Key:surveillance:type
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 surveillance:type
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Specifies the type of surveillance 
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| Group: properties |
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| Requires |
| Useful combination |
Status: de facto
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surveillance:type=* specifies the type of surveillance being undertaken.
Values
- 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 license-plate recognition, a.k.a. number-plate recognition in the UK (ANPR): a system which automatically reads license plates on vehicles. In parking entries, for example.
- gunshot_detector: One of a series of microphones used to pinpoint the source of detected gunshots in a given area