[OSRM-talk] Snapping preferences

[Daniel Patterson]

Hi François,

  Currently, no - snapping for coordinates is strictly whichever is nearest
(with one exception:
https://blog.mapbox.com/robust-navigation-with-smart-nearest-neighbor-search-dbc1f6218be8
).

  I can think of two things:

    1.  Try using the `/match` API.  This API snaps to *many* nearest
points (usually within 15m), and tries routes between all combinations, and
returns the most likely.  As long as your coordinates are reasonably close
(<2km), it should be almost usable as a replacement for the `/route` API.

    2.  You can use the `/nearest` API to return more than one possible
snap point within range, then pick one, then request `/route` with the
snapped coordinates you have chosen.  This is only viable if `/nearest`
returns enough information for you to decide which snapping point is best.

daniel


On Fri, May 4, 2018 at 8:37 AM, François Lacombe <fl.infosreseaux at gmail.com>
wrote:

> Hi all,
>
> I'm wondering if osrm can weight its snapping choices for start location ?
> Especially for footwalk mode.
>
> There are situations where farer ways can lead to shorter routes.
> Currently osrm always snap start location to nearest way but doesn't give
> me the shortest route according to my knowledge.
>
> Is there any trick in the profile to make some ways preferable to snap to?
> Should I open an issue regarding this?
>
> All the best
>
> *François Lacombe*
>
> fl dot infosreseaux At gmail dot com
> www.infos-reseaux.com
> @InfosReseaux <http://www.twitter.com/InfosReseaux>
>
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