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I don't have any experience with this topic using QGIS, but I've tackled it before using LinkageMapper (free and open source!), which runs within Arc. You can learn about LM, along with a suite of related connectivity tools, at


This to me sounds similar to a water flow analysis on a DEM. That basically calculates the lowest surrounding point and draws the path of water. Maybe this type of approach would be a helpful place to start?


I believe that's because your Python is using ArcPy to call Geoprocessing tasks, which are running in 64-bit processes. ArcObjects happens in 32-bit processes.

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