Tuesday, July 29, 2014

Brazil as seen from the ISS

"Early morning of June 12 2014, one of the Expedition 40 crew members aboard the International Space Station (ISS) took this picture of Brazil ... Sao Paulo is the large cluster of night lights near the coast on the right side of the frame. Rio de Janeiro is the coastal city to the left of Sao Paulo. Belo Horizonte is the cluster of lights near frame center." 

An amazing picture by Reid Wiseman (via Demografía - CSIC).

[click on the image to enlarge it]

Related Links:

Monday, July 28, 2014

Journeys to Work in the UK

James Cheshire and Oliver O’Brien alert us that the UK Office for National Statistics (ONS) have released the Travel to Work Flows based on the 2011 census. James and Oliver have also developed a nice interactive map you can "play" with: Commute.DataShineRob Fry also calls attention to another great interactive visualization here, by ONS.

[image credit: James Cheshire and Oliver O’Brien]

Thursday, July 24, 2014

Are speed cameras Effective?

 kind of off-topic 

If this paper cannot convince you that speed cameras are effective in reducing road traffic collisions, you should watch this video. It gets really good at 1:12.

Population distribution in European capitals

The map shows a fine-scale spatial population distribution in selected European capitals. The high resolution map is here, and it comes from this paper:

Batista e Silva, F., Gallego, J., Lavalle C. (2013). A high-resolution population grid map for Europe. Journal of Maps 9(1):16-28.

Population figures are usually collected by national statistical institutes at small enumeration units (e.g. census tracts or building units). However, still for many countries in Europe, data are distributed at coarser geographical units like municipalities. This level of resolution is insufficient for analysis in many fields. In addition, the heterogeneity of the size of the geographical units causes great distortions in analysis, i.e. the Modifiable Areal Unit Problem (MAUP). Dasymetric mapping techniques have long been applied world-wide to derive finer (and MAUP-free) depictions of the population distribution. These techniques disaggregate population figures reported at coarse source zones into a finer set of zones using ancillary geographical data. ... In this article, we test new geographical datasets to produce an updated and improved European population grid map. ... As final outcome of this cartographic exercise, a European population grid map for the reference year of 2006, with a spatial resolution of 100 × 100 meters, is presented and validated against reference data. Resident population reported at commune level, a refined version of CLC and information on the soil sealing degree are used as the main inputs to produce the final map.

Related Paper and data:

Sunday, July 20, 2014

Winter Course on Advanced Studies in Demography at MPIDR

The Max Planck Institute for Demographic Research (MPIDR) is receiving applications for the upcoming International Advanced Studies in Demography (IDEM) program, next winter semester 2014/15 in Rostock (Germany).

The program includes courses on Agent-based Modeling and Simulation, Integral Projection Models, Bayesian Forecasting, Spatial Demography, and other topics. Highly recommended! Thanks Rob Salguero-Gomez for the tip.