[GraphHopper] VERY suboptimal route with via

[Florian Lohoff]

Hi,
i was playing with graphhopper results and came past this:

https://graphhopper.com/maps/?point=Neuenkirchener%20Stra%C3%9Fe%2097%2C%2033332%2C%20G%C3%BCtersloh%2C%20Deutschland&point=Forsthaus%20Lohoff%2C%2033378%2C%20Rheda-Wiedenbr%C3%BCck%2C%20Deutschland&point=51.900223%2C8.368964&vehicle=foot&locale=de-de&elevation=true&layer=Lyrk

I could not find any explanation of the route. I discovered while
playing with my route home where i couldnt explain this:

https://graphhopper.com/maps/?point=Neuenkirchener%20Stra%C3%9Fe%2097%2C%2033332%2C%20G%C3%BCtersloh%2C%20Deutschland&point=Forsthaus%20Lohoff%2C%2033378%2C%20Rheda-Wiedenbr%C3%BCck%2C%20Deutschland&point=51.900237%2C8.369672&locale=de-de&layer=Lyrk

https://graphhopper.com/maps/?point=Neuenkirchener%20Stra%C3%9Fe%2097%2C%2033332%2C%20G%C3%BCtersloh%2C%20Deutschland&point=Forsthaus%20Lohoff%2C%2033378%2C%20Rheda-Wiedenbr%C3%BCck%2C%20Deutschland&point=51.900263%2C8.370059&locale=de-de&layer=Lyrk

The via point moves 20m and the route changes drastically but it wont
use the most obvious solution. I checked the data for an unconnected
route but there is nothing. It seems graphhopper split a way in
halve and didnt reconnect it in the resulting graph.

The way in question hasnt changed since 2013:

https://www.openstreetmap.org/way/205424290/history

Flo
-- 
Florian Lohoff                                                 f at zz.de
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