Further information can be found in the SWP Research Paper Cracks in the Internet’s Foundation.
The illustration shows cables that are currently in operation or are expected to be in operation until 2022. Places where a large number of cables land are highlighted.
Source: TeleGeography, www.submarinecablemap.com; © 2019 Stiftung Wissenschaft und Politik (SWP)
Places where more than 10 cables arrive at one landing point or where several landing points not more than 10 km apart form a cluster where more than 10 cables arrive.
Places where more than 5 cables arrive at a single landing point or where multiple landing points not more than 10 km apart form a cluster where more than 5 cables arrive.
The data from Submarine Cable Map (https://github.com/telegeography/www.submarinecablemap.com) form the basis for the representation. These contain geodata for all landing points and information about the cables that land there. The cluster algorithm DBSCAN (https://en.wikipedia.org/wiki/DBSCAN) was used to identify cluster of landing points. The parameters for "eps" were set to 10 kilometers and "min_sample = 10" (for category 1) or > "min_sample = 5" (for category 2).