I am not sure if this is what you are looking for, but try  the
"Douglas-Peucker algorithm" 
http://facstaff.unca.edu/mcmcclur/GoogleMaps/EncodePolyline/

kind regards
Trevor Seaman

On Sep 10, 8:16 pm, Quy Le <[email protected]> wrote:
> There are many algorithms to find the shortest path as A *,
> Dijkstra, ...
> But I don't know what algorithm is used to find the shortest path
> between two points in the service Direction?

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