One in six of the US population live in 2% of its land area, and other things we learned from this mapping tool

Wow. Lot of people. Image: Sedac.

So here’s a cool thing doing the rounds on social media, as cool things are wont to do: a tool, courtesy of the Socioeconomic Data & Applications Center (Sedac), which estimates the population of any slice of the planet Earth you fancy drawing a line around.

Actually that’s not exactly right: technically, it allows you to estimate the population of any slice of the planet Earth back in 2005, which I note to my horror is a surprisingly long time ago now. But it is, nonetheless, a very cool tool, and allowed the Wall Street Journal’s Mike Bird to do this:

I haven’t actually checked Mike’s maths on this (that sounds like far too much work to me). But that snake seems to contain London, Birmingham, Nottinghma, Sheffield, Leeds, Manchester and Liverpool, plus their hinterlands and a chunk of territory between them, so it definitely seems plausible. Andwhen I did my own much lazier version I got this:

Back in 2005, the UK’s population was around 60m. If 35m lived in that wedge, then it seems entirely plausible that 30m lived in Mike’s snake. After all, nearly 47m lived in this circle:

That’s well under half the UK’s land area, containing over three-quarters of its population.

The Sedac tool isn’t restricted to the UK, of course. In European geography, there’s a wonderfully bizarrely-named concept called the “blue banana”: the sliver of territory running from northern England to southern Italy which is the most densely populated slice of the continent. It’s basically this bit:

Finding historic population figures for Europe is surprisingly difficult - in part, I suspect, because defining the boundaries of Europe is surprisingly difficult. But the whole of the EU had slightly under 495m people in 2005, so 188m is a pretty hefty chunk.

If you really want a megalopolis, though, try the Bos-Wash corridor in the north eastern United States:

That’s more than 1 in 6 of the US population, in around 2 per cent of its land area. (Yes, I know it looks like more than 2 per cent. It isn’t, I’ve checked. Blame the Mercator Projection.)

Just one more, for a giggle. In 2005, China had a population of around 1.3bn. More than 1bn of them lived in this area:


That’s about a quarter of the country, containing more than three quarters of its population.

Anyway, you get the idea. If you fancy wasting your afternoon drawing shapes on maps to see how many people live inside them, you can do so here.

UPDATE: The nice people who built the map have been in touch to point me to the most recent version, with data from 2015. So, there you go.

Jonn Elledge is the editor of CityMetric. He is on Twitter as @jonnelledge and on Facebook as JonnElledgeWrites

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These maps of petition signatories show which bits of the country are most enthusiastic about scrapping Brexit

The Scottish bit. Image: UK Parliament.

As anyone in the UK who has been near an internet connection today will no doubt know, there’s a petition on Parliament’s website doing the rounds. It rejects Theresa May’s claim – inevitably, and tediously, repeated again last night – that Brexit is the will of the people, and calls on the government to end the current crisis by revoking Article 50. At time of writing it’s had 1,068,554 signatures, but by the time you read this it will definitely have had quite a lot more.

It is depressingly unlikely to do what it sets out to do, of course: the Prime Minister is not in listening mode, and Leader of the House Andrea Leadsom has already been seen snarking that as soon as it gets 17.4m votes, the same number that voted Leave in 2016, the government will be sure to give it due care and attention.

So let’s not worry about whether or not the petition will be successful and instead look at some maps.

This one shows the proportion of voters in each constituency who have so far signed the petition: darker colours means higher percentages. The darkest constituencies tend to be smaller, because they’re urban areas with a higher population density. (As with all the maps in this piece, they come via Unboxed, who work with the Parliament petitions team.)

And it’s clear the petition is most popular in, well, exactly the sort of constituencies that voted for Remain three years ago: Cambridge (5.1 per cent), Bristol West (5.6 per cent), Brighton Pavilion (5.7 per cent) and so on. Hilariously, Jeremy Corbyn’s Islington North is also at 5.1 per cent, the highest in London, despite its MP clearly having remarkably little interest in revoking article 50.

By the same token, the sort of constituencies that aren’t signing this thing are – sit down, this may come as a shock – the sort of places that tended to vote Leave in 2016. Staying with the London area, the constituencies of the Essex fringe (Ilford South, Hornchurch & Upminster, Romford) are struggling to break 1 per cent, and some (Dagenham & Rainham) have yet to manage half that. You can see similar figures out west by Heathrow.

And you can see the same pattern in the rest of the country too: urban and university constituencies signing in droves, suburban and town ones not bothering. The only surprise here is that rural ones generally seem to be somewhere in between.

The blue bit means my mouse was hovering over that constituency when I did the screenshot, but I can’t be arsed to redo.

One odd exception to this pattern is the West Midlands, where even in the urban core nobody seems that bothered. No idea, frankly, but interesting, in its way:

Late last year another Brexit-based petition took off, this one in favour of No Deal. It’s still going, at time of writing, albeit only a third the size of the Revoke Article 50 one and growing much more slowly.

So how does that look on the map? Like this:

Unsurprisingly, it’s a bit of an inversion of the new one: No Deal is most popular in suburban and rural constituencies, while urban and university seats don’t much fancy it. You can see that most clearly by zooming in on London again:

Those outer east London constituencies in which people don’t want to revoke Article 50? They are, comparatively speaking, mad for No Deal Brexit.

The word “comparatively” is important here: far fewer people have signed the No Deal one, so even in those Brexit-y Essex fringe constituencies, the actual number of people signing it is pretty similar the number saying Revoke. But nonetheless, what these two maps suggest to me is that the new political geography revealed by the referendum is still largely with us.

In the 20 minutes it’s taken me to write this, the number of signatures on the Revoke Article 50 has risen to 1,088,822, by the way. Will of the people my arse.

Jonn Elledge is the editor of CityMetric. He is on Twitter as @jonnelledge and on Facebook as JonnElledgeWrites.

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