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|Single message by Martin Wynne Topic: Direct loading of background maps|
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Yes, but lat and lon are always measured in degrees, or radians, or some other angular measure.
Pixels are always specified as integers, you can't have half a pixel.
It's not important, these are simply symbols in the URL, they could be fish=23, chips=68, and it would still work.
In fact the old County Series 25" maps are not referenced to lat and lon at all, or even the OS National Grid which came later. Each County had its own map origin.
That's why it is a lot of work for the NLS to convert the individual sheet scans to a slippy map of the whole of Great Britain, georeferenced on the overlay to modern maps.
At present they have completed scanning the individual sheets for almost all of England and Wales, but the slippy map has got only as far as Crewe.
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