libpysal.cg.arcdist2linear¶
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libpysal.cg.
arcdist2linear
(arc_dist, radius=6371.0)[source]¶ Convert an arc distance (spherical earth) to a linear distance (R3) in the unit sphere.
Examples
>>> pt0 = (0,0) >>> pt1 = (180,0) >>> d = arcdist(pt0,pt1,RADIUS_EARTH_MILES) >>> d == math.pi*RADIUS_EARTH_MILES True >>> arcdist2linear(d,RADIUS_EARTH_MILES) 2.0