[GraphHopper] Turn Restrictions

[Nick Bauer]

Ok, so I believe I have figured out the "correct" way to represent a turn
restriction in OSM so its considered by GH:

Seems to be that the most important part is that the ways are exact,
meaning that they are split at the via node.
Put another way, the via node must represent the end of the "from" way and
the same via node is also the end of the "to" way.
I couldn't find this documented anywhere, although sometimes I am blind to
certain things :)

The order of to, from, via is unimportant, as i have tested it with via as
the second, and last entries in the relation.


On Fri, Jun 12, 2015 at 9:12 AM, Nick Bauer <nick.j.bauer at gmail.com> wrote:

> Here is an example relation:
> [image: Inline image 1]
>
> My routing can turn in either direction, no restriction is upheld.
>
> On Fri, Jun 12, 2015 at 9:06 AM, dos65 <qtankle at gmail.com> wrote:
>
>>  Sorry, my mistake. Certainly members should contains via, from and to.
>>
>> While processing restrictions, gh look to restriction tag's value
>> prefix(no or only) and restrict or allow by from, via, to. There is no
>> difference between only_right_turn and only_left_turn if members are equals.
>>
>>
>>
>> On 12.06.2015 16:52, Nick Bauer wrote:
>>
>> I've read that the relation must have:
>> from, to, via.
>>
>>  Are you saying that it will work if the relation is only containing
>> from, to?  Is the ordering important?
>>
>>  Are there certain types of restrictions that work over others?  such as
>> no_left_turn vs only_right_turn?
>>
>>
>> On Fri, Jun 12, 2015 at 8:41 AM, dos65 <qtankle at gmail.com> wrote:
>>
>>>  Hi Nick.
>>> Restrictions must have members(from, to). In your case restriction don't
>>> have them and it does not processed by gh.
>>>
>>>
>>>
>>> On 12.06.2015 16:29, Nick Bauer wrote:
>>>
>>> Hi Peter-
>>>
>>>  Sorry for the delay.  Please see:
>>>
>>> https://graphhopper.com/maps/?point=41.616854%2C-88.122497&point=41.616365%2C-88.123473&locale=en-US&layer=Lyrk
>>>
>>>  OSM data has a turn restriction setup where you can only turn right,
>>> however GH shows a left turn.
>>> OSM data uses a single node with restriction:no_left_turn
>>>
>>>  Is this a sufficient relation?  What is required for GH to consider
>>> turn restrictions?
>>>
>>> On Thu, Jun 4, 2015 at 5:14 AM, Peter <graphhopper at gmx.de> wrote:
>>>
>>>>  Hi,
>>>>
>>>> > however I am not getting the results I expect.
>>>>
>>>>  what result do you expect? Please be more specific e.g. also include
>>>> some coordinates or screenshots and then describe the problem you have :)
>>>>
>>>> Regards,
>>>> Peter
>>>>
>>>>
>>>>
>>>> On 04.06.2015 02:02, Nick Bauer wrote:
>>>>
>>>>  Hello-
>>>>
>>>>  After reviewing the 0.4 list of changes, it seems to me that turn
>>>> restrictions are enabled.  I have what i believe is the correct OSM as well
>>>> as config.properties file, however I am not getting the results I expect.
>>>>
>>>>  I am mobile right now, so I can't post any detailed output, but here
>>>> is the config:
>>>>
>>>>  prepare.chWeighting=no
>>>> prepare.chShortcuts=no
>>>> osmreader.acceptWay=car
>>>> graph.flagEncoders=car
>>>>
>>>>  # Enable turn restrictions for car or motorcycle.
>>>> # Currently you need to additionally set prepare.chWeighting=no before
>>>> using this (see below and #270)
>>>> graph.flagEncoders=car|turnCosts=true
>>>>  graph.dataaccess=RAM_STORE
>>>>
>>>>  How does this config look?
>>>> My OSM has to from and via relation elements.  Any other tips on how to
>>>> correctly create the OSM?
>>>>
>>>>  Thanks,
>>>> Nick
>>>>
>>>>
>>>>  _______________________________________________
>>>> GraphHopper mailing listGraphHopper at openstreetmap.orghttps://lists.openstreetmap.org/listinfo/graphhopper
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> GraphHopper mailing list
>>>> GraphHopper at openstreetmap.org
>>>> https://lists.openstreetmap.org/listinfo/graphhopper
>>>>
>>>>
>>>
>>>
>>> _______________________________________________
>>> GraphHopper mailing listGraphHopper at openstreetmap.orghttps://lists.openstreetmap.org/listinfo/graphhopper
>>>
>>>
>>>   --
>>> Челышов Вадимqtankle at gmail.com
>>>
>>>
>>> _______________________________________________
>>> GraphHopper mailing list
>>> GraphHopper at openstreetmap.org
>>> https://lists.openstreetmap.org/listinfo/graphhopper
>>>
>>>
>>
>>
>> _______________________________________________
>> GraphHopper mailing listGraphHopper at openstreetmap.orghttps://lists.openstreetmap.org/listinfo/graphhopper
>>
>>
>> --
>> Челышов Вадимqtankle at gmail.com
>>
>>
>> _______________________________________________
>> GraphHopper mailing list
>> GraphHopper at openstreetmap.org
>> https://lists.openstreetmap.org/listinfo/graphhopper
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/graphhopper/attachments/20150612/a434327e/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 50816 bytes
Desc: not available
URL: <http://lists.openstreetmap.org/pipermail/graphhopper/attachments/20150612/a434327e/attachment.png>