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I'm looking for a way in which to generate a set of routes between every point in a layer.

To be clear, if I have four points [A,B,C,D] I want to get routes:

  • A - B
  • A - C
  • A - D
  • B - A
  • B - C
  • ...

... and so on for a total of (4*3=) 12 routes in this example; in fact, I have 35 points in my dataset so it's a bit more than that!

I can't ascertain a way to do this programmatically in QGIS using the Road Graph function or the OSM Route plugin (although it does give good results for a single route), and web searches have turned up nothing (most answers relate to routes that follow a number of points).

Preferably, as this is for cycling purposes, I'd like to use a routing service that would take the method of travel in to account, but not strictly necessary as I'd be happy just to use my line vector layer that I have for the area containing my points.

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  • Why can't you generate the route as you need it? Is it imperative to store every possible combination and direction? There was a similar question to this about a week ago... that one received no response. I would suggest to iterate through your points, create a single route, store it (somehow) and then create a new single route if you must have all the routes solved and ready. Do you have any python ability? How are the solved routes to be consumed?
    – Michael Stimson
    Commented May 24, 2016 at 22:11
  • Yes, I do need all pf the routes at once as this forms part of network analysis. I do have python ability, though I've never used it in qgis before. The solved routes are to be consumed within qgis to create a heatmap.
    – jmk
    Commented May 25, 2016 at 7:11

1 Answer 1

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You could use pgr_dijkstraCost from PGRouting in many-to-many mode.

Then you could run something like:

SELECT * FROM pgr_dijkstraCost(
    'select id, source, target, cost, reverse_cost from edge_table',
    ARRAY[1,2,3,4,5],
    ARRAY[1,2,3,4,5]);

Where the arrays are the ids of you start/finish nodes.

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