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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)
Those who keep a s.. by Onzy   (Show all posts)
Go to this webpage.. by tamjk   (Show all posts)
In reply to a rece.. by mcrtchly   (Show all posts)


RECENT CONTRIBUTIONS 1 2 3 .. 24 Next page >>
Track
A Horseshoe of Epic Proportions
GSheehy less than an hour ago.
There?s an owl on the road as I make my way to Cloghane. Never seen that before. Just standing there, looking at the o walk, Len: 38.1km, Climb: 1866m, Area: Brandon Group (Ireland) An Bhinn Dubh,

  
Track
Corrin Hill (105)
mlmoroneybb 3 hours ago.
walk, Len: 2.0km, Climb: 59m, Area: Corrin, Nagles Mountains (Ireland) Corrin

  
Forum: General
Illuminating Discovery
Bunsen7 3 hours ago.
https://www.rte.ie/news/munster/2017/0925/907390-megalithic/"A hillwalker in west Kerry has made a stunning discovery which connects a 4,000-year-old tomb with the equinox.The megalithic tomb, kno...

Track
Cuipidstown Hill
mlmoroneybb 4 hours ago.
Very easy walk with Deirdre O'Sullivan Rafter, Sarah Ryan, Helen Gleeson walk, Len: 1.4km, Climb: 334m, Area: Cupidstown Hill, Dublin/Wicklow (Ireland) ...

  
Track
Half Galtee Crossing - Anglesborough to Cush and back
conrad1179 11 hours ago.
run, Len: 26.8km, Climb: 1845m, Area: Lyracappul, Galty Mountains (Ireland) Lyr...

  
Forum: General
"Very like a Whale"
BleckCra 15 hours ago.
The temptation for me Simon, as of course you know, to be drawn into a debate with you, is virtually irresistible but fortunately only virtually.Much in your post has little to dislike but far fro...

Summit Comment
Barranisky: Barniskea or Barniskey
Barry 3 days ago.
Might be worth adding that Ballymoyle Hill might be more appropriate name for this height. Called that in Coillte records. Whilst Barranisky is spelt thus on OS six inch maps, note that Hall Nevil...

  
Forum: General
The perpetual anti
simon3 a day ago.
Ah BleckCra we do miss your commentary expressed as always eloquently and amusingly. You have excelled yourself in double entendre with regards to Slieve Meelmore on this occasion. We thank you fo...

  
Summit Comment
Gubacarrigan: Coastal Hill
sandman a week 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...

Summit Comment
Westaston Hill: The top?
Barry 3 days ago.
I think the highest point is likely about 175 metres in a WSW direction from the mast. I'm judging this from aerial photography and DTM which shows a rocky outcrop in a small forest clearing. DTM ...

  
Track
Pic d'Anie
David-Guenot 3 days ago.
walk, Len: 16.0km, Climb: 1027m, Area: France, Nouvelle-Aquitaine ()

  
Track
Wild SE Inishmore
simon3 3 days ago.
This is a walk around the SE corner of Inishmore. The weather wasn't great so the photography was a bit limited due to d walk, Len: 12.8km, Climb: 161m, Area: Oile?in ?rann (Ireland)


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