I've just been sent some info about a US CCTV camera that claims to offer identification at 20km and usable IR lighting for 2km.Now my elementary maths is failing me, so can anyone help me work out how high this camera must be mounted, allowing for the curvature of the earth, to allow it to see a man 20km away?
Is the man standing on a hill or level ground
1.17 times the square root of your height is the equation I think.
Which would make it about 68 metres high.
would need to be mounted on a tower about 250 feet high.
..you are both almost in agreement.However as you can see the French coast on a clear day, from Dover a distance of 21 miles, and 20km is only 12.4 miles I don't think you really need a tower.
White cliffs will do just as well!
I would think FE's estimation is probably right, I worked mine out in nautical miles.
Thanks everyone, I was thinking around 200 feet.It'll need to be a very strong tower, or the camera will be unusable...
Maybe they're standing on top of the cliffs!
with a good diagram about half way down.click hereRegards,Simsy
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