Hi Gunther,
You've got the start/end points opposite for those two queries - the
routes aren't the same (and thus, are very different in duration.. If you
swap the start/end points on the OSRM route, you'll get 6.7 minutes as the
result, and the path matches what Google is returning.
Make sure you zoom in in the UI and make sure the coordinates have
snapped to the same location for both routing engines if you're doing a
comparison.
To answer the rest of your question, OSRM uses:
1) Tag information available in OpenStreetMap to decide on road speeds.
2) The OSRM demo server *also* has Mapbox traffic data loaded on top
If you run your own OSRM server, you will just get (1).
You can read through the script that decides on OSM-based speeds here:
https://github.com/Project-OSRM/osrm-backend/blob/master/profiles/car.lua
This script looks at tags on OSM ways and decides on a basic speed for
every road.
daniel
On Mon, Nov 27, 2017 at 9:41 AM, Günther S <guenther_...@yahoo.de> wrote:
> Hi there,
>
> I would like to know how the "duration" is calculated exactly.
> What is the data basis for this calculation?
> - predefined speed per segment (where to get that speed)?
> - is real traffic information somehow considered?
>
> For instance:
> this request returns 1037.9sec = 17.3 min
> http://router.project-osrm.org/route/v1/driving/5.39952890748535,52.
> 1960411446193;5.4446426827156,52.1682341727178?overview=false
>
>
> on the other hand, google calculates 7min for the fastest route:
> https://www.google.at/maps/dir/52.1682341727178+5.
> 4446426827156/52.1960411,5.3995289/@52.1889039,5.387444,
> 14z/data=!3m1!4b1!4m7!4m6!1m3!2m2!1d5.4446427!2d52.1682342!1m0!3e0?hl=en
>
> thanks,
> Guenther
>
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> OSRM-talk@openstreetmap.org
> https://lists.openstreetmap.org/listinfo/osrm-talk
>
>
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