Last week the German weekly newspaper ‘Die Zeit‘ published an article on the distribution of physicians in major German cities. They used maps to show the relationship between income and physician density. Their main claim was that physicians tend to open their offices in wealthier districts.
First of all – we love the style and user interface of the article. It is really well done and the Zeit’s new customized mapbox style blends in really neat into their overall design. However we believe that the Zeit could have done better in one respect: They did not discuss the significance of the correlation between income and physicians density.
Yes, it is! The diagram with it’s trend line show that there in deed is a strong correlation between income and the density of physicians. Another determinant is visualized by the colors: the population density. Even though we’ve already normalized the number of physicians per capita, those districts with a higher population density still tend to have a higher density of physician’s offices. In our eyes this is the case, because those districts in general are closer to the city center and are characterized by mixed-use.
How was this done?
We had a deeper look at the Zeit website and found a JSON-file containing the information behind their interactive explorer. We extracted the locations of the physicians and joined them to a district shape with QGIS. Afterwards we used public data from the Statistikamt Nord to add income statistics. Finally, the scatterplot was realized tableau-public.
The projects we’ve published so far are all visualizations and analyses of human activity, mostly on a city scale. But there are so many more fascinating data sets out there and it’s about time for us to broaden our activities. Therefore, it was a welcome opportunity to do some mapping together with Julia Griehl (@JulieDeLaMer) who is writing her master thesis on the protection of terrestrial mammal species. As a sneak preview into her work – she’s currently adding the finishing touches to her thesis – we want to share this map on mammal distribution with you:
Plain and simple, the map shows the distribution areas of almost all terrestrial mammals – more than 5,000 species in total. The distribution data was obtained from the IUCN Red List of Threatened Species (which in fact lists all known mammals, classified into different categories spanning from low concern to a high risk of extinction). The map we present here is part of Julia’s data source description. We’ve simply mapped all distribution areas on top of each other with a very low opacity (2%) using QGIS. Areas of full saturation consequently have a density of more than 50 species. Only hitch was the enormous data size and processing time (e.g. to exclude extinct species and delete marine distribution areas of some terrestrial mammals, such as seals, by clipping along coastlines using Natural Earth data).
Even tough the map is rather simple and descriptive we still like it for it’s unique style. It ratherhas the appearance of a precipitation map than a biodiversity map.
As a little extra, we’ve calculated statistics per latitude and visualized them as bar charts with Adobe Illustrator’s graph functionality. The bars visualize the size of land area (left axis) and the number of species (right axis). It’s quite easy to spot that the highest diversity of terrestrial mammals can be found in the equatorial belt – areas with tropical climate – whereas the peak values for landmass are between 25° – 50° N.
But enough text and time for some visuals. You can explore the map in a full-sized zoomable view when you click the world map image above. It’s fun to zoom in and see how diversity is changing rapidly – for example between the the Gangetic Plain, Nepal and the Himalayas. Or how the mountain range of ‘Tassili n’Ajjer’ stands out in the middle of the Sahara Dessert.
Ulla Jelpke, Jan van Aken and Christine Buchholz (German MPs – die Linke), today published a document about public recruiting events of the German army. Events like this, especially if targeted on school children and teenagers, have been the subject of fierce public discussions for quite some time.
We filtered the given information to show the location of the people attending the events and not the venue. A first look at the map shows a slight accumulation of events in rural regions (possibly related to higher unemployment rates). It would be interesting to correlate the data with other sources.
We extracted the tables from the pdf file using tabula, a helpful little tool, which lets you convert pdfs directly on your computer (great for sensitive data). The next step was to clear and categorize the data, geocode it and upload it to cartodb.
The aim of this blog post is not to show you the best possible map design but to point out that with today’s tools everything is mappable – even on a very short notice: The whole process took us about 1,5 hours (so there could still be errors in the data!).
Some of you may have heard of Code for America. It’s an awesome program that encourages civic hackers, developers and designers to use their skills for the public good. Similar programs exist in several other countries – and now there is a German divison, too!
Mappable was excited to support the launch by organizing the Hamburg Open Data Day on February, 22 together with Marco Maas of OpenDataCity. The event was a full success with close to 30 people coding, mapping and discussing the whole day (and into the night). Some results can be found on the Open Data Day Hackdash.
Encouraged by the event we are now in the process of organizing a regular monthly meetup and forming an ‘OK Lab Hamburg’ (equivalent to the Code for America Brigades). The first one will take place on April 7. So drop by if you’re in town.
In July 2013 we’ve released a project named ‘one week of carsharing’, for which we’ve tracked and analyzed one week of carsharing usage in 19 cities throughout Europe and North America.
You can take a closer look at our work and the description how we realized it on our project page.
If you are looking for our project ‘one week of carsharing’, which we released yesterday, we are sorry to inform you, that we had to take the project offline. For further details see the project-page. We hope to bring it back online soon and will keep you informed through our blog.