Yes. But remember there is some amount of error in any sampled point. And even with 3 points spread as far as possible in each corner leaves one corner pretty far from any of the 3 points.
3-Point leveling was the very first leveling system. It definitely helped. But the grid based leveling does a better job.
3-Point leveling was the very first leveling system. It definitely helped. But the grid based leveling does a better job.