[OSRM-talk] Getting OSMNodeIDs in OSRM

Patrick Niklaus patrick.niklaus at student.kit.edu
Mon Feb 1 17:18:22 UTC 2016

Hey Kerrick,

the data is not available in the server anymore, but you can load it
to memory if you like (which will increase the memory consumption
quite a bit on large datasets). The idea is to adapt this [1] function
to load a exteractor::ExternalMemoryNode vector to array that can
translate from NodeID (the index to that array) to the OSM id (the id
property of the struct).

[1] https://github.com/Project-OSRM/osrm-backend/blob/f5c12ec4330c0c835fc09dc349878e4fc670b861/include/util/graph_loader.hpp#L65-L105

Hope this helps!


On Mon, Feb 1, 2016 at 6:03 PM, Kerrick Staley <kstaley at lyft.com> wrote:
> I want to create a binary that will take an input lat/long and give the two
> OSMNodeIDs representing the nearest road segment. I was able to hack
> something together using NearestPhantomNodes in the OSRM codebase, but I
> can't figure out how to go from the NodeIDs in the PhantomNode to
> OSMNodeIDs.
> It looks like the NodeID -> OSMNodeID mapping is dropped in
> osrm-extract/osrm-prepare. Is this the case? Can I use the .osrm or
> .osrm.nodes file to re-build the mapping?
> Thanks,
> Kerrick
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