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@Terry DownesHi Martin, . A little guidance on this would be great if you get 10 mins.
@Tony WHi Martin.
I bow to your superior knowledge.
Regards
Tony.
Hi Martin, could I possibly grab a copy of the box file and map/shape file if you still have them? I should be getting back into this over the next few days...@Terry Downes
Hi Terry,
I first loaded the tiled georeferenced map from the NLS. This is the 1897 map which doesn't include the main line to Bicester:
https://maps.nls.uk/geo/explore/#zoom=18.6&lat=51.71994&lon=-0.84410&layers=168&b=8
This established the correct scaling for 4mm/ft.
Unfortunately the later 1919 map is not avaiIable georeferenced, which makes scaling the NLS sheets tricky:
https://maps.nls.uk/view/104182820
So I made a screenshot from that, loaded it as a picture shape, set it temporarily transparent, and scaled it over the 1897 map until it matched exactly.
Then deleted the 1897 map.
That's the usual method to scale scanned maps where you don't have any scaling information for the scan. Find a map which you can scale, set the unknown one transparent, and align it over the first one. We can do that in a Zoom meeting if anyone is interested? Templot includes several options for the scaling origin to make it easy.
cheers,
Martin.