Questions · Cameras
How many cameras does it take to cover a yard?
It comes out of the detail you need and the width each camera takes in, and that calculation is done before buying anything. A camera covers a width of scene that depends on its lens and on the distance; the sensor's pixels are spread across that width; and from that come the pixels per metre reaching each point. If faces are needed at the staff entrance and seeing that somebody is there is enough on the lorry apron, it is not the same number of cameras even though it is the same yard.
The calculation is done zone by zone, not by total square metres. In an ordinary yard there are usually three different things: the entrances, where face or number plate detail is needed and the cameras go low and narrow; the perimeter, where detecting is enough and the cameras go high and wide; and the points where things actually happen —the loading bay, the waste area, where the forklifts park—, which get a camera of their own.
What does not work is spreading the money that would have bought twelve well-placed cameras across twenty. Twenty cameras that do not reach the detail you needed cover the same, worse, and with twenty fields of view to check.
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