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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.
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