[GraphHopper] Data graph

[Peter]

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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