A contour line (also isoline, isopleth, or isarithm) of a function of two variables is a curve along which the function has a constant value. It is a cross-section of the three-dimensional graph of the function f(x, y) parallel to the x, y plane. In cartography, a contour line (often just called a `contour`) joins points of equal elevation (heig.....
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http://en.wikipedia.org/wiki/Contour_line
(from the article `drafting`) Automobile bodies, aircraft and ship hulls, and the irregular terrain of the natural site of a dam, bridge, or highway, are studied and detailed by ...
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http://www.britannica.com/eb/a-z/c/135
A line on a map that traces locations where the value of a variable is constant. For example, contou
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A line connecting points, on a land surface or sea bottom, which have equal ELEVATION. It is called an ISOBATH when connecting points of equal DEPTH below a DATUM.
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a line joining points of equal elevation on a surface. · the representation of such a line on a map. · a line parallel to a trace. Cf. trace (def. 11). Also called
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https://www.infoplease.com/dictionary/contour-line
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