How could I generate a single transit map image , which is not based on any real map, on a massive scale? Are there algorithms or tools which could do something like this already?
Unlike conventional maps, transit maps are usually not geographically accurate—instead they use straight lines and fixed angles, and often illustrate a fixed distance between stations, compressing those in the outer area of the system and expanding those close to the center.
The scale I'm looking for is earth-like. If a line ran horizontally across it could have 40,075 stations kind of map. Ideally, It should also wrap around, like on a sphere.
I want it to look just like any local transit map (I'm basing myself on the Montreal metro map) which means I don't care about what a metro system of this scale should look like or how useless this would be.
So far, the research
Nathan Hellinga's Processing.py subway map generator resembles what I'm looking for and looks great but the algorithm wouldn't scale well to a very large grid.
Jannis Redmann's generating transit map theory is really interesting but bases itself on real world data. Maybe it could be used with generated data but how do you generate that data then?
Fractal generators! But how do I make it look like a transit map?
With Graphviz, I would still need an algorithm to generate data.
Slime is a really interesting idea! But how do you procedurally generate that?
My idea, a random walker. You all know what this is, I just don't think that's the best option there is.