If your displacements aren't too great (less than a few kilometers) and you're not right at the poles, use the quick and dirty estimate that 111,111 meters (111.111 km) in the y direction is 1 degree (of latitude) and 111,111 * cos(latitude) meters in the x direction is 1 degree (of longitude).

http://www.mclimatiano.com/faster-sine-approximation-using-quadratic-curve/



In [1]:

    
function diff_in_m(lat1, lon1, lat2, lon2)

end









    Out[1]:





diff_in_m (generic function with 1 method)



In [1]:

    
200/3.6*0.1









    Out[1]:





5.555555555555556



In [2]:

    
4*3.6*10









    Out[2]:





144.0



In [5]:

    
(144-80)/3.6









    Out[5]:





17.77777777777778



In [7]:

    
log(6)/log(2)









    Out[7]:





2.584962500721156



In [8]:

    
2^3









    Out[8]:





8

Value can be scaled as needed.

Calculate each value to match the real difference to the cumulative sum of the points.



In [ ]: