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So I have been capturing bus GPS locations for a while now, and I am became interested in snapping them to their corresponding polyline (route). While at first this seemed like an easy enough task I began to realise how complex this task is, particularly in situations where the route doubles back on itself and a simple snap to closest isn't always accurate.

Now I assume that I am not the first person in the world of GIS to want to do something like this, I was wondering if you have come across any algorithms, scripts, functions, programs or whatever that could help me with this task. I am currently using PostGIS and QGiS but am open to any suggestions.

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Mapbox has a plugin for mapbox.js to help snap and clean up GPS traces. https://github.com/mapbox/mapbox-match.js.

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