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  2. In 1995, Ordnance Survey launched its website and digitised the last of about 230,000 maps, making Britain the first country in the world to complete a programme of large-scale electronic mapping. Computers further transformed the map-making process, with electronic data becoming routinely available to customers within 24 hours of being surveyed.

  3. Ordnance Survey maps of Great Britain use the Ordnance Survey National Grid rather than latitude and longitude to indicate position. The Grid is known technically as OSGB36 (Ordnance Survey Great Britain 1936) and was introduced after the 1936–1953 retriangulation.

  4. Here you can find out how to buy our historical maps of Great Britain and where to find our archived maps, aerial photography and survey records of overseas British colonies. We define historical mapping as mapping that no longer reflects the situation on the ground.

  5. Jun 18, 2021 · On 18 April 1936, the trig pillar was first used in the retriangulation of Great Britain. On this day, a group of surveyors gathered around a white concrete pillar in a field in Cold Ashby and began the monumental task of mapping Great Britain.

  6. Jun 24, 2022 · On 21st June 1791, the Board of Ordnance bought a new and improved Ramsden theodolite to start to map out the entirety of Britain in light of the threat of French invasion. This was the day the Ordnance Survey was born.

    • When did Ordnance Survey maps come out?1
    • When did Ordnance Survey maps come out?2
    • When did Ordnance Survey maps come out?3
    • When did Ordnance Survey maps come out?4
    • When did Ordnance Survey maps come out?5
  7. Nov 6, 2018 · While 2018 marks 227 years since Ordnance Survey was founded on 21 June 1791, our first map was produced ten years later in 1801. Following a rebellion in 1745 in the Scottish Highlands, our origins were established in military strategy.

  8. Oct 14, 2018 · When World War One broke out, map-makers were posted overseas to replace existing French maps, which were too small in scale and imprecise.

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