![]() ![]() We’re focusing on the trade in vegetables in 2014. This chord diagram was created by the China Power Project to illustrate how China, the world’s most populous country, feeds its 1.4 billion residents. Chord Diagram #2: International Food Trade It made us think, “If we’re getting our information about the refugee crisis from newspaper headlines alone, we aren’t seeing the full picture.” By turning UNHCR data into chords that represent the volume of people moving from one country to another, Professor Csala shows us in one impactful image that the majority of the world’s refugees and internally displaced people have not left their home countries. That’s why we find the visualization so compelling. The global and domestic flows of refugees and internally displaced persons can be overwhelming, but this chord diagram simplifies these interconnected relationships. This chord diagram is a great place to start if you’re not familiar with this visualization style. Professor Csala also provides a helpful overview of the methodology behind chord diagrams in the introduction to his web application. (It’s actually similar to the way we set up interactivity between chord diagrams and heat maps in StreetLight InSight). You can explore the data more deeply using an interactive web application he developed. It was created by Dénes Csala, an assistant professor of engineering at Lancaster University. This chord diagram visualizes the flow of refugees and internally displaced persons from 1994 to 2014. As you’ll see in the examples that follow, chord diagrams are useful not only for transportation but for all types of data analysis. The thickness is more intuitive for comparing total trip volume and scale than colors on a heat map. Unlike travel pattern heat maps, our chord diagrams allow you to quickly comprehend the magnitude of different flows, and compare the flow of traffic between several areas at once. So, why get so excited about a new type of diagram? Well, chord diagrams are a particularly powerful tool for analyzing complex, interconnected data streams. In this blog article, I’ll share five fascinating chord diagrams to show you why they’re becoming my #1 go-to StreetLight InSight visualization. (New to StreetLight Data? StreetLight InSight is our on-demand transportation analytics platform.) In our latest software release, we added two brand-new visualization types to StreetLight InSight®: the “heat matrix” and the “chord diagram.” You can join our upcoming training session to find out how these new visualizations work. Bar graphs and heat maps have long served as our trusty standbys – but these days, we’re thinking bigger. Since we first got started in 2011, our team has iterated on countless visualization options for our transportation analytics. Data visualization is one of our favorite topics here at StreetLight Data. ![]()
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