Hello I'd like to create a simple topological map of a river system, ie all the waterways, where they join and points on them such as gauging stations so that it looks something like the London Tube map - where distances are not important but the relationships of the nodes are. I could probably Heath-Robinson something together but I wondered whether there was any kind of package already out there to save me reinventing the wheel. I've had a look but I can't find anything which seems to do this. Does anyone know whether there is already such a thing or is this an opportunity to create my first candidate R package? Thanks Nick Wray
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