[GraphHopper] Shortest route failed (ferry issue?)

[Martin Sauvage]

Hello Peter,

I'm pretty sure there is a problem with this specific ferry link (named
"Bac Indret") even with the latest version of GH. I tried on other ferry
link and GH works fine.

If you test this:
https://graphhopper.com/maps/?point=47.19415%2C-1.676384&point=47.19747%2C-1.671832&locale=fr-FR&layer=Lyrk

You will see only bikes take the ferry while foot and car do not use it.

OSM tags for this ferry seem to be fine (use duration and opening hour tags
also)

In addition, using directions thru OSM web site, MapQuest or OSRM provides
correct route while GH meets some issue (route is not found)

http://www.openstreetmap.org/directions?engine=mapquest_foot&route=47.19498%2C-1.67554%3B47.19774%2C-1.67202

Regards,
Martin






2015-07-13 10:32 GMT+02:00 Peter <graphhopper at gmx.de>:

> Hi Martin,
>
> hmmh, if the speed is somehow calculated to be 0 then the access should be
> set to false making the ferry no longer available. And if the speed is not
> 0 then the exception should not be thrown.
>
> Additionally in this case I see that the unknownSpeed *should* be selected
> but it should be 5km/h (living_street):
>
> https://github.com/graphhopper/graphhopper/blob/master/core/src/main/java/com/graphhopper/routing/util/AbstractFlagEncoder.java#L512
>
>
> https://github.com/graphhopper/graphhopper/blob/master/core/src/main/java/com/graphhopper/routing/util/CarFlagEncoder.java#L283
>
> Maybe you can debug this a bit and tell if the speed of the edge is 0 or
> not and why.
>
> Also when switching branches make sure you remove the target folders
> and/or rebuild in your IDE.
>
> Regards,
> Peter
>
>
> On 10.07.2015 18:35, Martin Sauvage wrote:
>
> Hi,
>
> I tried on master and I still got the same illegal state exception, so
> apparently ZhiQiang fix doesn't solve the problem (is it a ferry link
> only issue?).
> Any idea?
>
> Thanks,
> Martin
>
>
>
> 2015-07-10 10:50 GMT+02:00 Peter <graphhopper at gmx.de>:
>
>> Hi Martin, Hi ZhiQiang,
>>
>> this could be related to the bug ZhiQiang mentioned but this was already
>> fixed:
>> https://github.com/graphhopper/graphhopper/issues/367
>>
>> This can only occur for shortest path routing:
>> https://github.com/graphhopper/graphhopper/issues/242
>>
>> Martin, do you use master or a 0.4 branch?
>>
>> Regards,
>> Peter
>>
>> On 09.07.2015 19:46, John Zhao wrote:
>>
>> Hi Martin,
>>
>> I have face the same problem.
>> At last I found it caused by maxspeed=3 in the osm data.
>> carFlagEncoder use 5 as factor of speed encoding.
>> every number below 5 will be convert to 0.
>>
>> Then you will have some edges in the graph with speed=0.
>>
>> *Best Regards,*
>> *ZhiQiang ZHAO*
>>
>> On Thu, Jul 9, 2015 at 5:20 AM, Martin Sauvage <martin.sauvage at gmail.com>
>> wrote:
>>
>>> Hello,
>>>
>>> I'm facing an issue when routing with shortest path between these 2 GPS
>>> points:
>>> 47.194150,-1.676384
>>> 47.197470,-1.671832
>>>
>>> Caused by: java.lang.IllegalStateException: Speed cannot be 0 for
>>> unblocked edge, use access properties to mark edge blocked! Should only
>>> occur for shortest path calculation. See #242.
>>>
>>> I suspect the shortest route tries to take the ferry (Bac Indret) with
>>> no defined speed while the fastest route provides:
>>>
>>> https://graphhopper.com/maps/?point=47.19415%2C-1.676384&point=47.19747%2C-1.671832&locale=fr-FR&layer=Lyrk
>>>
>>> Is it a GH bug or an OSM data issue? Is there any way to fix this crash
>>> (do not take ferry with shortest route) ?
>>>
>>> Thanks,
>>> Martin
>>>
>>>
>>
>
> _______________________________________________
> 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/20150816/17b1f8e3/attachment.html>