libpysal.cg.
arcdist
(pt0, pt1, radius=6371.0)[source]¶Arc distance between two points on a sphere.
Parameters: |
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Returns: |
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Examples
>>> pt0 = (0,0)
>>> pt1 = (180,0)
>>> d = arcdist(pt0,pt1,RADIUS_EARTH_MILES)
>>> d == math.pi*RADIUS_EARTH_MILES
True