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Vertical coordinate

The vertical distance (i.e., distance measured along a vertical) of a point above or below a surface of reference (datum). The vertical coordinate of a point may be positive or negative, depending on whether the point is above or below the surface of reference. This surface may be assigned a large positive value so that all vertical coordinates referred to it will be positive. The terms elevation and height are often used for vertical coordinate. The term elevations is best reserved, however, for vertical coordinates with respect to the geoid. The term height is best reserved for distance measured along a perpendicular, e. G. , geodetic height.

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