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Post details Post   (Contract pics)
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)
Those who keep a s.. by Onzy   (Show all posts)
Go to this webpage.. by tamjk   (Show all posts)


RECENT CONTRIBUTIONS 1 2 3 .. 18 Next page >>
Track
Feet in bog, eyes on planets.
simon3 2 hours ago.
RossnafinnaSince we brought up the number of islands we have to over 570, when looking for a shorter walk I take a lo... walk, Len: 1.7km, Climb: 65m, Area: Rossnafinna Island, Mayo Islands (Ireland)

  
Forum: Suggestions
Outage
simon3 19 hours ago.
Members - MountainViews failed yesterday 23rd June 2018 . The cause was a problem at our hosting company which was resolved in late afternoon.Let us know if the issue returns.

  
User profile
Fergalh
Fergalh 16 hours ago.
Hill walks and Way Marked Trails...

Track
Corraun Circuit
Onzy 18 hours ago.
Route taking in Corraun and its East top. Essentially a variation on Wicklore's track 1404, but without the lift on t... walk, Len: 10.8km, Climb: 604m, Area: Corraun Hill East Top, Achill/Corraun (I

  
Summit Summary
Rossnafinna Island: Small island with huge views.
Collaborative entry Last edit by: simon3 a day ago.
This island can be reached from the north at around F80097 03359 by a small but driveable bridge.There is one central path heading SE from the bridge. There are extensive turf cuttings on both sid...

  
Track
Crossing the Corraun Plateau
simon3 18 hours ago.
There were various other tracks before this one going onto the Corraun plateau but none crossing from one side to the ... walk, Len: 13.7km, Climb: 648m, Area: Corraun Hill, Achill/Corraun (Ireland)

Summit Comment
Knockbwee: Summit Revealed
CaminoPat 2 days ago.
From the south, parking available for only one car at W124 775. Proceed uphill from junction with local road in a NNW direction along a rough stone covered road until you come to a six bar field g...

  
Track
Mournes: Donard and Satellites
Onzy 18 hours ago.
Route to Donard from Bloody Bridge via Crossone taking in Millstone Mountain on the return. walk, Len: 10.6km, Climb: 871m, Area: Crossone, Mourne Mountains (Ireland) Cros...

  
Summit Summary
Crocknafarragh SE Top: Climb it, but include one or more "cousins"
Collaborative entry Last edit by: simon3 3 days ago.
The way to Crocknafarragh SE Top can follow the full route up to Crocknafarragh with an additional 700m walk out to the lesser top or, part of the way up, by contouring up and around the S flanks ...

Track
Croughan ridge by going around Lough Acorrymore
simon3 a day ago.
This is a relatively easy way to reach the Croughan ridgeline and get a taste for the magnificent all-round views. Ir... walk, Len: 7.8km, Climb: 595m, Area: Croaghaun SW Top, Achill/Corraun (Ireland

  
Summit Comment
Baurtregaum Far NE Top: Great views from a so-so mountain
Colin Murphy 4 days ago.
The view over Tralee Bay at low tide from Baurtregaum Far NE Top had the appearance of the Amazon River delta!

  
Summit Comment
Bunnacunneen South Top: Simple bag from nearby tops
Colin Murphy 4 days ago.
For approach see entry for Bunnacunneen SE Top. From that grassy summit it is just over 1km across a gently rising slope to the NW and the South Top's equally grassy summit, which has marvellous p...


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