Crime Concentration Explorer
Update
Since its original publication, the demo app mentioned in this article has been replaced with an evolving multipage app with greater coverage and functionality. Links in this page have been updated to point to the newer implementation.

Rationale
This app has been built as a proof-of-concept tool for practitioners and policymakers with an interest in the patterns of crime concentration, using only publicly available data. It enables users to visualise crime hotspots over time for a given Police Force Area (PFA).