Boards.ie uses cookies. By continuing to browse this site you are agreeing to our use of cookies. Click here to find out more x
Post Reply  
 
Thread Tools Search this Thread
17-02-2020, 09:49   #1
Popoutman
Troll Hunter.
 
Popoutman's Avatar
 
Join Date: May 2000
Posts: 1,253
Longest sightlines in Ireland?

Over the past few months, I've been interested in trying to find out what the longest sightline in Ireland is. That is, what's the farthest point that can be seen when standing at a location.

As far as I have been able to gather, the longest I can find that stays on the island of Ireland is that Caherconree near Camp, Kerry should be visible from Croaghaun, Achill at 199.6km.
Other interesting long sightlines are:
  • Galtymore to Croagh Patrick for 183.9km
  • Galtymore to Slieve Anierin NE of Drumshambo, Co. Cavan for 192.5km
  • Brandon to Slievemore on Achill for 197.8km

To get longer sightlines than 200km one would have to look over to the UK.[LIST][*]Errigal can see 202.9km to Ben More on the Isle of Mull.[*]Lugnaquilla can see 206.9km to a hill between Llyn Brianne and Claerwen Reservoir in central Wales. [*]But, the current max distance I could find was from Slieve Donard to a secondary 759m peak of Penygader, SW of Llyn Cau and not far from the Mach Loop, for a distance of 212.5km

I've been using the panorama generator at udeuschle.de for this exercise, as it gives a handy max-distance-viewable. Though I know the results may vary depending on refraction, it's been fairly accurate from what I've seen so far.

Personally, I've seen Nephin from the top of Keeper Hill for a distance of 158.3km on a lovely transparent day a few years ago (and got a crappy pic of it too).

Does anyone know of longer or better sightlines on or from Ireland?
Popoutman is offline  
(3) thanks from:
Advertisement
23-02-2020, 23:37   #2
Fathom
Moderator
 
Fathom's Avatar
Quote:
Originally Posted by Popoutman View Post
I've been using the panorama generator at udeuschle.de for this exercise, as it gives a handy max-distance-viewable. Though I know the results may vary depending on refraction, it's been fairly accurate from what I've seen so far.
Interesting app.
Fathom is offline  
28-02-2020, 16:52   #3
smacl
Moderator
 
smacl's Avatar
 
Join Date: Feb 2006
Posts: 13,646
Possibly useful table here giving distance to the horizon for different altitudes which by my reckoning would have the furthest point at sea you could see from Ireland at just over 112km but you could obviously have line of sight to an elevated point much further away (224km max for two points at 1km above sea level with not occlusion). I'd guess older (pre-GPS era) OS trig pillars might be worth looking as potentially long sight lines.

Seem to remember a line from An Beal Bocht where Bónapárt Ó Cúnasa reckons he could see Boston on a clear day from his house in Corca Dhorcha. Uisce beatha may have been taken.
smacl is offline  
(3) thanks from:
02-03-2020, 15:15   #4
tabbey
Registered User
 
Join Date: Feb 2015
Posts: 1,718
Quote:
Originally Posted by smacl View Post
Seem to remember a line from An Beal Bocht where Bónapárt Ó Cúnasa reckons he could see Boston on a clear day from his house in Corca Dhorcha. Uisce beatha may have been taken.
There are also a number of townlands called Boston, in Kildare, Laois and Tipperary, but unless he could bend his line of sight, they also would be invisible.
tabbey is offline  
29-06-2020, 19:04   #5
baaba maal
Registered User
 
Join Date: Apr 2010
Posts: 739
Great post OP
I can't better the distance, but I was in the Bricklieve Hills ( I refuse to call them mountains!) over the weekend and the view was spectacular- given their height, it was stunning. I'm forever squinting through my binoculars trying to find the very farthest things on the horizon and there was a lot to see. That link is to the filthiest, best map porn I have seen in quite a while- it suggests a point in the Slieve Blooms at 124km- not bad at all.
baaba maal is offline  
Advertisement
20-08-2020, 12:59   #6
dave 27
Registered User
 
Join Date: Jan 2010
Posts: 1,062
I climbed Mt Brandon a couple of years ago on an extremely sunny February! From the top way off in the distance i could see a long mountain range which even on the clear day was barely visible but i can only imagine it could have been the connemara mountains?

McGillycuddy reeks were to my right and not far away incase you think its that!
dave 27 is offline  
20-08-2020, 13:25   #7
Popoutman
Troll Hunter.
 
Popoutman's Avatar
 
Join Date: May 2000
Posts: 1,253
Here's the panorama for Mt Brandon looking north.
https://www.peakfinder.org/?lat=52.2...zoom=5&ele=923

Certainly possible to have seen the mountains in Connemara, I've seen them myself and I've seen the reverse as well.
Popoutman is offline  
Thanks from:
03-09-2020, 20:56   #8
josip
Registered User
 
Join Date: Jul 2008
Posts: 7,925
We're doing the county tops this year and it's very interesting seeing what county tops we can recognise from other county tops.
The longest we've seen so far has been Kippure - Galteemore at 153km

How reliable is the Peak Finder database ?
The height they have listed for Binn Bhán is way off.


Last edited by josip; 03-09-2020 at 23:40.
josip is offline  
07-09-2020, 09:24   #9
GetWithIt
Registered User
 
Join Date: Jan 2011
Posts: 1,858
This might be of interest http://hilltops.ie/brandon/
GetWithIt is offline  
Advertisement
07-09-2020, 13:32   #10
Popoutman
Troll Hunter.
 
Popoutman's Avatar
 
Join Date: May 2000
Posts: 1,253
I wonder which Benbaun it is highlighting.

In general I've found PeakFinder to be pretty accurate. It pulls a lot of data from OpenStreetMap, so it should be possible to edit and correct errors.
The DEM used is (iirc) from the Space Shuttle Topography mission, and some improvements from http://www.viewfinderpanoramas.org/

That hilltops.ie page is good but incredibly broken from a user usability point of view, which is unfortunate.

I still try and see if there are differing sightlines, and I do compare the sightlines seen with similar views from other online generators just to sanity check, and there's usually no issue, and I do make sure the underlying data is not the same.
Popoutman is offline  
Thanks from:
10-10-2020, 21:01   #11
The Woodcock
Registered User
 
Join Date: Aug 2012
Posts: 82
This is a fascinating topic.
I grew up near the Devil's Bit in Tipperary and even though it's far from the highest mountain in the county, the views are great. We were always told growing up that you could see nine counties from the summit(Tipp, Offaly, Laois, Kilkenny, Waterford, Cork, Limerick, Clare and Galway), but I later realised that in fact you can see Mount Leinster on the Carlow/Wexford border as well as the Wicklow Mountains. I've also been told that you can see Cairn Hill north of Longford town.

I've seen the top of Mount Brandon from Dún Ducathair on Inis Mór on a wonderfully clear spring day. Unfortunately when I got to the summit of Brandon years later visibility was down to about 20 metres.

For anyone familiar with QGIS, there is a visibility analysis plugin that may be of use when combined with NASA SRTM rasters.
The Woodcock is offline  
(2) thanks from:
Post Reply

Quick Reply
Message:
Remove Text Formatting
Bold
Italic
Underline

Insert Image
Wrap [QUOTE] tags around selected text
 
Decrease Size
Increase Size
Please sign up or log in to join the discussion

Thread Tools Search this Thread
Search this Thread:

Advanced Search



Share Tweet