Seattle Police Dept ALPR Scans by Census Tract (Jan 9-Apr 6, 2013)

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.