Figure 6: Validating the coverage of the data extracts using publicly available PT route maps.
From: A collection of public transport network data sets for 25 cities
In the figure, we compare the official route map of Helsinki to a computer-generated map created based on the static network extract for Helsinki. In panel a, we show an excerpt of the official PT transportation map of Helsinki city center published in early 2018 (routes and layout: Helsinki Region Traffic, background map OpenStreetMap). The blue, green, orange, and purple lines correspond to bus, tram, subway, and train routes, respectively. In panel b, we show the computer-generated map used for validation purposes (background map OpenStreetMap). Note that on the computer-generated map, the lines do not follow the actual paths taken by the PT vehicles, but connect the two stops directly. By comparing the two maps, we can see that both maps contain same modes of PT and most PT lines can be found in both maps. However, given that the maps cover slightly different time frames, there are also some differences in the maps due to changes in the PT network. One such example is the new continuation of the subway line east from the city center.
