public void TestCompareTo1()
{
var a = new GlobalPosition(c1);
var b = new GlobalPosition(c1);
Assert.AreEqual(a.CompareTo(b), 0);
b.Elevation = b.Elevation + 1e-13;
Assert.AreEqual(a.CompareTo(b), 0);
b.Elevation = 100;
Assert.AreEqual(a.CompareTo(b), -1);
b.Elevation = -100;
Assert.AreEqual(a.CompareTo(b), 1);
}