Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.Altitude is defined based on the context in which it is used (aviation, geometry, geographical survey, sport, and more). As a general definition, altitude is a distance measurement, usually in the vertical or "up" direction, between a reference datum and a point or object. The reference datum also often varies according to the context. Vertical distance measurements in the "down" direction are commonly referred to as depth
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