[GraphHopper] Data graph

[Alexander Tkachov]

And what is the size of such graph?
I mean, if there opportunity to download some peace of the graph? It will
improve processing time (because the graph will be in memory) and reduce
your server workload.

Thanks a lot for the information.

On Wed, Jun 24, 2015 at 11:44 AM, Peter <graphhopper at gmx.de> wrote:

>  Hi Alexander,
>
> first, you should get yourself familiar on e.g. how a simple route
> <https://github.com/graphhopper/graphhopper/blob/master/docs/core/routing.md>
> can be calculated with the default algorithms from GraphHopper.
>
> Then for your new algorithm you can use the low level API
> <https://github.com/graphhopper/graphhopper/blob/master/docs/core/low-level-api.md>
> where you have direct access to the Graph object:
> Graph graph = graphHopper.getGraph();
>
> Read a bit about tower vs. pillar nodes, and try to traverse the graph its
> 'junctions' and implement the algorithm for it. As an example you can have
> a look into Dijkstra.java
> <https://github.com/graphhopper/graphhopper/blob/master/core/src/main/java/com/graphhopper/routing/Dijkstra.java>
> .
>
> Also read about custom weighting
> <https://github.com/graphhopper/graphhopper/blob/master/docs/core/weighting.md>
> and flag encoders
> <https://github.com/graphhopper/graphhopper/blob/master/docs/core/create-new-flagencoder.md>
> .
>
> Kind Regards,
> Peter
>
>
> On 24.06.2015 11:31, Alexander Tkachov wrote:
>
> Hi.
> I have a problem. I want to implement my own search algorithm (the
> shortest path between two points on map for cars). For these purposes I
> need some kind of graph (or something else). If there opportunity to get
> crossroads graph? I mean, I need something, which contains crossroads where
> each crossroads contains coordinates, the list of nearest crossroads and
> distances (m or km) to these nearest crossroads. If there will be any other
> parameters (like speed limits etc) it will be great.
> How can I get such kind of data if on the beginning I have only
> coordinates of start and end points.
>
>  Thanks.
>
>
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