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I'm currently using the Road Graph plugin to find the shortest path in a road network - however, I'd like to put this to a processing script (to be used in a model later) and the Road Graph Plugin has no API to be used in a model.

Is there a way to put the shortest path algorithm to a processing script and then use this script in a model?

I found some python scripts for networks/shortest path in the Python Cookbook and tried to put it to a processing script - but as I am a complete newbie with python I didn't get far..

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The script should:

  • Take a roadnetwork (blue) and and a line vector layer (violet) as input
  • Put the start (green) - and endpoint (red) of the line as start and end of the path to be claculated
  • Use the intersections of the input line and the network as waypoints, that the path should follow
  • Find the shortest path (red ribbon) by routing through the network and save the path as vector layer

Can anybody help me with this script?

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You can find multiple versions of routing scripts which use the QGIS network analysis library in my Github repository, e.g. https://github.com/anitagraser/QGIS-Processing-tools/blob/master/2.2/scripts/point_layer_to_route.py which converts an ordered set of points into a route.

None of the scripts use the intersections of an input line with the network. That's something you will have to add on your own.

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