[GraphHopper] Question about traffic signals

[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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