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simon3
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.
I note that the de.. by Conor74   (Show all posts)


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Summit Comment
Corraun Hill: Views! what views?
Harry Goodman 7 hours ago.
Climbed this hill on Wed. 12 Oct 2011. Our intention was to start from Belfarsad Bridge but the blanket of thick mist covering the Plateau made me opt for the simpler climb from Burnanioo Bridge s...

  
Summit Summary
Corraun Hill: Western summit on plateau above big corrie lakes.
Collaborative entry Last edit by: simon3, Harry Goodman 7 hours ago.
(1) Bunannio Bridge Route: Start around L737 943. Take the well made track E up to a T junction L751 948, turn left and follow track to its end L749 950. Go NW up the hillside for some 1.2k over s...

  
Track
molls gap loop walk
strangeweaver a day ago.
From the car park at molls gap follow the narrow country lane down to the pass between to stumpa duloigh and Knocklome... walk, Len: 17.6km, Climb: 985m, Area: Dunkerron Mountains (Ireland) Knocklome

Summit Comment
Kilfarrasy Hill: What Lies Beneath is better than What Lies Up Top
Pepe a day ago.
You can drive over this. A very minor public road connects Kilfarassy with the R675 northeast of Annestown. This road crests the exact top of Kilfarassy Hill. A much better way of doing it is to p...

  
Track
Simple ascent of Minaun.
simon3 a day ago.
An easy way up starting from the carpark. walk, Len: 3.6km, Climb: 121m, Area: Minaun, Achill/Corraun (Ireland) Minaun

  
Summit Comment
Westtown Hill: The Folks Who Live on the Hill
Pepe a day ago.
Curiosity made me investigate Westown Hill, having blissfully passed within a hundred metres of its ‘summit’ many a time on walks, drives and cycles. The top lies up a tarmac road leading west off...

Track
Puglia: Circuit south of Otranto
Onzy 2 days ago.
walk, Len: 11.1km, Climb: 215m, Area: Italy, Apulia ()

  
Forum: General
Reviewers wanted.
simon3 2 days ago.
Interested in reviewing either of two new books?Mourne and Cooley Mountains is by Adrian HendroffThe Comeragh, Galtee, Knockmealdown and Slieve Bloom is from John G. O’Dwyer. Let us know at admin@...

  
Summit Summary
Slievenashaska South Top: Fine ridge peak amongst wild land and lakes.
Collaborative entry Last edit by: simon3 5 days ago.
This is normally done in conjunction with Coomcathcun, but may also be completed in isolation. Take the road to the NW of Sneem (following the Sneem River), turning left at point V672 698 and foll...

Track
Puglia: Trajan Way to Ostuni
Onzy 2 days ago.
walk, Len: 10.9km, Climb: 264m, Area: Italy, Apulia ()

  
Summit Summary
Buckoogh: Somewhat separated peak, great sea views, boggy top.
Collaborative entry Last edit by: simon3 5 days ago.
Currently the easiest route is from the SE. Park at the gate at G015 002 and follow the line of an old wall beside the forest up the hill. The route from the east starts by parking at G014 015 at ...

  
Forum: General
Morocco
spiider28 a week ago.
Thanks for the detailed advice @kernowclimber, really appreciate it


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