[GraphHopper] Shortest route failed (ferry issue?)

[Peter]

Hi Martin,

thanks again for the report, really important to get this fixed! I've
created an issue as something seems wrong:
https://github.com/graphhopper/graphhopper/issues/501

Let us move the discussion there.

Regards,
Peter

On 16.08.2015 16:18, Martin Sauvage wrote:
> 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
> <mailto: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
>>     <mailto: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 <mailto: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
>>>
>>
>

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