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Length, when referring to measurement in one dimension (as in the length of a line segment or a or a piece of string), has a specialized meaning. So does height when it is used in conjunction with base.
Metres above sea level is the standard measurement of the elevation or altitude of: 1  a geographic location such as a town, mountain, or other landmark. 2  the elevation of the top of a building or other structure. 3  or the altitude of an airplane or other flying object.he elevation or altitude in metres above sea level of any location, object, or point, can be determined in a number of ways. The most common include: 1  Global Positioning System (GPS) which triangulates its location in reference to multiple satellites.