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Some sites have more corners than three sliders can show. Then just describe it to us. We will look at it and come back with an assessment of the surveillance quality your project actually needs.
You do not have to know any of them exactly. But the clearer these three points are, the more concretely we can answer, and the less we have to ask afterwards.
Where exactly should the camera be looking? At the gate, the till, the yard, the entrance. Do not ask yourself where the camera should hang, but where something happens. Every one of those places gets its own number, because the same camera reaches a different pixel density at the gate than at the fence behind it.
Should the recording show that somebody was there at all? Or should it show whether that was your own employee? Or should it hold up in court? Those are three different tasks. The standard names 125 px/m for Recognise and 250 px/m for Identify.
How far away is the spot, and how high should the camera hang? An estimate is enough for now. Together the two give the slant distance — the real line of sight — and that is always longer than the walk across the site plan. This is exactly where many plans come apart.
