A contour in geography refers to a line on a contour or topographical map that designates a specific and constant elevation above sea level. Contour lines are used to express a three-dimensional image of terrain on a two-dimensional piece of paper.
Contour lines never cross one another on a topographical map. The proximity of the contour lines to each other also illustrates the steepness of the pictured geographical feature. Lines that are closer to one another suggest a sharp slope, whereas lines that are farther apart designate a more gradual slope. The space between each contour line is called a contour interval. The contour interval always expresses the same distance regardless of how close the contour lines are to one another on a map.Learn More
The term "contour interval" refers to the vertical distance between contiguous contour lines in terms of elevation. Commonly illustrated on a topographic map, the elevations between contour lines are uniformly spaced along vertical distances.Full Answer >
The space between contour lines on a topographical map is a contour interval. The contour interval is an even space that represents an increase in elevation. For instance, if the map uses a 20-foot interval, there are contour lines at zero, 20, 40, 60, 80 and 100 feet.Full Answer >
Contour lines on a map indicate elevation or depth. Numeric notations on contour lines refer to the level of elevation, or height above sea level.Full Answer >
Elevation above sea level, or altitude, is the distance of a location above sea level. Sea level is calculated as an average level for one or more oceans.Full Answer >