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Topographic prominence

characterizes the height of a mountain or hill's summit by the vertical distance between it and the lowest contour line encircling it but containing no higher summit within it; it is a measure of the independence of a summit

In topography, prominence, also known as autonomous height, relative height or shoulder drop (in America) or prime factor (in Europe), is a concept that is used in the categorization of hills and mountains, also known as peaks. It is a measure of the independent stature of a summit.

The prominence of a peak is the height of the peak’s summit above the lowest contour line encircling it and no higher summit.

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