The blimp could be useful in crime, ruining people's alibi's, recording crimes in action, trailing cars, spotting weed farms, tracking suspects movement, monitoring gang houses, drug deliveries. stuff like that.
Its just retarded cuz its the police service that needs to learn to investigate crime like they really want results.
The blimp could also be used by the works and transport division for making topographical maps and observing traffic flow and congestion, i'm sure they could use it to make thier construction and planning more efficent. Would they? who knows...
I'm sure it has infrared and ultraviolet cameras so it could see at night too so it could do this around the clock.