/// <summary>
///
/// </summary>
/// <param name="this"></param>
/// <param name="lat1"></param>
/// <param name="lon1"></param>
/// <param name="mi"></param>
/// <returns></returns>
public static bool WithinMiles(this JobLocation @this, double?lat1, double?lon1, double mi)
{
if (lat1 == null || lon1 == null)
{
return(true);
}
return(@this.HaversineDistance(lat1, lon1) <= mi);
}
/// <summary>
/// Use Haversine Distance formula to calculate a distance between two points
/// </summary>
/// <param name="this"></param>
/// <param name="lat1"></param>
/// <param name="lon1"></param>
/// <returns></returns>
public static double HaversineDistance(this JobLocation @this, double?lat1, double?lon1)
{
var lat2 = @this.Latitude;
var lon2 = @this.Longitude;
var R = 3960; //miles
