topographic prominence
measure for the independence of a summit defined as its relative height based on the difference between its absolute elevation and the lowest contour line encircling it but containing no higher summit within it
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With reference to peak B, contrast between topographic isolation and prominence
In topography, prominence (also referred to as autonomous height, and shoulder drop in US English, and drop in British English) is the relative height of a mountain or hill's summit relative to the lowest contour line encircling it but containing no higher summit within it. It is a measure of the independence of a summit. The key col ("saddle") around the peak is a unique point on this contour line and the parent peak (if any) is some higher mountain, selected according to various criteria.
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