Visualization and Interaction Design
cf. city flows has two viewing modes. In the main one, we visualize trajectories of bike ride. Tracing urban movements accentuates different urban structures, and contrasts grid-plan cities like New York with historically grown cities such as Berlin.
We show characteristic fingerprints of selected bike stations in the secondary view. After the map and all other trails fade away, the selected stations show their journeys as small glyph. It then explodes into morning and evening, and into incoming and outgoing journeys, resulting in a small multiple of four glyphs for each station. This can reveal tempo-spatial mobility patterns, such as commuters arriving to an office district in the morning, and leaving the area in the evening.
We aimed to design our system in a highly aesthetic style in order to attract visitors in a semi-public space such as an exhibition area. Multiple cities are shown side by side to allow comparison with the each other. The views of all three cities are coordinated, and show the same time of day, and have the same map scale. Visitors from one of the shown cities can relate and compare known stations and areas with similar ones from other cities.
Our installation visualizes the flows and the relations within and between urban districts. It supports comparing one city with others, which can help citizens to become better informed and demand a greater system. In this sense, depicting the current state can help reflecting on how a future system should be. We believe that geovisualizations can empower citizens to make sense of the invisible layers in their environment, and help people to better participate in the creation of a smart and sustainable city.