This is a simple but interactive visualization I’ve created as part of my investigation of ALPR database disclosures by police departments around the United States. Other visualizations can also be seen here.
I am featured in a story from today’s All Things Considered on National Public Radio (NPR) on the topic of automated license plate reader (ALPR) data. I discuss some of my preliminary data analysis using a few databases received from the Seattle Police Department under state freedom of information law.
Questions Remain About How To Use Data From License Plate Scanners (link to transcript on NPR’s website)
By Martin Kaste
May 27, 2015
I’ve been busy analyzing a number of automated license plate recognition (ALPR) databases disclosed by the Seattle Police Department. These databases were disclosed under state freedom of information (FOI) law, and I am currently mapping scans of license plates, visualizing scanning patterns, and I hope to publish some additional findings in the near future, in the meantime, here’s a sneak peak at the number of scans by 2010 Census Tract, darker colors mean more scans. Hover your mouse over any tract to see the number of scans that occurred within its boundaries. The database covers scans by the SPD’s PIPs system, which is mounted on Patrol Vehicles that roam the city scanning plates. See the Viz here.