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I wish to extract from an OSM file a road network, and export it as an array (adjacency matrix) where the nodes are the road intersections and the edges represent the road segments.

I don't want to just visualise it, but also export the resulting adjacency matrix as a file with a network data structure in at least one of the following formats: numpy file (.npy), pajek file (.net), gephi file (.gexf), csv file (.csv). Alternatively, a list of nodes and edges with geometric info would do.

I seek a solution using either Python or QGIS.

I was hoping for something like this Matlab package, especially the 3rd item in the description. Unfortunately, I don't have Matlab installed on my machine.

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I do not know an exact solution, but will try to present you general ideas:

What you are looking for is adjacence matrix for an routing graph that is generated out of OSM geodata. While there is a huge interest in the routing topic at the community, there are just very few approaches to export the routing graph, as user usually want a full featured routing solution.

  • eWorld is a frontend for the SUMO engine that enables this simulator to make use of OSM. You can get network files etc.
  • osm2pgrouting fills a PostGIS DB according to the requirements of the pgrouting module
  • QGIS road graph plugin can also be used on OSM for example with the OSM import plugin or with preprocessed shapefiles
  • osm4routing might fit your export requirements, but I never heard of it before so I guess it's not in wide use...

A last idea would be to play with the trafficmining framework that seems to be very modular, so I guess you can get access to the processed data (but it's in JAVA)

All in all it depends on your use case.

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  • I will look into SUMO. What I have done so far is implement Vector > Analysis Tools > Line Intersections and export the attribute table as a shapefile with both latitude and longitude information. From there, I use Python (packages pyshp and networks) to extract and build the network.
    – EFL
    Commented Jan 20, 2014 at 8:43
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http://osm-traffic.com/ allows direct download of graph data from OpenStreetMap in json format.

Disclaimer: I work with the company who developed it, it might become a pay service.

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A systematic method has been developed for this according to NIH "A protocol to convert spatial polyline data to network formats and applications to world urban road networks"

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  • OP wants (pure?) Python or QGIS, and this discusses some ArcGIS tool the authors made for extracting routable networks from OSM. So only tangentially related to the question.
    – alphabetasoup
    Commented Oct 25, 2017 at 5:58

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