MountainViews
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 .. 37 38 39 40 41 42 .. 393 Next page >>
Post details Post   (Contract pics)
You may well adjud.. by tamjk   (Show all posts)
Hi TamThank you fo.. by Peter Walker   (Show all posts)
Most of the techni.. by aidand   (Show all posts)
Morning, Mr Walker.. by tamjk   (Show all posts)
Hi TamI don't know.. by Peter Walker   (Show all posts)
Wicklore,I realise.. by tamjk   (Show all posts)
mcrtchly
2015-09-02 16:09:01
OSI public viewer and 1:25,000 maps
In reply to Tamjk's recent post about OSI maps, I can make the following observations:

The depiction of scale of digital maps on a computer screen depends upon the 'zoom' level and the pitch (pixel size) of the screen. For example looking at Mullaghanattin on the OSI public viewer at third zoom level (reported at 1:10,000 by the OSI website) gives images which are different sizes on different displays. On my LCD desktop monitor which has 47 pixel per cm (ppcm) I measure the distance between the summit of Mullaghanattin and the 700m contour to be 2.5cm, whilst on my tablet (62 ppcm) the distance is 1.3cm. Clearly a monitor with a higher density of pixels per cm will show a smaller scale image than that with a smaller ppcm. Web sites often quote the scale of a map based upon a nominal pixel density of with 72dpi (28ppcm) or 96dpi (38ppcm). If you want an accurate scale of the displayed map on a website you need to know the dpi/dppcm chosen by the web programmer for the map and you need to use a monitor with exactly the same dpi/ppcm. So just to reiterate THE SCALE QUOTED BY A WEBMAP IS UNLIKELY TO BE CORRECT

I think Wicklore has answered your misconception about the 1:25,000 mapping. I have the Reeks map in front of me here and I can assure you that Mullaghanattin is on the map. Concerning National coverage at 1:25,000 I suggest that you take this up with OSI, but I doubt that it would be economic to issue paper maps at this scale for the whole country. Anyhow, much more accurate digital map data (to building level) is available for the whole country from OSI which can be brought by any user.

Finally, I am disappointed by your use of the term 'Sirrah' when addressing someone who is a professional mapper with over 35 years experience in paper and digital mapping - perhaps you can explain your reasoning for implying that you have some sort of intellectual superiority.
Addressing someone.. by kernowclimber   (Show all posts)
Hi tamjk. In your .. by wicklore   (Show all posts)
** The OSI public .. by tamjk   (Show all posts)


RECENT CONTRIBUTIONS 1 2 3 .. 23 Next page >>
Summit Comment
Mangerton North Top: On the way to Mangerton
MountainHunter a day ago.
I started at Point A car park and followed the path. At about 520m (-9.4817 51.9882) the path swings westward, as you walk along the path, the coum for the Devil's Punchbowl comes into view. After...

  
Summit Comment
Slieve Bawn: No longer a drive-up
TommyMc a day ago.
A series of new road barriers means that it's no longer possible to drive further than the car park on the Strokestown side. A very pleasant walk uphill from the car park to the summit and back to...

  
Summit Comment
Knockalongy South-West Top: Choose your highest point
madfrankie a day ago.
Whichever turfy outcrop is the highest point now may not be in 10 years time.

Summit Comment
Knockalongy South-West Top: Beware of the barrier
madfrankie a day ago.
We followed sandman's route to the summit which is probably the best way to explore Knockalongy and its satellites. Gentle gradients but many eroded peat hags. Worth noting that the forest barrier...

  
Track
Carrauntoohil via the 'Back Ladder' from the Bridia Valley
peter1 3 days ago.
Park at a small turning place, just opposite The Stepping Stone / Cooky Monsters accommodation and cafe.The route fol... walk, Len: 11.5km, Climb: 1097m, Area: Carrauntoohil, MacGillycuddy's Reeks (I

  
Summit Comment
Binn Bhriocáin: Long views of a stepped descent.
simon3 4 days ago.
Letterbreckaun can be seen from Clare island, around 33km away. It appears between Mweelrea and the high ground towards the Sheefrys.

Track
Kate's to John's - Na Sléibhte Club Walk
GSheehy 2 days ago.
When we set up the club we said it was all about the economics of supply and demand - if we supplied challenging walk... walk, Len: 24.9km, Climb: 2015m, Area: Tomies North Top, Purple Mountain (Irel

  
Summit Comment
Mweelrea: Coastal mountains
simon3 4 days ago.
Ben Bury and Mweelrea form an impressive sight from Clare Island.

  
Track
Croghan Kinsella & Tops
Peter Walker 3 days ago.
walk, Len: 9.6km, Climb: 411m, Area: Croghan Kinsella, Dublin/Wicklow (Ireland)...

Summit Comment
Caherbarnagh East Top: An unremarkable summit, worth the visit for the views.
David-Guenot a week ago.
The summit is unremarkable though easy to spot as it lies along the fence.

  
Track
Corrigasleggaun and Slieve Maan
Peter Walker 3 days ago.
walk, Len: 17.8km, Climb: 541m, Area: Dublin/Wicklow (Ireland) Corrigasleggaun,...

  
Summit Comment
Caherbarnagh East Top: An easy stroll from Caherbarnagh.
David-Guenot a week ago.
There is a gate to cross when coming down from the cairn at the NE end of the main Caherbarnagh ridge (I found it was actually easier to cross the fence just right of the gate). There is a faint t...


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