[GraphHopper] Question about traffic signals

[Jan Soelter]

Hi,

i'm not sure if i really understand what you want.
But maybe it helps if you take a look atOSMreader.processWay, where
barrier nodes are converted to towernodes?
I for my part would use this method, which assigns OSMnodes to
GraphHopper edges anyhow, and directly covert the nodeflags directly to
edgeflags.

Cheers,
Jan

Am 02.03.2015 um 21:32 schrieb 高安琪:
> Hi all,
>
> Thanks very much for your helps. :p
>
> I am working on importing traffic lights nodes as tower nodes.
>
> However, I am not familiar with GraphHopper and get stuck in it. I have
> already encoded traffic lights into nodeflag. The problem is I don't know
> where I can add nodeflags into tower nodes. No ideas with how to handle it.
> :(
>
> Could you please provide some details on how to do it?
>
> Thx verrrry much~ :p
>
> Regards,
> Anqi
>
> 2015-02-27 20:34 GMT+00:00 Peter <graphhopper at gmx.de>:
>
>>  Yes, good idea. Then you'll have a bit more nodes but an easier handling
>>
>> Regards,
>> Peter
>>
>> On 27.02.2015 21:29, dos65 wrote:
>>
>> Perhaps it may be easier to import traffic lights nodes as tower nodes?
>>
>> On 27.02.2015 22:54, Peter wrote:
>>
>> Hi,
>>
>> this is possible but kind of tricky with the current import procedure.
>> You'll have to determine which OSM nodes belond to which GH node (keep in
>> mind that for certain situations, especially for car, one OSM node could
>> also be on an GH edge). So you will need to store a traffic signal counter
>> per edge and put it e.g. into the flags. Please read also through:
>> https://github.com/graphhopper/graphhopper/issues/75
>>
>> Regards,
>> Peter
>>
>> On 27.02.2015 20:24, 高安琪 wrote:
>>
>>  Hi,
>>
>>  I am a student majored in computer science from University of
>> Nottingham. There is a group project for my second year module. We are
>> working on adding new features to Graphhopper.
>>
>>  We try to show the number of traffic signals to user on Graphhopper.
>>
>>  We get the number of traffic signals by using node.hasTag(). Then store
>> it in OSMWay.
>>
>>  We show the number of traffic signals for specific way on the front-end.
>> (we do it in the same way as showing road name of specific way)
>>
>>  The problem is that user may pass through a part of road(OSMWay), not
>> entire road(OSMWay) and it shows the total traffic signals on this roads
>> which is useless for user.
>>
>>  E.g. There are 2 traffic signals on Ilkeston Road, user will encounter
>> one of them. We do it in the way mentioned above and it just shows the
>> total traffic signals instead of the exact number of traffic signals user
>> may encounter.
>>
>>  [image: 内嵌图片 1]
>>
>>  May I ask is it possible for us to show exact number of traffic signals
>> user may encounter. If we could do it, may I ask for some suggestions about
>> how to implement it?
>>
>>  Regards,
>> Anqi
>>
>>
>>
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>
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