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... http://www.meg.. by Moac   (Show all posts)
Simon's comments i.. by pdtempan   (Show all posts)
2009-04-02 14:55:29
Re Checking or calculating altitude and ascen
My short answer would be to find height gain: use the contours with a bit of guesstimating for where the start or end of a climb is between them.

You may point out that this does not include minor ups and downs that don't appear in the contours or even the height gain and loss going over peat hags etc. You may ask why not use the GPS figure for accumulated height gain.

This then brings us to the long answer. As far as I can see there is no right way of doing this. If you use a GPS it constantly calculates height around about every 2 seconds. These height estimations have an inherent error in them (around 1.4 times as great as horizontal error) which is constantly changing. As far as I can see these random errors make it look like your accumulated height gain is rising so the figure given by a GPS always seems to be more (as in around 30% more) than that given by looking at contours. The GPS may well be recording extra height gain resulting from rough ground, but the signal is probably lost in the noise from random error. Like a coastline or any fractal, the complexity and the height gain expands as you increase the detail.

Surely this can be fixed by a GPS with a pressure based height sensor? Not in my experience. Minor variations of the almost omnipresent wind as you move around cause fluctuations just as bad as the GPS radio based system.

There are various ways of mitigating readings from a GPS tracklog. GPSU software has a filter which smoothes small variations for example. However the only "Modern Navigation" tool in Ireland that seems to give a figure consistently similar to what you would expect from reading contours off the map is OSI Trailmaster which presumably is calculating the height gain by using its in-built DEM (digital elevation model) which tells it how high every point is.

That's what I tend to use now when it is available.
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RECENT CONTRIBUTIONS 1 2 3 .. 14 Next page >>
Summit Comment
Mothaillín: Fabulous views to the west from the summit.
hivisibility 9 hours ago.
Fine view towards Broghnabinnia and Caher from Mothillín summit.

Ott Mountain to Slieve Meelmore
Aidy 9 hours ago.
Started at the Ott/Blue Quarry car park on the Moyad Road, and took a route taking in six summits, going over Ott Mou... walk, Len: 10.9km, Climb: 730m, Area: Ott Mountain, Mourne Mountains (Ireland)

Summit Comment
Mothaillín: Summit area as seen from Crossderry.
hivisibility 9 hours ago.
Mothillín summit from Crossderry.

Summit Comment
Crossderry: Towards Knocknabreeda and Stumoa Dúloigh
hivisibility 9 hours ago.
The view towards Knocknabreeda fro Crossderry summit. Stumpa Dúloigh in the background. Knocknabreeda summit is located over to the far left of the ridge.

Glenbeigh to Galway's Bridge
GSheehy 18 hours ago.
I?m putting this one up because it was a club walk and I was thinking about the other day. There aren?t too many clu walk, Len: 40.5km, Climb: 917m, Area: Glenbeigh Horseshoe (Ireland)

Forum: General
Cable Car to the Hellfire Club - 20/10
cave-dweller 2 days ago.
Hello, There is a meeting being held in the Yellow House Pub in Rathfarnham in Dublin 14 tomorrow night at 8 pm about some proposed "redevelopments" in and around the Hellfire Club/Montpelier Hill...

Summit Comment
Crossderry: Summit looking East.
hivisibility 9 hours ago.
Summit of Crossderry with view back towards Mothillín.There are 2 similar heights at the summit area. The summit is the one nearest the Eastern Reeks.

Peak bagging in The Sperrins in autumn
peter1 a day ago.
Again, the use of a mountain bike is highly recommended for this route, if you are a solo walker. I left my bike in a... walk, Len: 16.2km, Climb: 1048m, Area: Mullaghclogha, Sperrin Mountains (Irela

Summit Comment
Stumpa Dúloigh SE Top: Fine views to the East...
hivisibility 9 hours ago.
The view to Knocknabreeda, Crossderry and Mothillín as seen from the aooroach to Stúmpa Dúloigh SE Top. Torc in the centre with Mangerton rising over to the right.

Summit Comment
Knocknabreeda: View of Carrauntoohil from the summit.
hivisibility 9 hours ago.
Carrauntoohil from Knocknabreeda summit.

Forum: General
Quad bikers in the Mournes
mcrtchly 2 weeks ago.
Whilst out in the Mournes on Sunday 2nd Oct, at about 8.30am we were shocked to see a group of half a dozen quad bikers powering up the track from the Banns Road towards Lough Shannagh (below Doan...

Slieve Foye
Onzy 6 days ago.
Sunday route over Slieve Foye and along the ridge for a bit... walk, Len: 9.9km, Climb: 439m, Area: Slieve Foye, Cooley/Gullion (Ireland) Slie...

RECENT CONTRIBUTIONS 1 2 3 .. 14 Next page >>