[OSRM-talk] Use OSRM on rivers, railways, power lines

[Daniel Patterson]

Hi François,

  Currently, OSRM doesn't know anything about route relations (although
some work has started on it here:
https://github.com/Project-OSRM/osrm-backend/pull/4438).

  For now, you'd need to convert them to separate ways, or copy the
relation tags onto the relevant ways so that the `process_way` Lua function
will be able to see the tags.  Flattening relations like this can be
complicated, I don't know if there's an easy-to-use tool that can already
do it.

daniel

On Sun, Aug 27, 2017 at 10:59 PM, François Lacombe <
fl.infosreseaux at gmail.com> wrote:

> Hi Daniel,
>
> This is indeed an interesting point.
>
> In substations, every incoming line is often connected to busbars, which
> allow to switch power from lines to another.
> They are supposed to be in OSM when outdoor and visible on aerial imagery
> like this one : http://www.openstreetmap.org/way/170169821
>
> Then I'd better to propagate substation attributes on its busbars and then
> define them as is_starting=true
> If I don't find them in OSM data, it's pretty easy to create a virtual one
> by linking every incoming line end point.
>
>
> Once the is_starting problem solved, can osrm understand directly route
> relation like the one given in my first mail :
> http://www.openstreetmap.org/relation/6694740
> Or should I convert them in separate ways before building osrm network ?
>
>
> All the best
>
> François
>
>
> *François Lacombe*
>
> fl dot infosreseaux At gmail dot com
> www.infos-reseaux.com
> @InfosReseaux <http://www.twitter.com/InfosReseaux>
>
> 2017-08-25 18:04 GMT+02:00 Daniel Patterson <daniel at mapbox.com>:
>
>> Hi François,
>>
>>   The only problem I can see is that OSRM only snaps to *edges*, not
>> nodes, and the `is_startpoint` property is only available for ways, not
>> nodes.
>>
>>   If you insert new artificial ways that connect the centroid to each
>> line and have different tags and can be marked as `is_startpoint=true`,
>> then it will work fine.  If you simply extend the powerlines by adding an
>> additional noderef to the powerline ways, then you'll still have the
>> nothing-to-snap-to problem.
>>
>> daniel
>>
>> On Thu, Aug 24, 2017 at 11:58 PM, François Lacombe <
>> fl.infosreseaux at gmail.com> wrote:
>>
>>> Hi Daniel,
>>>
>>> Ok,
>>>
>>> Or I can take the centroid of each substation area and connect each line
>>> to it.
>>> Then, drop the area and only keep substations nodes which get the
>>> is_startpoint in the profile.
>>>
>>> On render side, I will surely be able to match substation nodes given by
>>> osrm and actual areas with ref tags.
>>>
>>> I'll be testing it for some times and will share it if interested
>>> Thank you for your time
>>>
>>>
>>> All the best
>>>
>>>
>>> 2017-08-25 0:04 GMT+02:00 Daniel Patterson <daniel at mapbox.com>:
>>>
>>>> Yes, connectivity will be a problem in that example.  If you make the
>>>> lines `is_startpoint=false` and they're not connected to something else,
>>>> then you won't be able to route over them.
>>>>
>>>> You will need to do some pre-processing here - create artificial nodes
>>>> at the points where the substation boundaries cross the lines and connect
>>>> both ways to those artificial nodes.
>>>>
>>>> daniel
>>>>
>>>> On Thu, Aug 24, 2017 at 2:33 PM, François Lacombe <
>>>> fl.infosreseaux at gmail.com> wrote:
>>>>
>>>>>
>>>>> 2017-08-24 23:18 GMT+02:00 Daniel Patterson <daniel at mapbox.com>:
>>>>>
>>>>>> Franccois,
>>>>>>
>>>>>>   In the lua profiles, you can set the `result.is_startpoint`
>>>>>> property in `process_way` (used to be `way_function`) to determine whether
>>>>>> you can snap to them.  We currently use this for ferry routes - paths can
>>>>>> use them, but can't start/end on them.
>>>>>>
>>>>>>   Set `is_startpoint` to true for your substations way areas, and
>>>>>> `is_startpoint` to false for the transmission lines.
>>>>>>
>>>>>
>>>>> That's exactly what I need, thank you
>>>>>
>>>>>
>>>>>>   The route will start by following the outside edge of the
>>>>>> substations area polygon, but it sounds like that doesn't matter too much
>>>>>> to you.
>>>>>>
>>>>>
>>>>> It doesn't matter indeed.
>>>>> But it may be an issue that power lines aren't actually connected to
>>>>> substation perimeter ?
>>>>>
>>>>> Like this one : https://www.openstreetmap.org/way/100500802
>>>>> The outside edge of the substation is the fence surrounding it and
>>>>> power lines goes above it without connection.
>>>>>
>>>>> Should I preprocess my data to make it more accessible to osrm or
>>>>> there's other way ?
>>>>>
>>>>> Francois
>>>>>
>>>>>
>>>>> _______________________________________________
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>>>>>
>>>>>
>>>>
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