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Simon's comments i.. by pdtempan   (Show all posts)
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.
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RECENT CONTRIBUTIONS 1 2 3 .. 23 Next page >>
Track
Quick up and down Knockakishaun
markwallace 6 hours ago.
Starts from layby opposite a house about 1km before the road crosses the bridge over the Bunowen River.Short traverse ... walk, Len: 4.4km, Climb: 308m, Area: Knockakishaun, Croagh Patrick (Ireland)

  
Forum: General
MOUNTAINVIEWS MEMBERS MEET SEPTEMBER 2018
liz50 a day ago.
Traverse of Brandon Ridge is scheduled for Saturday 8th September. The walk from the Connor Pass to Brandon Creek is around 18km with 1300m ascent taking around 7 hours. There is a slightly shorte...

  
Track
Near Slievanea, Central Dingle (Ireland)
simon3 19 hours ago.
Important note. The end of this route is at Ballyduff Graveyard around Q54076 10104. We no longer recommend finishing ... walk, Len: 16.5km, Climb: 849m, Area: Slievanea, Central Dingle (Ireland) Sli

Summit Comment
Crocknafarragh: The High Route around Glentornan Lough
jsramsey1491 3 days ago.
Last Thursday (16/08/2018) a few friends and I decided to do a recce of a walk around Glentornan Lough. We started close to the Gaelic pitch on the southwestern shore of Lough Nacung Upper, passed...

  
Summit Comment
Knockakishaun: Bunowen River can present problems
markwallace 2 days ago.
Parked at a layby further up the valley from the crossing point mentioned in James Sheerin's comment to do a circuit of Laghta Eighter and Knockakishaun. Access to Laghta Eighter was easy from hig...

  
Summit Comment
An Bhinn Bhuí: Benwee Head Loop.
sandman 4 days ago.
As already stated Benwee Head has some of the most dramatic costal scenery in Ireland and with this in mind i decided to enjoy on a clear sunny day the joys of walking the 12.4km of the Benwee Hea...

Track
Burrane Upper
conormcbandon 2 days ago.
walk, Len: 0.8km, Climb: 43m, Area: Burrane Upper, Clare Coastal Hill (Ireland)...

  
Summit Comment
Knocknanacree: Storm Beach and Cliffs at lower western reaches
Bunsen7 4 days ago.
A view of "Acres" from Minard Beach. This is apparently a geologically interesting spot in itself as it is a storm beach comprised of large sandstone boulders. The castle is on private land and no...

  
Track
Kilmore
conormcbandon 2 days ago.
walk, Len: 1.0km, Climb: 26m, Area: Kilmore, Clare Coastal Hill (Ireland) Kilmo...

Summit Comment
Knockafeehane: From the horse's mouth
Bunsen7 4 days ago.
This is the trail description post at Q59652 00497. It summarises the route if taken from east to west, as per track 3881.Vastly superior to my own garbled efforts!Annascaul obviously is a very we...

  
Track
Oileán an Bhromaigh
conormcbandon 2 days ago.
walk, Len: 1.1km, Climb: 21m, Area: Oile?n an Bhromaigh, Galway Islands (Irelan...

  
Summit Comment
Knockafeehane: Easily Accessible and not overly demanding
Bunsen7 4 days ago.
There is a waymarked trail to the summit which loops over the ridge leading west from this hill. See track 3881.The quickest route to the top would see you park in Annascaul village and walk up th...


RECENT CONTRIBUTIONS 1 2 3 .. 23 Next page >>