Service Requests received by 311. The following Service Requests have their location randomized: Dog Complaints, Graffiti, Mosquito Complaints, Neighborhood Liveability Complaints, Sewer Backups, and Vacant or Derelict Building Complaints. The randomization function changes the location to less than 500m in the X and Y directions, and always within the same neighbourhood. The randomization occurs as a mechanism to ensure privacy for sensitive service requests.