iwfm.gis.distance_sphere¶ iwfm.gis.distance_sphere(p1, p2, units='km')[source]¶ Use the Haversine formula to calculate the distance between two (lat,lon) points on a sphere. p1 = [lat1,lon1], p2 = [lat2,lon2] in degrees units = ‘km’ (default), ‘mi’ for miles, or ‘ft’ for feet Parameters: p1 (list) – lat, lon coordinates of a point in degrees p2 (list) – lat, lon coordinates of a point in degrees units (str, default='km') – distance units: ‘km’,’mi’ or ‘ft’ Returns: distance – distance between p1 and p2 Return type: float