Scanning OS UK maps

[lewisner]

Hi everybody and HNY! I have a little question; when I started building my Sunderland route in late 2004 I acquired a lot of scans of 25 inch to the mile Ordnance Survey maps from my local library. Fast forward to 2013 and I have learned how to paste Google Maps to basemaps. I did a little work on my calculator and found that if I scanned one of these maps with an 11.3 inch length to a 720 metre square basemap it should work out perfectly. However, when the map appears on the basemap where the tracks cross diagonally they resolve into a series of triangles and the resolution is useless. I have tried scanning at 1200 DPI and at 150 DPI but nothing works. Am I missing something?

 

[davidbird]

... a lot of scans of 25 inch to the mile Ordnance Survey maps from my local library. ... if I scanned one of these maps with an 11.3 inch length to a 720 metre square basemap it should work out perfectly...

From this, do you mean you now have paper copies that you are scanning yourself?

At the risk of sounding predictable, have you tried TransDEM? Very useful for prototype routes...

 

[lewisner]

Yes, the libraries have the originals, I paid to scan them onto paper, then I have tried scanning them and pasting them to a baseboard. I already have the DEM maps as part of the ECML route but the OS maps have very detailed and accurate track layouts.

 

[davidbird]

Even if you already have DEM maps, TransDEM can create another set of 1km tiles from the detailed maps, which you can manually add into a pre-existing route. You can add these at a resolution of 4096 pixels for a 1km square, which should be enough. I think that works out at 262 pixels per inch on your scans...