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** The OSI public .. by tamjk   (Show all posts)
Onzy
2015-09-02 10:27:52
"Droppa in the Caha Mountains" from Onzy Expand pics
Droppa in the Caha Mountains (Expand pics)
A few words on the Arderin Begs.
Those who keep a sharp eye on the site will have noticed the addition of a new list of hills entitled the Arderin Begs. Briefly, these are hills over 500m in height with a prominence of between 15 and 30m. However, if your interest in the website is for summiteering (aka bagging), I think it is worthwhile explaining further how they fit into our range of lists.

Firstly, 'prominence' is, unsurprisingly, a measure of how prominent a hill is; it is measured by calculating the height of the hill over the col between it and the nearest higher hill.

Up to now, our principal prominence-related lists were:
Vandeleur-Lynam (V-L) – height of 600m+ with prominence of 15m+
Arderins – height of 500m+ with prominence of 30m+

These lists overlap partly; e.g. hills over 600m with prominence over 15m will be V-Ls, but may also be Arderins if their prominence is over 30m.

The inconsistency in the prominence requirement for each list meant that there were a range of hills not currently being listed; those hills of 500–600m, with a prominence of 15-30m. There were a number of significant hills in this category, named on OS maps, regularly mentioned by our contributors and worthy of visiting and recognising. Examples of these hills include Kanturk, Black Rock Mountain and Droppa.

In order to include these hills and to ensure complementarity with MV’s prime list, the Arderins, we relaxed the prominence requirement from 30m to 15m which generated a list of ‘almost Arderins’, the Arderin Begs, which are now defined as 500m+ hills with a prominence of between 15 & 30m.

The Arderins and Arderin Begs form two discrete lists with no overlap. Every V-L is either an Arderin or an Arderin Beg, depending on its prominence.

Finally a couple of practical effects of the process of adding the new hills:

The process was based on OS maps and makes use of averaging of contour lines in cases where no spot height is given. A number of hills with apparent prominences of under 15m resulting from this averaging process, have also been added to the database, on the basis that accurate measurement might at some stage indicate a greater than expected prominence.

The new summits have been allocated grid references based on 6 digits, unless for some reason a more exact reference was available. This is deliberate in that to use a 10-digit reference might have implied a certainty that we don’t have! As a result, some of the summits can be seen to be clearly off station, appearing outside the upper contours in cases. Again, this is the result of using map based analysis and we hope gps-toting members will make use of the ‘Improve Grid Ref’ tool on each hill’s page to help us correct this over time.
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RECENT CONTRIBUTIONS 1 2 3 .. 19 Next page >>
Track
Brockagh Tops
Bunsen7 3 hours ago.
Similar track to a number of others which I used for guidance. Parked at the forest entrance having turned up at the ... walk, Len: 14.5km, Climb: 517m, Area: Brockagh Mountain SE Top, Dublin/Wicklow

  
Forum: General
Do your VITAL bit for hillwalking maps soon.
simon3 4 hours ago.
Ordnance Survey Ireland bring out a high proportion of the maps of interest to hillwalkers in Ireland. They are the only source of mapping for vast swathes of the island of Ireland. But since they...

  
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Onzy 20 hours ago.
Classic route in the lakes... walk, Len: 15.3km, Climb: 1062m, Area: Ullock Pike, Lake District - Northern Fe...

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La Gomera - GR132
GSheehy 2 days ago.
In 1492, Columbus set out from San Sebasti

  
Summit Summary
Doughruagh: Rocky summit with access issues from Kylemore Abbey
Collaborative entry Last edit by: liz50 4 days ago.
Located behind Kylemore Abbey, it has been reported that access from the grounds is no longer allowed. It is possible to park in a small lay-by at L77637 58711 and walk approx 30m along the road t...

  
Summit Summary
Doughruagh South Top: Twin of Doughruagh main top
Collaborative entry Last edit by: liz50 4 days ago.
Located behind Kylemore Abbey, it has been reported that access from the grounds is no longer allowed. It is possible to park in a small lay-by at L77637 58711 and walk approx 30m along the road t...

Summit Summary
Raghtin More: The smallest Inishowen Arderin
Collaborative entry Last edit by: liz50 5 days ago.
The easiest approach is to park at Urrismenagh viewpoint carpark C317 443 and follow the track to its highest point. From here you can avoid Crockmain and carry on towards Raghtin More to the Nort...

  
Summit Summary
Crockmain: An uninspiring summit with great views
Collaborative entry Last edit by: liz50 5 days ago.
The easiest approach is to park at Urrismenagh viewpoint carpark C317 443 and follow the track to its highest point before heading north over heather to the summit. Alternatively from Mamore Gap c...

  
Summit Summary
Knocknanacree: Views to Slieve Mish and the Dingle Peninsula
Collaborative entry Last edit by: liz50 5 days ago.
Summit can be approached from the West by parking near Minard Castle V556 992 and following a rough track uphill past a quarry and onto the summit ridge.A shorter steeper approach is possible from...

Summit Summary
Currywongaun: Rough and Rocky
Collaborative entry Last edit by: liz50 4 days ago.
Park off road in a small lay-by at L72134 59157 and ascend the spur in a roughly Easterly direction to the summit. Usually climbed en-route to its larger neighbor Doughraugh.

  
Summit Summary
Teeromoyle Mountain: A summit in the middle of a classic Horseshoe walk
Collaborative entry Last edit by: liz50 5 days ago.
This summit is usually accessed whilst walking the Glenbeigh Horseshoe. A shortened version taking in the 4 central 600m summits in the centre of the horseshoe Teeromoyle, Coomacarrea, Mullaghnara...

  
Summit Comment
Bruse Hill: Bruse
Nekarsulm 6 days ago.
Track up from the quarry is overgrown. I partially walked up a small stream, as it at least cuts its way through the whins. Climbing straight upwards, you will see places where some earlier climbe...


RECENT CONTRIBUTIONS 1 2 3 .. 19 Next page >>