Arcs

After taking a close look at airports in South-East Asia, let's take a view of global flight routes. We saw that there are many airports almost everywhere on the world map. There will be exponentially more flight routes. So, to get a view of flight routes that we can comprehend and summarize while looking at one chart, we filter for flight routes that start from the city of Tehran, in Iran:

Setting the parameters for flight routes across Asia

You can select Fixed Color and Stroke Width to change the aesthetics of the Arc map. We can see that Iran in 2017 has only one international flight route, to Saudi Arabia:

The flight routes in Asia (the other place names are not important)

We will now use the Map Style feature of the Arc chart to use satellite images. This time, we select one of the largest cities in the world, and one that is mentioned in the chronicles—...