Ceiling
In aviation, ceiling refers to the height above the ground level at which the lowest layer of clouds or obscuring phenomena (such as fog, haze, smoke) are reported to cover more than half of the sky. It is an important parameter for pilots as it determines the minimum altitude at which they can safely fly and navigate using visual references. The ceiling is usually reported in feet above ground level (AGL) and is measured using instruments such as ceilometers or by visual observations. A high ceiling indicates good visibility and allows for safe flying, while a low ceiling can restrict visibility and require pilots to use instrument flight rules (IFR) to navigate.
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