Contour Line

A line on a map that traces locations where the value of a variable is constant. For example, contour lines of elevation trace points of equal elevation across the map. All points on the “ten foot” contour line are ten feet above sea level.

Related terms:

• Contour Map
• contour-change line
• structural contour map
• Topographic Map
• pressure contour
• structure-contour map
• isogonic line
• height-change line
• isotimic line
• structure contour