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It would be almost.. by mcrtchly   (Show all posts)
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)


RECENT CONTRIBUTIONS 1 2 3 .. 22 Next page >>
Forum: General
MOUNTAINVIEWS MEMBERS MEET SEPTEMBER 2018
liz50 20 hours ago.
Traverse of Brandon Ridge is scheduled for Saturday 8th September. The walk from the Connor Pass to Brandon Creek is around 18km with 1300m ascent taking around 7 hours. There is a slightly shorte...

  
Track
Burrane Upper
conormcbandon a day ago.
walk, Len: 0.8km, Climb: 43m, Area: Burrane Upper, Clare Coastal Hill (Ireland)...

  
Summit Comment
Knockakishaun: Bunowen River can present problems
markwallace a day ago.
Parked at a layby further up the valley from the crossing point mentioned in James Sheerin's comment to do a circuit of Laghta Eighter and Knockakishaun. Access to Laghta Eighter was easy from hig...

Track
Kilmore
conormcbandon a day ago.
walk, Len: 1.0km, Climb: 26m, Area: Kilmore, Clare Coastal Hill (Ireland) Kilmo...

  
Summit Comment
Crocknafarragh: The High Route around Glentornan Lough
jsramsey1491 2 days ago.
Last Thursday (16/08/2018) a few friends and I decided to do a recce of a walk around Glentornan Lough. We started close to the Gaelic pitch on the southwestern shore of Lough Nacung Upper, passed...

  
Summit Comment
An Bhinn Bhuí: Benwee Head Loop.
sandman 3 days ago.
As already stated Benwee Head has some of the most dramatic costal scenery in Ireland and with this in mind i decided to enjoy on a clear sunny day the joys of walking the 12.4km of the Benwee Hea...

Track
Oileán an Bhromaigh
conormcbandon a day ago.
walk, Len: 1.1km, Climb: 21m, Area: Oile?n an Bhromaigh, Galway Islands (Irelan...

  
Summit Comment
Knocknanacree: Storm Beach and Cliffs at lower western reaches
Bunsen7 3 days ago.
A view of "Acres" from Minard Beach. This is apparently a geologically interesting spot in itself as it is a storm beach comprised of large sandstone boulders. The castle is on private land and no...

  
Track
Cnoc Mordain
conormcbandon a day ago.
walk, Len: 10.0km, Climb: 457m, Area: Cnoc Mord?in, South Connemara (Ireland) C...

Summit Comment
Knockafeehane: From the horse's mouth
Bunsen7 3 days ago.
This is the trail description post at Q59652 00497. It summarises the route if taken from east to west, as per track 3881.Vastly superior to my own garbled efforts!Annascaul obviously is a very we...

  
Track
Barraderry
conormcbandon a day ago.
walk, Len: 1.2km, Climb: 40m, Area: Barraderry, Galway Coastal Hill (Ireland) B...

  
Summit Comment
Knockafeehane: Easily Accessible and not overly demanding
Bunsen7 3 days ago.
There is a waymarked trail to the summit which loops over the ridge leading west from this hill. See track 3881.The quickest route to the top would see you park in Annascaul village and walk up th...


RECENT CONTRIBUTIONS 1 2 3 .. 22 Next page >>