PlateReaderMap begins with public map records rather than a claim of direct access to every agency or manufacturer system. Its primary camera-location source is OpenStreetMap (OSM), a community-maintained geographic database.

OSM contributors can describe an ALPR with tags including man_made=surveillance and surveillance:type=ALPR. Optional tags may identify a manufacturer, operator, direction, mount, or model. The OSM ALPR tagging documentation explains the convention and its useful tag combinations.

From public records to map features

The collection process has several deliberate steps:

  1. Query relevant OSM records with the Overpass API.
  2. Retain each source object’s stable identity and relevant original tags.
  3. Reject invalid coordinates and collapse clear duplicates conservatively.
  4. Normalize obvious spelling variants while preserving the source value.
  5. Assign states, counties, and places through an offline geographic join.
  6. Publish map tiles and aggregate statistics only after validation checks pass.

For U.S. jurisdiction boundaries, the Census Bureau’s TIGER/Line shapefiles provide geographic boundaries and stable codes that can be joined to other Census data.

What community mapping cannot guarantee

OSM is updated by many contributors at different times. A camera can be missing, misplaced, mistagged, duplicated, or left in the database after conditions change. Optional fields are often absent. PlateReaderMap does not infer an operator or manufacturer when the source does not document one.

The map is therefore a view of documented public records, not a complete inventory or a live operational feed. PlateReaderMap also does not make automated edits back to OSM.

Attribution

OpenStreetMap data is available under the Open Database License. The OpenStreetMap Foundation’s attribution guidelines explain how public maps and derived databases should credit OpenStreetMap. PlateReaderMap displays OpenStreetMap attribution and links readers to the applicable license information.

Sources and further reading