/// <summary>
/// Create a new GeoLocation from lat/long in degrees
/// </summary>
/// <param name="latitude">The latitude.</param>
/// <param name="longitude">The longitude.</param>
/// <returns></returns>
public static GeoLocation FromDegrees(double latitude, double longitude)
{
var geo = new GeoLocation
{
Latitude = latitude,
Longitude = longitude
};
geo.CheckBounds();
return geo;
}
/// <summary>
/// Calculate the great circle distance between this location and another location.
/// <seealso cref="http://en.wikipedia.org/wiki/Great-circle_distance"/>
/// </summary>
/// <param name="location">The location.</param>
/// <param name="radius">The radius of the sphere in KM. This defaults to the Earth's radius (6371.01km).</param>
/// <returns></returns>
public double GetDistanceTo(GeoLocation location, double radius = 6371.01)
{
if (radius < 0d) throw new ArgumentException("Radius must be greater than zero");
return Math.Acos(Math.Sin(LatitudeRadians) * Math.Sin(location.LatitudeRadians) +
Math.Cos(LatitudeRadians) * Math.Cos(location.LatitudeRadians) *
Math.Cos(LongitudeRadians - location.LongitudeRadians)) * radius;
}
public void TestGetDistanceToRadiusLessThanZero()
{
var toLocation = GeoLocation.FromDegrees(20, 20);
Assert.Throws <ArgumentException>(() => location.GetDistanceTo(toLocation, -1), "Radius must be greater than zero");
}
public void TestConstructorFromDegreesLongitudeTooLarge()
{
var exception = Assert.Throws <ArgumentException>(() => GeoLocation.FromDegrees(1, 185));
Assert.AreEqual(exception.Message, "Longitude must not be greater than the maximum value. (180)");
}
public void TestConstructorFromDegreesLongitudeTooSmall()
{
var exception = Assert.Throws <ArgumentException>(() => GeoLocation.FromDegrees(1, -185));
Assert.AreEqual(exception.Message, "Longitude must not be less than the minimum value. (-180)");
}
public void Setup()
{
location = GeoLocation.FromDegrees(0, 0);
}
public void Setup()
{
location = GeoLocation.FromDegrees(0, 0);
}
