var location = new Location(37.7749, -122.4194); // San Francisco
var locationWithAlt = new Location(37.7749, -122.4194, 100.5);
// Calculate distance between two locations
var sf = new Location(37.7749, -122.4194);
var la = new Location(34.0522, -118.2437);
double distanceKm = sf.DistanceTo(la); // ~559 km