Imaginary lines connected with equal elevation from sea level are
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Imaginary lines joining all the points of equal elevation or altitude abovemean sea level. They are also called “level lines”. Contour Interval: Interval between two successive contours.A contour line or isoline connects points on a map that are of equal value. Examples of contour lines or isolines are isobars (pressure) and isotherms (temperature). Perhaps the prototypical example of a contour line is that which connects points of equal elevation (that is, height above sea level).In cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. A contourmap is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.