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. More » Geography Maps & Cartography

A depression contour line is a marking on a map indicating a low point of land completely surrounded by more elevated land. The area is represented by closed concentric lines. The inner depression contour lines indicate ... More » Science Earth Science Landforms

Hachured contour lines are circular lines on a topographic map that have little teeth, or hash marks, that point into a depression that is below a higher elevation. Also known as depression contours, common geologic feat... More » Art & Literature Fine Art Drawing
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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 alo... More » Geography Maps & Cartography

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... More » Geography Maps & Cartography

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 co... More » Geography Maps & Cartography

On topographic maps, V-shaped contour lines that point downhill indicate sharp, narrow ridge lines. Ridge lines help people recognize areas of high and low ground when hiking, fishing, hunting or engaging in other outdoo... More » Geography Maps & Cartography