Matt Bierbaum’s zombie map allows you to simulate outbreaks

When it comes to data visualisation, everyone loves a map. More exciting than a chart, easier than an infographic, it’s generally the first thing that journalists and journalism students alike ask: “How can we create a map?”

But just because you have some geographical data doesn’t mean you should map it.

Here’s why: maps, like all methods of visualisation, are designed for a purpose. They tell particular types of stories well – but not all of them.

There is also more than one type of map. You can map points, shapes, or routes. You can create heat maps and choropleth maps.

I’ll tackle those different types of maps first – and then the sorts of stories you might tell with each. But the key rule running throughout is this: make sure you are clear what story you are trying to tell, or the story that users will try to find. The test is whether a map does that job best. Continue reading →