# pysal.lib.cg.harcdist¶

pysal.lib.cg.harcdist(p0, p1, lonx=True, radius=6371.0)[source]

Alternative arc distance function, uses haversine formula

Parameters: p0 : first point as a tuple in decimal degrees p1 : second point as a tuple in decimal degrees lonx : boolean to assess the order of the coordinates, for lon,lat (default) = True, for lat,lon = False radius : radius of the earth at the equator as a sphere default: RADIUS_EARTH_KM (6371.0 km) options: RADIUS_EARTH_MILES (3959.0 miles) None (for result in radians) d : distance in units specified, km, miles or radians (for None)