From OpenStreetMap Wiki
|Specifies the type of surveillance|
|Used on these elements|
|Tools for this tag|
surveillance:type=* specifies the type of surveillance being undertaken.
- camera: A camera is surveying; what it feeds is unspecified. The most common.
- guard: A (human) guard. Where the sensitivity of the location justifies the cost.
- ALPR: Automatic licence-plate recognition: a system which automatically reads licence plates on vehicles. In parking entries, for example.