Wednesday, May 24, 2017

Urban Picture

Sunday, May 21, 2017

The impressive expansion of subway systems in China

I have posted in the past a GIF that compares the expansion of the subway systems of Rio and Shanghai between 1979 and 2014. This is a bit embarrassing for Rio, for sure, but let's be honest. Pretty much any developing county and even the USA in their efforts to develop mass transport infrastructure pales in comparison to China. Needless to say that massive expansion of infrastructure like this usually comes at high social and environmental costs that should not be neglected.

Peter Dovak (twitter) has created a new GIF that shows the expansion of subway systems in China between 1990 and 2020, giving a glimpse of the Chinese urban powerhouse. Peter has other great projects you might want to check out, including the Mini Metro Maps of the world.

ps. I saw this on the Transportation Planning and Analysis Facebook group, via Gonçalo Correia

Saturday, May 13, 2017

Time-lapse: night-flight over Europe

Great shot, by Thomas Pesquet.

Wednesday, May 10, 2017

Message of the Day

Dedicated to a dear friend, Claudia Comberti. From London to the Amazon forest.

Friday, May 5, 2017

Changing relation between wealth and left-wing vote: Piketty's guess on the French elections

I don't usually post about politics in the blog, but I had the chance to attend Thomas Piketty's presentation at the Marshall Lectures over the last two days and he dedicated a few minutes of his speech to talk about the 2017 French elections happening this weekend. 

He presented these two slides, where he shows the changing relationship between wealth + education and left-wing vote in France. The slides show what is Piketty's guess on what is going to happen in the French elections.  Hi guess are the red lines in both charts, suggesting that Macron will win the election. I think I'll just leave this here, for the record.

update after the elections: so, apparently, Piketty was correct.

photos: by Rafael H M Pereira

Thursday, May 4, 2017

Urban Picture

Street Chalking Games, New York city 1950

credit: ?, via MicropolisNYC

Wednesday, April 26, 2017

Map of Population Density Lines in R

If you are familiar with this famous Joy Division cover, you might remember that last year we shared a link that shows you how to reproduce the cover using R ggplot2. If you are a big fan of Joy Division and R, you should know that there is an R package just for that (by @mikefc).

About three years ago in 2014, James Cheshire created the Population Lines Print, a stylized map using lines to show population density in the world. It uses roughly the same data visualization style used in the Joy Division cover. 

credit: James Cheshire

How can you create a nice-looking map like this? Ask no more. James has recently shared the R script and a bit of the history behind his mapHenrik Lindberg has also generously written a gist with a simple and reproducible code to create a map with the same style showing the distribution of the population density in Europe, using R and ggplot2.

and you get this:

credit: Henrik Lindberg

UPDATE: Carson Sievert‏ shows how you can add two (2!) more lines of code to make this map interactive.

Tuesday, April 25, 2017

An unorthodox approach to spatial clustering

I left a question on gis.stackexchange about an unorthodox approach to spatial clustering that came to my mind a couple of days ago. I would be glad to hear if you have any thoughts on this. If you have any comments/answers, this time I'll ask you to write them on the gis.stackexchange website.