Paul SIMMONDS (VK5PAS)
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SOTA VK5/ SE-010

What is topographic prominence?

Picture
The SOTA Management Team recommends a minimum "relative height" or "prominence" for summits of 150 metres (about 492 feet).  Summits need to be distinct peaks.  In other words there must be a 'vertical separation' of at least the Association's prominence value, between the summits and their associated saddles (also known as cols).


So what is 'relative height'  or ' prominence' ? 

The summits of mountains have long been known by their elevation above mean sea level.  Now a growing community of climbers, mountain enthusiasts and mathematicians recognize that summits can also be measured by their elevation relative to the surrounding terrain.

Topographic Prominence (referred to as relative height by SOTA UK), is also called autonomous height, relative height, shoulder drop (in North America), or prime factor (in Europe).  You may also see it referred to as vertical distance.  

Prominence is defined as the vertical distance a given summit rises above the lowest col connecting it to a higher summit.  Or, put another way, it is the elevation difference between the summit of a peak and the lowest contour that contains the given peak and no higher peaks. Imagine the ocean rising to the exact point where a certain peak is the highest point on its very own island. At that point, the prominence is the elevation of the peak above the risen ocean.
That all sounds confusing, yet prominence is actually a fairly intuitive and commonly used concept.  The best way to visualize it is to imagine that you are on a major summit and you start hiking down a ridge. After descending for 1000 feet, you start climbing again and gain 200 vertical feet to gain a sub-peak along the ridge. This sub-peak has a prominence of 200 feet, since that is how far it rises above the col connecting it to the major summit.

To calculate prominence, you must know the elevation of a summit and the elevation of its key col. A problem arises when one or both of these elevations are not known precisely. 

In summary, prominence categorises the height of the mountain's or hill's summit by the elevation between it and the lowest countour line encircling it and no higher summit.  It is a measure of the independent stature of a summit.  In essence, how much a mountain stands out from its surrounding terrain.

For SOTA purposes, a peak is not a peak if it does not have the required 150 m prominence.

The SOTA General Rules define 'Relative height' as.....


"The height of a Summit relative to the surrounding countryside.  This is not related to height ASL, except where the surrounding countryside includes coastal areas.  This value, also referred to as Prominence, will never be less than 150m".

Section 3.5 (2) states.....


"Summits should be distinct peaks.  This means that there must be a vertical separation of at least the association's prominence value, between Summits and their associated cols (also known as saddles).  Peaks separated by a shallow col should be considered as a single Summit.  This principle ensures that there is a distinct climb associated with every Summit".




Information courtesy of:-
  1. Summits on the Air - General Rules.
  2. Wikipedia, www.en.wikipedia.org
  3. www.about.com
  4. Peaks List, www.peaklist.org
  5. Peakbagger.com, www.peakbagger.com
Picture
More information on topographic prominence can be found at.....

http://www.prominentpeaks.org.uk/prominence.php

Col or saddle

Col is the standard term used to refer to the lowest point on the ridge between two summits. There are many synonyms: Pass, Gap, Saddle, Notch, or Cut; Joch in German, Colle in Italian, etc.
Picture

Video on topographic prominence

Video on how to read a topographic map

Presentation on Prominence by VK5PAS.

prominence_-_sota.pptx
File Size: 18839 kb
File Type: pptx
Download File

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    • My QSL Manager, Charles M0OXO
    • My QSL card printer
  • VK5PAS PORTABLE
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  • VK5 PARKS AWARD
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    • My VK5 Parks activities >
      • Activator >
        • 2019
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        • 2017
        • 2016
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        • 2014
        • 2013
      • Hunter >
        • 2017
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        • 2014
        • 2013
      • Park to Park
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      • 2020
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      • 2016
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      • 2013
  • WORLD WIDE FLORA & FAUNA (WWFF)
    • My WWFF activity
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    • My WWFF videos >
      • 2020
      • 2019
      • 2018
      • 2017
      • 2016
      • 2015
      • 2014
      • 2013
    • Other activators - videos
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  • SUMMITS ON THE AIR (SOTA)
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    • SOTA in South Australia (VK5)
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    • My SOTA activation videos >
      • 2016
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      • 2013
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  • KEITH ROGET MEMORIAL NATIONAL PARKS AWARD
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    • 2020
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    • 2014
    • 2013
  • ISLANDS ON THE AIR (IOTA)
    • Kangaroo Island trip 2012
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  • ILLW - LIGHTHOUSE WEEKEND
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    • 2017
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    • 2012
    • Warburto Light
  • MILLS ON THE AIR
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  • QSL CARD CHECKING
    • DXCC Card checker
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    • CQ Awards
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  • CONTESTING
    • 2020
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    • 2018
    • 2017
    • 2016
    • 2015
    • 2014
    • 2013
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    • WIA Contest Champion
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  • 28 MHZ, 10 METRE BAND
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  • 6M, THE MAGIC BAND
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    • 2021
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    • Propagation articles
  • WORKING DX
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    • Interesting contacts
  • TIPS ON MAKING A QSO
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  • OVER THE HORIZON RADAR
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  • RASA
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  • GET TOGETHERS
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      • 2019
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  • LETTERS RECEIVED
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    • 2021
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    • 2014 >
      • SOTA & PARKS Symposium 2014
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    • 2013
  • SHORT WAVE LISTENING (SWL)
    • My SWL receivers
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  • SCANNING
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    • QSL cards received
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  • POLICE PATCH COLLECTING
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    • Australia >
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