In topography, prominence measures the 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. A peak's key col is a unique point on this contour line and the parent peak is some higher mountain, selected according to various criteria.
DefinitionsThe prominence of a peak may be defined as the minimum height necessary to descend to get from the summit to any higher terrain, which can be calculated for a given peak in the following way: for every path connecting the peak to higher terrain, find the lowest point on the path; the key col is defined as the highest of these points, along all connecting paths; the prominence is the difference between the elevation of the peak and the elevation of its key col. See Figure 1. Under this definition, the prominence of Mount Everest is not defined as there is no higher point. An alternative definition, otherwise equivalent, is that the prominence is the height of the peak's summit above the lowest contour line encircling it, but containing no higher summit within it.
IllustrationThe following mental exercise may illustrate the meaning of topographic prominence. Imagine a peak and imagine that an imaginary sea level rises to the peak. Now slowly lower the imaginary sea level and an imaginary island appears beneath your feet. The island will grow and will merge with other islands that emerge. Eventually, the island will touch an island with a higher peak than the initial island The summit of that island is the parent peak of the summit, the point at which the two islands touch is the key col of the summit, and the elevation rise from the key col to the summit is the topographic prominence of the summit.
The parent peak may be either close or far from the subject peak. The summit of Mount Everest is the parent peak of Aconcagua in Argentina at a distance of 17,755 km, as well as the parent of the South Summit of Mount Everest at a distance of 360 m. The key col may also be close to the subject peak or far from it. The key col for Aconcagua, if sea level is disregarded, is the Bering Strait at a distance of 13,655 km. The key col for the South Summit of Mount Everest is about 100 m distant.
In mountaineeringProminence is interesting to many mountaineers because it is an objective measurement that is strongly correlated with the subjective significance of a summit. Peaks with low prominence are either subsidiary tops of some higher summit or relatively insignificant independent summits. Peaks with high prominence tend to be the highest points around and are likely to have extraordinary views.
Only summits with a sufficient degree of prominence are regarded as independent mountains. For example, the world's second-highest mountain is K2. While Mount Everest's South Summit is taller than K2, it is not considered an independent mountain because it is a sub-summit of the main summit.
Many lists of mountains take topographic prominence as a criterion for inclusion, or cutoff. John and Anne Nuttall's The Mountains of England and Wales uses a cutoff of 15 m, and Alan Dawson's list of Marilyns uses 150 m.. In the contiguous United States, the famous list of "fourteeners" uses a cutoff of 300 ft / 91 m. Also in the U.S., 2000 ft of prominence has become an informal threshold that signifies that a peak has major stature.
Lists with a high topographic prominence cutoff tend to favor isolated peaks or those that are the highest point of their massif; a low value, such as the Nuttalls', results in a list with many summits that may be viewed by some as insignificant.
While the use of prominence as a cutoff to form a list of peaks ranked by elevation is standard and is the most common use of the concept, it is also possible to use prominence as a mountain measure in itself. This generates lists of peaks ranked by prominence, which are qualitatively different from lists ranked by elevation. Such lists tend to emphasize isolated high peaks, such as range or island high points and stratovolcanoes. One advantage of a prominence-ranked list is that it needs no cutoff since a peak with high prominence is automatically an independent peak.
Parent peakIt is common to define a peak's parent as a particular peak in the higher terrain connected to the peak by the key col. If there are many higher peaks there are various ways of defining which one is the parent, not necessarily based on geological or geomorphological factors. The "parent" relationship defines a hierarchy which defines some peaks as subpeaks of others. For example, in Figure 1, the middle peak is a subpeak of the right peak, which is in turn a subpeak of the left peak, which is the highest point on its landmass. In that example, there is no controversy over the hierarchy; in practice, there are different definitions of parent. These different definitions follow.
A special case occurs for the highest point on an oceanic island or continent. Some sources define no parent in this case; others treat Mount Everest as the parent of every such peak with the ocean as the "key col".
Encirclement or island parentageAlso called prominence island parentage, this is defined as follows. In figure 2 the key col of peak A is at the meeting place of two closed contours, one encircling A and the other containing at least one higher peak. The encirclement parent of A is the highest peak that is inside this other contour. In terms of the falling-sea model, the two contours together bound an island, with two pieces connected by an isthmus at the key col. The encirclement parent is the highest point on this entire island.
For example, the encirclement parent of Mont Blanc, the highest peak in the Alps, is Mount Everest. Mont Blanc's key col is a piece of low ground near Lake Onega in northwestern Russia, on the divide between lands draining into the Baltic and Caspian Seas. This is the meeting place of two 113 m contours, one of them encircling Mont Blanc; the other contour encircles Mount Everest. This example demonstrates that the encirclement parent can be very far away from the peak in question when the key col is low.
This means that, while simple to define, the encirclement parent often does not satisfy the intuitive requirement that the parent peak should be close to the child peak. For example, one common use of the concept of parent is to make clear the location of a peak. If we say that Peak A has Mont Blanc for a parent, we would expect to find Peak A somewhere close to Mont Blanc. This is not always the case for the various concepts of parent, and is least likely to be the case for encirclement parentage.
Figure 3 shows a schematic range of peaks with the color underlying the minor peaks indicating the encirclement parent. In this case the encirclement parent of M is H whereas an intuitive view might be that L was the parent. Indeed, if col "k" were slightly lower, L would be the true encirclement parent.
The encirclement parent is the highest possible parent for a peak; all other definitions pick out a peak on the combined island, a "closer" peak than the encirclement parent, which is still "better" than the peak in question. The differences lie in what criteria are used to define "closer" and "better."
Prominence parentageThe parent peak of peak A can be found by dividing the island or region in question into territories, by tracing the two hydrographic runoffs, one in each direction, downwards from the key col of every peak that is more prominent than peak A. The parent is the peak whose territory peak A is in.
For hills with low prominence in Britain, a definition of 'parent Marilyn' is sometimes used to classify low hills. This is found by dividing the region of Britain in question into territories, one for each Marilyn. The parent Marilyn is the Marilyn whose territory the hill's summit is in. If the hill is on an island whose highest point is less than 150m, it has no parent Marilyn.
Prominence parentage is the only definition used in the British Isles because encirclement parentage breaks down when the key col approaches sea level. Using the encirclement definition, the parent of almost any small hill in a low-lying coastal area would be Ben Nevis, an unhelpful and confusing outcome. Meanwhile, 'height' parentage is not used because there is no obvious choice of cutoff.
This choice of method might at first seem arbitrary, but it provides every hill with a clear and unambiguous parent peak that is taller and more prominent than the hill itself, while also being connected to it. The parent of a low hill will also usually be nearby; this becomes less likely as the hill's height and prominence increase. Using prominence parentage, one may produce a 'hierarchy' of peaks going back to the highest point on the island. One such chain in Britain would read:
Billinge Hill → Winter Hill → Hail Storm Hill → Boulsworth Hill → Kinder Scout → Cross Fell → Helvellyn → Scafell Pike → Snowdon → Ben Nevis.
At each stage in the chain, both height and prominence increase.
Line parentageLine parentage, also called height parentage, is similar to prominence parentage, but it requires a prominence cutoff criterion. The height parent is the closest peak to peak A that has a greater height than A, and satisfies some prominence criteria.
The disadvantage of this concept is that it goes against the intuition that a parent peak should always be more significant than its child. However it can be used to build an entire lineage for a peak which contains a great deal of information about the peak's position.
Other criteriaTo choose among possible parents, instead of choosing the closest possible parent, it is possible to choose the one which requires the least descent along the ridge.
In general, the analysis of parents and lineages is intimately linked to studying the topology of watersheds.
Issues in choice of summit and key colAlteration of the landscape by humans and presence of water features can give rise to issues in the choice of location and height of a summit or col. In Britain, extensive discussion has given rise to a protocol that has been adopted by the main sources of prominence data in Britain and Ireland. Other sources of data commonly ignore man-made alterations, but this convention is not universally agreed upon; for example, some authors discount modern structures but allow ancient ones. Another disagreement concerns mountaintop removal, though for high-prominence peaks, the difference in prominence values for the two conventions is typically relatively small.
ExamplesThe key col and parent peak are often close to the subpeak but this is not always the case, especially when the key col is relatively low. It is only with the advent of computer programs and geographical databases that thorough analysis has become possible.
The key col of Denali in Alaska is a 56 m col near Lake Nicaragua. Denali's encirclement parent is Aconcagua, in Argentina, and its prominence is 6,138 m. To further illustrate the rising-sea model of prominence, if sea level rose 56 m, North and South America would be separate continents and Denali would be 6138 m above sea level. At a slightly lower level, the continents would still be connected, and the high point of the combined landmass would be Aconcagua, the encirclement parent. Note that, for the purposes of this article, man made structures such as the Panama Canal are not taken into account. If they were, the key col would be along the 26 m Gaillard Cut and Denali would have a prominence of 6,168 m.
While it is natural for Aconcagua to be the parent of Denali, since Denali is a major peak, consider the following situation: Peak A is a small hill on the coast of Alaska, with elevation 100 m and key col 50 m. Then the encirclement parent of Peak A is also Aconcagua, even though there will be many peaks closer to Peak A which are much higher and more prominent than Peak A. This illustrates the disadvantage in using the encirclement parent.
Mount Whitney has its key col away in New Mexico at 1347 m on the Continental Divide. Its encirclement parent is Pico de Orizaba, the highest mountain in Mexico. Orizaba's key col is back along the Divide, in British Columbia.
The key col for Mount Mitchell, the highest peak of the Appalachians, is in Chicago, the low point on the divide between the St. Lawrence and Mississippi River watersheds.
A hill in a low-lying area like the Netherlands will often be a direct child of Mount Everest, with its prominence about the same as its height and its key col placed at or near the foot of the hill, well below, for instance, the 113-meter-high key col of Mont Blanc.
Calculations and mathematicsWhen the key col for a peak is close to the peak itself, prominence is easily computed by hand using a topographic map. However, when the key col is far away, or when one wants to calculate the prominence of many peaks at once, a computer is quite useful. Edward Earl has written a program called WinProm
which can be used to make such calculations, based on
a Digital Elevation Model. The underlying mathematical theory is called "Surface Network Modeling," and is closely related to Morse Theory. Andrew Kirmse extended this method to find every point on Earth with at least 100 feet of prominence.
A note about methodology: when using a topographic map to determine prominence, one often has to estimate the height of the key col based on the contour lines. Assume for simplicity that only the col elevation is uncertain. There are three simple choices. The pessimistic, or clean prominence, assumes that the col is as high as it can be, i.e., its elevation is that of the higher contour line nearest the saddle. This gives a lower bound on the possible prominence of the peak, ignoring map error; inaccuracies in mapping lead to further uncertainties and a larger error bound. Optimistic prominence assumes that the col is as low as possible, yielding an upper bound value for the prominence. Midrange or mean prominence uses the mean of these two values. Mean prominence is sometimes referred to as rise. In Britain, where topographic mapping is more detailed than in many countries, it is customary to use a fourth method: interpolated prominence. The true prominence is estimated by visualising the three dimensional surface in the neighborhood of the col and interpolating between the enclosing contours.
Which methodology is used depends on the person doing the calculation and on the use to which the prominence is put. For example, if one is making a list of all peaks with at least 2,000 ft of prominence, one would use the optimistic prominence, to include all possible candidates. If one wishes to present the most accurate data for the peaks, mean or interpolated prominence would be appropriate as the other measures give biased estimates.
Wet prominence and dry prominenceThere are two varieties of topographic prominence: wet prominence and dry prominence. Wet prominence is the standard topographic prominence discussed in this article. Wet prominence assumes that the surface of the earth includes all permanent water, snow, and ice features. Thus, the wet prominence of the highest summit of an ocean island or landmass is always equal to the summit's elevation.
Dry prominence, on the other hand, ignores water, snow, and ice features and assumes that the surface of the earth is defined by the solid bottom of those features. The dry prominence of a summit is equal to its wet prominence unless the summit is the highest point of a landmass or island, or its key col is covered by snow or ice. If its highest surface col is on water, snow, or ice, the dry prominence of that summit is equal to its wet prominence plus the depth of its highest submerged col.
The dry prominence of Mount Everest is, by convention, equal to its wet prominence plus the depth of the deepest hydrologic feature, or 19,759 m. The dry prominence of Mauna Kea is equal to its wet prominence plus the depth of its highest submerged col, or about 9330 m, giving it the world's second greatest dry prominence after Mount Everest. The dry prominence of Aconcagua is equal to its wet prominence plus the depth of the highest submerged col of the Bering Strait, or about 7012 m.
Dry prominence is also useful for measuring submerged seamounts. Seamounts have a dry topographic prominence, a topographic isolation, and a negative topographic elevation.