[talk-au] Routing through a park that doesn't have actual paths

Jonathon Rossi jono at jonorossi.com
Wed Jan 31 14:45:53 UTC 2018


It appears that this is a long standing enhancement request for GraphHopper:
https://github.com/graphhopper/graphhopper/issues/82

On Thu, Feb 1, 2018 at 12:17 AM Jonathon Rossi <jono at jonorossi.com> wrote:

> To clarify, both Google Maps and Strava routing can't do this either, I
> was trying to work out if OSM could do this.
>
> On Thu, Feb 1, 2018 at 12:10 AM Jonathon Rossi <jono at jonorossi.com> wrote:
>
>> In the past I've mapped exactly what I've surveyed on the ground in local
>> parks, however I've recently been using the OSM routing feature rather than
>> from other services and I've discovered it can't route directly across a
>> park that is just grass.
>>
>> In the following example, I've mapped:
>> - the short grass track (eastern side) that council are likely
>> inadvertently making each time they bring vehicles through the gate to mow
>> the park (the rest of the park boundary has timber bollards),
>> - trails that lead from the Greater Glider Conservation Area out into the
>> park, the small bit of the "Trail Circuit" in the park isn't actually a
>> well defined path it just opens up but it isn't grass and the amount of
>> trees keep it path like
>> - other well formed paths that lead out to roads
>>
>>
>> https://www.openstreetmap.org/directions?engine=graphhopper_foot&route=-27.54259%2C153.22173%3B-27.54227%2C153.21904#map=18/-27.54200/153.22056
>>
>> The OSM Wiki states:
>>
>> > Ways (highway=path or highway=footway) leading into a park from a road,
>> should always be connected to the road for routing purposes. It's debatable
>> whether they should connect to the park area with a shared node, or cross
>> over the polygon without connecting. TODO discuss
>> > (https://wiki.openstreetmap.org/wiki/Tag:leisure=park)
>>
>> If a park is just a big grass area (with maybe a few obstacles like a
>> playground) then it feels like the responsibility of the routing engine to
>> just do this (maybe with an access tag to say it is okay to do so). It
>> feels wrong for us mappers to map a "grass" path through the park from each
>> entrance that we feel is a main thoroughfare.
>>
>> Am I missing something, have others "fixed" this problem elsewhere?
>>
>> Jono
>>
>
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