Altitude on Google Maps (need help)

    It is necessary to fasten to the Google map the ability to show the user the elevation difference on the route (as here ). I rummaged at API docks for a long time and didn’t find anything like it (maybe I’ve looked badly?).
    Has any of the harazhiteli faced a similar problem? How to at least pull out the altitude parameter for a specific point on the map?
    Perhaps there is some service with its api that distributes such information? The installation of various mapservers is considered last.
    Please poke your nose.

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