[OSRM-talk] Questions on EdgeBasedGraph and NBGToEBG mapping

[Stephane Clinchant]

Hi,

 First of all, OS-RM is quite new for me, so the following may sound
as naive questions.

 I'd  like to dump some of the OS-RM graphs produced by the extractor to
benchmark

some code in python.


I could extract the node coordinates, the (Compressed)
Node Based Graph and the EdgeBasedGraph
.  However, I am bit confused by the NBGtoEBG mapping and how to use it.



An Edge in the EdgeBased Graph has the form

[edge_source,edge_target,duration,weight]

To get the ids of the corresponding nodes, then I should look in the
NBGToEBG mapping


to find
those edge ids. If that ids is found in the forward field, then I take
the node source id,

 else the target node id. Is that correct ? or is there a step I missed ?



So I tried that to plot some edges on a map from the node coordinates.

However, I found some nodes that are unlikely to be connected:

 it looks like something is wrong in what I did.



My second question is: If ‘x’ is an edge of the edge based edge graph,

in what units is x.data.duration and   x.data.weight ?



Thanks a lot,

Stéphane
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