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.

Abstract:
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.

Wednesday, July 16, 2014

Old and New Isochrone Maps

Apparently, this is one of the oldest isochrone maps, circa 1920. It shows the “minimum” travel time into the city of Melbourne via suburban railways and tram lines (via Daniel Bowen and Transit Maps).

 Transit Maps also points out to this isochrone map of Manchester in 1914.  Finally, the Atlas of the Historical Geography of the US of 1932 showed also published a few isochrone maps of American railways in the 1800s. These maps comprise only a small sample of our old obsession with time.

Train and Tram Travel Times in Melbourne, Australia, c. 1920



More recently, some people/projects have been applying new technologies to this old obsession with travel times, and the results include some pretty amazing maps. Among many of these new projects, I would highlight two:  The great Mapnificent (by Stefan Wehrmeyer).



Ant the amazing work Xiaoji Chen and her maps of Singapore and the isogreenic (!) map of Paris


Related Links