May 1st, 2014 - Carson Farmer
Mouseover to focus on rides to or from a single neighborhood.
The thickness of links between neighborhoods encodes the relative frequency of rides between two neighborhoods: thicker links represent more frequent rides. Only flows that represent more than 1000 trips are represented here to avoid too many small flows.
Links are directed, and are colored by the more frequent origin (i.e., where most of the trips originate from). Colors themselves are pretty much arbitrary.
You can move the slider around to change which year/month is shown. Play around by sliding around and comparing flows over different time periods. Also watch for chord 'flipping', where the dominant flow direction changes from month to month. This is particularly common in the smaller flows, where there isn't a strong dominant direction.
Built with [d3.js](http://d3js.org/) and based very heavily on [this](http://bost.ocks.org/mike/uberdata), [this](http://exposedata.com/tutorial/chord/latest.html), and [this](http://fleetinbeing.net/d3e/chord.html). This quick visualization was first attempted at the April 2014 [#BetaNYC](http://www.meetup.com/betanyc/) (#BikeNYC) [@CitiBikeNYC](https://twitter.com/CitibikeNYC) Hacknight, this (final?) version is what I ended up settling on.
Data sources: CitiBike System Data and Pediacities NYC Neighborhoods.