When Calcuating Distance Between Points On Earth Why Are My Haversine Vs. Geodesic Calculations Diverging?
I am getting wildly diverging distances using two approximations to calculate distance between points on Earth's surface. I am using the Haversine (vectorized) approximation and th
Solution 1:
The Haversine formula calculates distances between points on a sphere (the great-circle distance), as does geopy.distance.great_circle.
On the other hand, geopy.distance.geodesic calculates distances between points on an ellipsoidal model of the earth, which you can think of as a "flattened" sphere.
The difference isn't due to rounding so much as they use different formulas, with the geodesic formula more accurately modeling the true shape of the earth.
Solution 2:
There was a matrix algebra error in the Haversine formula. I updated the code in the question. I am getting much better agreement between Haversine and geodesic now:
On my actual dataset:
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