Welcome to MountainViews
If you want to use the website often please enrol (quick and free) at top right.

General Whatever you want to say that doesn't fit under the comments about places or another forum.
Sort by >

More controls

<< Prev page 1 .. 288 289 290 291 292 293 .. 375 Next page >>
Post details Post   (Expand pics)
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.
I note that the de.. by Conor74   (Show all posts)
Having dispatched .. by CaptainVertigo   (Show all posts)
(Part One) Bond Sl.. by CaptainVertigo   (Show all posts)
Watched Bear Gryll.. by brenno   (Show all posts)
Tomorrow night (Tu.. by wicklore   (Show all posts)
Adrian, I was walk.. by JACKILL   (Show all posts)
Yes captain my cap.. by Bleck Cra   (Show all posts)
Captain Vertigo, t.. by ahendroff   (Show all posts)


RECENT CONTRIBUTIONS 1 2 3 .. 24 Next page >>
Summit Comment
Rostoohy Hill: Coastal Hill
sandman a day ago.
Parking where appropriate make your way the short distance along the foreshore to L9531390160 where ascent to the hill exists as shown in the photo. You will encounter a small stone drinking well ...

  
Forum: General
in yer pants ....
BleckCra a day ago.
I turn my attention to mountainviews.ie. So much for focus.I see that its English translation of Irish hill names remains - and in remaining, (for the Mountains of Mourne at least) .... , remains ...

  
Summit Comment
Gubacarrigan: Coastal Hill
sandman a day ago.
Your options for parking are numerous but a lay-by is located at L7648192513. It only takes a few minutes to reach the cliff edge and on to the summit but as evident from the tracts along the edge...

Forum: Suggestions
Change to Local 100
simon3 a day ago.
The Local 100 list and completing it is one of the most popular lists that MV has. It allows the time-poor to get out and do some interesting hillwalking but with minimal travel time. It encourage...

  
Summit Comment
Rosgalliv Hill: Coastal Hill
sandman a day ago.
For the Mountain View members who will be joining Liz50 for her walk on 7/10/17 why not get there a few minutes earlier in order to visit this small hill with its Megalithic Tomb . Parking is avai...

  
Track
Spanish Sierra Nevada: La Alcazaba
Onzy 2 days ago.
Route to La Alcazaba (3,369m). walk, Len: 16.6km, Climb: 1143m, Area: Unid, Unid ()

Track
Spanish Sierra Nevada: Mulahacen
Onzy 2 days ago.
Route to Mulahacen from Alto del Chorillo returning on a lower track to the west. Route takes in both Mulahacen I and I walk, Len: 12.7km, Climb: 782m, Area: Unid, Unid ()

  
Summit Comment
Rostoohy Hill: Coastal Hill
sandman a day ago.
The summit area with its hill fort and views across the bay.

  
Forum: General
Go easy on Gates
melohara 6 days ago.
Please be conscious of damage that may be caused to farm gates when climbing over them. I recently met a very friendly and hospitable farmer who welcomed my rambling over his hills despite him hav...

Track
Lanigans Ball and the Slieve Mish Mountains
GSheehy 2 days ago.
?What in the name of Jaysus are you on about with your ?Lanigan?s Ball??? ?This is hillwalking lad. Not danc walk, Len: 27.3km, Climb: 1557m, Area: Caherbla, Slieve Mish (Ireland) Caherb

  
Summit Comment
Claggan Hill: Coastal Hill
sandman a day ago.
Although the trig is clearly visible from where i parked for Roscahill a double fence lies in wait from there. Easy access is via the field gate located at L9409289344 with ample parking 50 meters...

  
Track
Le Taillon via la Brèche de Roland
David-Guenot 5 days ago.
walk, Len: 16.1km, Climb: 1013m, Area: France, Occitanie ()


RECENT CONTRIBUTIONS 1 2 3 .. 24 Next page >>