Elevation above mean sea - level ?

平均 海水面?

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Figure 3.4.8 Trace of mean sea level pressure recorded at Cheung Chau on 22 August 2008.

图3.4.8长洲在二零零八年八月二十二日录得的海平面气压变化.

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Height: The altitude of your observing site above the mean sea - level, in meters.

海拔: 你的观测地点的海拔高度, 单位是米.

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The highest point of an airport's usable runways measured in feet from mean sea level.

指海平面与机场可用跑道最高点之间的距离,单位是英尺.

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