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 <[email protected]> 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. > > > _______________________________________________ > GraphHopper mailing > [email protected]https://lists.openstreetmap.org/listinfo/graphhopper > > > > _______________________________________________ > GraphHopper mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/graphhopper > >
_______________________________________________ GraphHopper mailing list [email protected] https://lists.openstreetmap.org/listinfo/graphhopper
