a contour line on a topographic map joins points of equal value.
a contour line on a topographic map joins points of equal value.
what is a contour line on a topographic map?
joins points of equal value
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, so that the curve joins points of equal value. it is a plane 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 (height) above a given level, such as mean sea level. a contour map 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. the contour interval of a contour map is the difference in elevation between successive contour lines.
contour line
topographic map









































in modern mapping, a topographic map is a type of map characterized by large-scale detail and quantitative representation of relief, usually using contour lines, but historically using a variety of methods. traditional definitions require a topographic map to show both natural and man-made features. a topographic survey is typically published as a map series, made up of two or more map sheets that combine to form the whole map. a contour line is a line connecting places of equal elevation.









































natural resources canada provides this description of topographic maps:
topographic map