[openstreetmap-website] OSRM: Zoom level 14 causes loss of precision for very close-by locations (#1077)

[Tom Hughes]

It hasn't actually "routed through the playground" actually. The route, as described, is to follow "Die Liene" it's just that because that name continues around a right angled corner it regards it as a single segment and hence when it simplifies the graphical version of the route (as it does at lower z values) it treats that as a single segment in the graphical rendering.

So the real solution is that OSRM should realise that at a four way junction with three roads called "Die Liene" like that and a 90 degree turn that it really ought to treat that as a turn to be announced, which would also fix the rendering.

The solution for us is probably just to use a larger Z value - if that is supposed to be the zoom (what does the OSRM doco say?) then why are we always passing 14 there?

I don't see some attempt to refetch at higher Z as a sensible solution, especially as you still haven't managed to say what the criteria should be for making that decision...

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/1077#issuecomment-150906431
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