Tag Archives: maps

Mapping space and time

Earlier this afternoon, you arrived in an unfamiliar city. Now you want to get out and do some exploring. Where’s an art gallery? A bookstore? A coffee shop?

On a display board at a bus stop, you find a map of the city with points of interest marked. With a little effort you find an interesting-sounding gallery and see that it’s eight blocks west.

The map in front of you describes physical space. Wouldn’t it be nice if the map answered one more question: How long will it take me to get there?

You’re looking to take a trip, not just through space, but through space and time.

You need a time map. Peter Liu, whose company is called Mapbox, is working to design one for you.

As Peter points out, time maps aren’t new. He even found one from Melbourne, Australia, that was used a century ago. But today’s software creates lots of new possibilities.

Melbourne time map

Travel times from central Melbourne via rail, 1910-1922 (source: Peter Liu)

Check out Peter’s time maps for yourself. I especially like the one that changes based on whether you’re walking, riding a bicycle, or driving a car.

Maps are one of my favorite forms of technical communication. Maps have been around for so long, however, that it seems like we already know everything there is to know about making them.

That’s why the time map caught my attention: it’s a new way of looking at something old and familiar.

What do you think? Will we see more time maps in the future? Can they change the way we interact with the world around us?

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Tell your story, respect your reader

Look at these two maps. They’re based on the same data: population gain or loss by county. But they tell vastly different stories.

In the first map, the graphic artist started with the two extreme values in the data set (-6.3% and +28.7%) and divided the color scale into 5 equal pieces. As a result, all of the counties losing population are lumped together with counties that had no change or that posted slight gains.

usmap1

Source: Pew Charitable Trusts

The map tells us that a lot of counties lost population or held steady, several counties added population, and exactly two (one in the top middle and one near the bottom middle) added a lot of population. Frankly, it’s not much of a story.

Now look at what the Washington Post‘s Christopher Ingraham did with the same data. Ingraham changed the color scheme: blue counties gained population and red counties lost. The color intensity changes for counties that gained or lost more than 1% or 2%.

usmap2.png

Source: Christopher Ingraham, Washington Post

Now you can see a story. Continue reading