3. Click on a place to display its connectivity to other places.
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Place Connectivity Index (PCI) between two places is defined as as the normalized number of shared persons (e.g., unique Twitter users) between the two places during a specified time period (e.g., one year).
Learn more about the PCI and its applications here.
PCI matrices at various geographic levels and relevant datasets can be downloaded here.
World boundary data source: GADM. Data were generalized for web display.