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simon3
2009-02-19 21:33:26
Isolation.
Context of comment:Feeling isolated?
Well different summits have different isolations. You can see one form of the figures for Irish summits here: http://www.mountainviews.ie/mv/irl150list.php (Click on Isolation or you can sort on it)

Message:I was asked to define this recently, so for anyone that is interested here is some background information.

The Isolation figure in this listing is simply the distance from a summit to the next nearest in the MountainViews list of any height. Since inclusion in the list is not strictly controlled, isolation isn't either. Distance is computed using the national grid. The prominence figure is one we have been playing with but haven't as yet included in the 7 main list types that MV supports - haven't had much feedback as yet. It gives an idea of what is the most isolated peak which is interesting from the point of view of the quality of remoteness it may have. It is also useful when planning trips. A high isolation is likely to mean a longish journey to summit just one peak. Currently Croghan Hill (234m) in the North Midlands area at N482 332 is 31.9k from any other summit on the list which is the highest isolation.

Isolation has been proposed as a way of constructing lists. The usual form of this seen in connection with mountain summits is usually termed "Topographic Isolation" and is the distance from a summit to the nearest higher ground (great circle)
See http://en.wikipedia.org/wiki/Topographic_isolation
This is further described in http://www.peaklist.org/theory/orometry/article/Orometry_9.html As defined this way it is hard to compute automatically unless you have access to a DEM (digital elevation model) of the area to be considered. The definition here http://www.13ers.com/Info1.html or here http://www.bivouac.com/PgxPg.asp?PgxId=280/ is easier since it is the distance from a summit to the nearest higher summit.
It should be possible to do this relatively easily with MV data. From this it would be possible to create an isolation hierarchy. If you wanted to be really pedantic you would have to get into both using great circle (relatively easy) and defining your datum which raises some interesting issues. If say WGS84 is used then all the summits are over 50m higher in Ireland then the usual "above sea-level" which might make a difference to relative heights within Ireland and almost certainly would if you considered summits in the rest of Europe or the world.
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RECENT CONTRIBUTIONS 1 2 3 .. 19 Next page >>
Track
Suilven
Peter Walker 10 hours ago.
I first read about Suilven when I was about 11. It was in some British geographical gazetteer, a stern washed-out pict... walk, Len: 24.0km, Climb: 1029m, Area: Lochinver to Ullapool (Britain) Suilve

  
Summit Comment
Slieve Elva: Fantastic scenery
Damian120 14 hours ago.
A stunning walk going up over Slieve Elva that you can begin and end end at Fanore Beach. Some great locations along the Caher River to stop and relax and watch the water gently flowing downstream...

  
Track
Maumtrasna Plateau via Dirkbeg and Buckaun Spurs
Onzy a day ago.
Route to the Mauntrasna plateau using the Dirkbeg spur for ascent and the Buckaun for descent. walk, Len: 10.8km, Climb: 535m, Area: Maumtrasna North-East Top, Partry/Joyce C...

Forum: General
Lough Oular From Tonlagee
tomlug48 a day ago.
A beautiful July day on the summit of Tonlagee. Gazing down at the beautiful heart shaped Lough Oular.Tom Barragry & the Lugs .

  
Summit Comment
Knockannavea: Nice views to be had
csd a day ago.
While not very challenging, recent felling means the views along the way and from the summit are pleasant enough. A nice spot for a lunchtime walk.

  
Track
Picos de Europa
peter1 2 days ago.
I can say with certainty three things: the ascent was not 3266m, given the peak is only 2503m; secondly, I will be back walk, Len: 13.9km, Climb: 3266m, Area: Spain, Cantabria ()

Summit Summary
Knocknabro East Top: Drought made difficult ground trek possible
Collaborative entry Last edit by: CaminoPat 3 days ago.
Knocknabro East Top is best climbed as part of a good loop walk, taking in the West and North-East tops of Knocknabro. This summit is best reached firstly via Knocknabro West Top and then onto the...

  
Track
Sail Mhor
Peter Walker 4 days ago.
After a week of blazing sunshine in the Peak District overwhelmingly spent swimming in the pool, lazing by the pool a... walk, Len: 11.3km, Climb: 833m, Area: Sail Mhor, Loch Maree to Loch Broom (Bri

  
Summit Summary
Knocknabro North-East Top: NE Top Revealed
Collaborative entry Last edit by: CaminoPat 3 days ago.
This summit is best reached via Knocknabro West Top. Park at laneway to old farmhouse now in ruin at W15905 83498. Room for 1-2 cars to park. Climb gate at entrance and follow post and wire fence ...

Forum: General
.Lough Oular from Tonlagee
tomlug48 a day ago.
A beautiful July day on the summit of Tonlagee. Gazing down at the beautiful heart shaped Lough Oular.Tom Barragry & the Brothers of the Lug.

  
Track
Coastal Dublin - Donabate to Malahide
Onzy 4 days ago.
Circuit of Broadmeadows Estuary from Donabate to Malahide walk, Len: 12.9km, Climb: 115m, Area: Dublin Islands (Ireland)

  
Summit Comment
Knocknabro West Top: A Long Hard Slog
CaminoPat 3 days ago.
Park at laneway to old farmhouse now in ruin at W15905 83498. Room for 1-2 cars to park. Climb gate at entrance and follow post and wire fence heading north until W16029 84252. From there head acr...


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