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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)
The Tasermiut rang.. by kernowclimber   (Show all posts)


RECENT CONTRIBUTIONS 1 2 3 .. 18 Next page >>
Track
BRANDON HILL - THE QUICK WAY
David-Guenot 13 hours ago.
A steep but quick ascent along the forestry on rocky terrain, along what I believe has been dug as a firebreak rather ... walk, Len: 5.0km, Climb: 305m, Area: Brandon Hill, South Midlands (Ireland) B

  
Summit Comment
Carrickarede: Island.
sandman a day ago.
Carrickarede island is connected to the mainland by the world famous Carrick-a-Rede rope bridge. One of Northern Ireland's top tourist attractions it is operated by the National Trust but unfortun...

  
Summit Comment
Inishmeane: The concrete road thru the village
magicstep a day ago.
Part of the village, about 10 houses in total.

Track
BLACKSTAIRS CHALLENGE 2017 - A PEAK-BAGGER'S ROUTE
David-Guenot 15 hours ago.
walk, Len: 34.1km, Climb: 1629m, Area: Black Rock Mountain, Blackstairs Mountai...

  
Summit Comment
Inishmeane: Not much to do, a tranquil place.
magicstep a day ago.
Visited in 2014. There's a sandy beach and a solid pier with slipway and a picnic table facing the mainland. The road from the pier all the way thru the village is a robust concrete one, but it's ...

  
Summit Comment
Inishsirrer: Deserted village
magicstep 2 days ago.
Mainland on the horizon (left and right)

Track
THE LONG WAY UP LUG
David-Guenot 15 hours ago.
walk, Len: 21.0km, Climb: 980m, Area: Cloghernagh, Dublin/Wicklow (Ireland) Clo...

  
Summit Comment
Inishsirrer: The only building that is not a ruin.
magicstep 2 days ago.
Surprisingly Donegal islands have a very good mobile internet reception, sometimes better than in an office in Dublin.

  
User profile
ewen
ewen 3 days ago.
Now living furth of Scotland and getting to know the Irish hills. If you come across a Scottish hill Walker with dodgy knees and walking sedately, stop and say hello.

Summit Comment
Inishsirrer: Part of a road from the past
magicstep 2 days ago.
There's a salty tidal lake on the island.

  
Track
CAMADERRY + TONELAGEE + BROCKAGH
David-Guenot 15 hours ago.
walk, Len: 27.6km, Climb: 1295m, Area: Camaderry South East Top, Dublin/Wicklow...

  
Summit Comment
Inishsirrer: Uninhabited except a few sheep.
magicstep 2 days ago.
I did kayak to the island in 2014. There is a slipway facing the mainland. Lot's of ruined houses. Walking is decent as the island is flat but in places ground is uneven and overgrown, there are o...


RECENT CONTRIBUTIONS 1 2 3 .. 18 Next page >>