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You are limiting the applicability of 'depth'. You say depth denotes the distance below sea-level to a point on an object located below sea level This isn't strictly correct. Depth is usually used for all negative distances from any surface, not just below sea level. In all industries and applications that I have worked with, depth is used to ...


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Since GIS is a very multidisciplinary subject, there are always going to be many differences in terminology for the same basic concept. Which is "correct" depends on the specific context. Some synonyms for height: elevation, rise, altitude, ascent, relief, hypsography, orography. Some synonyms for "opposite of height": depth, fall, invert, descent, ...


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The term height can be used for both above and below ground measurements. My definition of height includes the vertical distance from the origin of measurement--this can be either + or -. For example, if I am standing at the bottom of a mineshaft and use my laser range finder to determine the height to the surface, the measurement may be 1000 m. ...



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