This is part of a set of visualisation that try to improve the Barclay's bike distribution in London. Visualizing the map of the London Tube is the first step to understand any correlation with bikes usage.
The technical aim I tried to achieve, is a very simple codebase that enables interaction (such as zooming) for later data analysis.
I have been using RandomETC's idea. However, in order to support scaling and to have a more structured code-base, most of the code has been re-written.