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Height, altitude and vertical extent
- Height: Vertical distance from the point of observation on the Earth’s surface to the point being measured.
- Altitude: Vertical distance from mean sea level to the point being measured.
- Height/Altitude of cloud base: For surface observations, height of the cloud base above ground level; for aircraft observations, altitude of the cloud base above mean sea level.
- Vertical extent: Vertical distance from a cloud’s base to its top.