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

[Daniel Patterson]

As usual with OSRM, things are more complicated than that :-)

Calls to `/viaroute` use this logic for tiny components:

https://github.com/Project-OSRM/osrm-backend/blob/develop/plugins/viaroute.hpp#L125-L155

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

Anyway, long story short, calls to `/viaroute` will attempt to select common connected networks for potential viapoint snapping, the `z=` parameter doesn't affect it at all.  There is no reason for `osm.org` to stick to `z=14` any more, except for the bandwidth savings achieved by line simplification that adding a `z=` parameter triggers.

The `/locate` plugin still uses the method that @systemed referred to, but `/viaroute` does not.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/1077#issuecomment-151210712
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