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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)
Having dispatched .. by CaptainVertigo   (Show all posts)


RECENT CONTRIBUTIONS 1 2 3 .. 15 Next page >>
Track
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CaptainVertigo 3 hours ago.
walk, Len: 27.1km, Climb: 1095m, Area: Coomataggart, Shehy/Knockboy (Ireland) C...

  
Track
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simon3 6 hours ago.
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Summit Comment
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Corkonian 20 hours ago.
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Forum: General
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40Shades a day ago.
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Summit Comment
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Corkonian 20 hours ago.
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Summit Comment
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eamonoc a day ago.
On 20/4/2017, at 07.4am drove to L 65405 59318, at area noted as Tievegariff on OS sheet 37. Parked opposite old abandoned cottage, went through gate and onto a well made farm tack uphill to two o...

Track
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Peter Walker 2 days ago.
(We did start from the Mamore Gap road). Slievekeeragh Hill from the roadSlievekeeragh Hill is an outlier of Raghtin M... walk, Len: 7.4km, Climb: 238m, Area: Slievekeeragh Hill, Inishowen (Ireland)

  
Summit Comment
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Aidy 3 days ago.
In my main summit comment I mentioned the steep northern sides of both Crocknasleigh and Gortnalughuge that I had descended to get to the Murder Hole at Boyeeghter Bay for sunset. This photo shows...

  
Track
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Bunsen7 6 days ago.
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Summit Comment
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Forum: General
GPS Device Found
GSheehy 2 weeks ago.
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Summit Comment
Knockalla: Try To Walk The Whole Ridge
Aidy 3 days ago.
I started at C247 336 and followed the good quality track up to the loughs in the centre of the ridge, then headed south west to the summit. The views there are stunning, taking in the sea channel...


RECENT CONTRIBUTIONS 1 2 3 .. 15 Next page >>