Who supplies Landmark historical mapping?

 

Ordnance Survey has one of the largest collections of historical mapping in Great Britain and until recently this was only held as a paper archive. As a result of a joint venture between Ordnance Survey and Landmark Information Group Ltd, an extensive collection of mapping from 1841 to 1996 has been created in digital form. This has been taken from Ordnance Survey’s historical archive of Town Plans, County Series and post-war National Grid Mapping.

Ordnance Survey large-scale mapping began with the first maps, covering individual counties, in September 1841. Each county was then revised between three and five times prior to 1945. These sheets became known as the County Series. Mapping was produced to the Cassini projection with each county surveyed separately, and often to different origins and projections, which meant that they did not match the neighbouring county. In 1944-45 the National Grid was adopted and the entire country’s mapping was transferred to the National Grid projection that we use today.

Scale and Sources:

The historical mapping was originally plotted at the following scales:

•County Series – 1:1,250, 1:2,500 & 1:10,560 Scale

•National Grid – 1:2,500, 1:10,000 & 1:10,560 Scale