[GraphHopper] Disconnected zero-degree nodes not being removed?

[me]

Thanks Peter, that's fixed the issue. 

Best regards, Phil


Sent from Samsung Mobile

-------- Original message --------
From: Peter <graphhopper at gmx.de> 
Date:  
To: graphhopper at openstreetmap.org 
Subject: Re: [GraphHopper] Disconnected zero-degree nodes not being removed? 
 
get the errors from the ghrespond object and see what is going wrong. probably it is due to disconnected area (route not found), then you can remove such area via e.g.
prepare.minOnewayNetworkSize=200

It should then snap to other roads like graphhopper maps does:
http://graphhopper.com/maps/?point=52.407995%2C-1.505722&point=52.410365%2C-1.49236

Regards,
Peter.

On 14.08.2014 18:29, me at pgwelch.info wrote:
Hi,

I've built a graphhopper graph for Great Britain following the instructions and calling ./graphhopper.sh web         europe_great-britain.osm from cygwin. The graph builds fine. However I'm finding when I try to create routes between 150 points in the UK then 2 of them - both mainland - don't route from. The rest route fine. Following the Graphopper code through for one of the points, I think its snapping to a node with no edges, which is why it won't route. I'm using the latest code.

When the graph was being built it output this information:
2014-08-14 16:36:30,849 [main] INFO routing.util.PrepareRoutingSubnetworks - optimize to remove subnetworks (49285), zero-degree-nodes (0), unvisited-dead-end-nodes(0), maxEdges/node (15)

Which I presume means it has removed any dodgy disconnected areas but didn't remove the zero-degree nodes I'm finding?

The following self-contained example tries to route but fails.

public static void noRouteExample(){
// this is the problem position
GHPoint a = new GHPoint(52.407995203838 ,-1.50572174886011);

// the second position can be anywhere....
GHPoint b = new GHPoint(52. ,-1.3); 

GraphHopper hopper = new GraphHopper().forDesktop();
hopper.setInMemory(true);
hopper.setGraphHopperLocation("C:\\Demo\\Graphhopper");
hopper.importOrLoad();

GHRequest req = new GHRequest(a,b);
GHResponse rsp = hopper.route(req);

System.out.println("Found = " + rsp.isFound());

}

I've uploaded the built graph to http://www.opendoorlogistics.com/wp-content/uploads/temp/europe_great-britain.zip

Any ideas where I'm going wrong? All help would be appreciated!

Many thanks

Phil

 

 


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