Earthquake data on a flat map

For this example, we're going to plot earthquake data on a map. This visualization will have the following features:

1. A slider at the bottom can be used to select the year to be shown.
2. A dropdown at the top allows you to switch between projections.
3. A map in the center shows the projections and the earthquake data plotted on top.

An example using the Robinson projection looks like this:

This is a fairly standard projection, but D3 also comes with a number of more interesting projections. For instance, the InterruptedSinuMollweide projection renders the same information like this:

First, as we do for all the examples, we'll show you how to get the data.

Getting the data

For this example, we use two different data sources....