLat2 = Math.Cos(DegreesToRadians(bounds.Latitude));
double cLon = Math.Cos(DegreesToRadians(longitude) - DegreesToRadians(bounds.Longitude));
return EarthsRadiusInKM * Math.Acos(sLat1 * sLat2 + cLat1 * cLat2 * cLon);
}