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

[Richard Fairhurst]

Aha, that's good.

> That logic was added in Dec 2014, so it might be newer than osm.org's decision to use Z14.

Indeed - the initial PR for routing on osm.org was in March 2014: https://github.com/openstreetmap/openstreetmap-website/pull/716 .

Thinking it through today, I'm still sceptical about rerequesting whenever the user zooms/pans, but I wonder if osm.org should perhaps select zoom level based on great-circle distance between start and end points: z14 is probably a reasonable default for a trans-America route, z18 is probably good for home-to-shops. A compromise, yes, but perhaps a reasonable one.

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https://github.com/openstreetmap/openstreetmap-website/issues/1077#issuecomment-151212118
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