[bmcahren]

Your color scheme is the opposite of what I would expect.

Worst resolution = Red/Orange

Acceptable resolution = Yellow

Best resolution = Green/Blue

[jstanley]

Maybe it's intended for helping people evade CCTV, rather than helping people spec CCTV installations.

[Tempest1981]

Right, why is 250 ppm bad (red), and 125 ppm good (green)?

Or is it that the camera can't focus closer than 5m distance?

Doesn't seem related to installation height, but that's another consideration.