Compute an intermediate point between two reference points using the Haversine formula.
If ratio is 0, the returned position is pos1.
If ratio is 1, the returned position is pos2.
If ratio is 0.5, the returned position is halfway pos1 pos2 in distance.
Compute an intermediate point between two reference points using the Haversine formula. If ratio is
0, the returned position is pos1. If ratio is1, the returned position is pos2. If ratio is0.5, the returned position is halfway pos1 pos2 in distance.