public void DistanceTo_ReturnsCorrectResult()
{
//http://en.wikipedia.org/w/index.php?title=Great-circle_distance&oldid=414838052
var a = new GeoName { Latitude = 36.1172, Longitude = -86.6672 }; //Nashville International Airport (BNA) in Nashville, TN, USA: N 36°7.2', W 86°40.2'
var b = new GeoName { Latitude = 33.9344, Longitude = -118.4 }; //Los Angeles International Airport (LAX) in Los Angeles, CA, USA: N 33°56.4', W 118°24.0'
var x1 = a.DistanceTo(b); // DistanceTo(GeoName) overload
var x2 = a.DistanceTo(b.Latitude, b.Longitude); // DistanceTo(double, double) overload
var actual = 2887.26; // According to wikipedia
//We use a slightly different radius of the earth than the wikipedia example uses (6372.8 in wikipedia vs. 6371 which is most commonly used)
Assert.AreEqual(actual, x1, actual * .0005); // All we want is to be within .05% of the "actual" (according to wikipedia) value
Assert.AreEqual(actual, x2, actual * .0005); // All we want is to be within .05% of the "actual" (according to wikipedia) value
//Actually, we're only 0,0135% off...
}
public void DistanceTo_WorksOnAllIGeoLocationObjects()
{
var gn = new GeoName { Latitude = 50.0333, Longitude = 16.2833 };
var en = new ExtendedGeoName { Latitude = 55.5075, Longitude = 31.85 };
var pc = new Postalcode { Latitude = 51.5558, Longitude = 5.6903 };
var a = gn.DistanceTo(en);
var b = gn.DistanceTo(pc);
var c = gn.DistanceTo(gn);
var d = en.DistanceTo(gn);
var e = en.DistanceTo(pc);
var f = en.DistanceTo(en);
var g = pc.DistanceTo(gn);
var h = pc.DistanceTo(en);
var i = pc.DistanceTo(pc);
}
public void DistanceTo_WrapsAroundLongitudeCorrectly()
{
var a = new GeoName { Latitude = 51.377020, Longitude = 179.431888, Name = "Amchitka Island" };
var b = new GeoName { Latitude = 51.272322, Longitude = -179.134396, Name = "Amatignak Island" };
var actual = 100.3; // +/- a bit; checked with http://www.freemaptools.com/measure-distance.htm and (classic) google maps measure tool
var result = a.DistanceTo(b);
Assert.AreEqual(actual, result, actual * .0005); // All we want is to be within .05% of the "actual" (according to our own measurements) value
}