The retriangulation of Great Britain was a triangulation project carried out between 1935 and 1962 that sought to improve the accuracy of maps made of Great Britain. Data gathered from the retriangulation replaced data gathered during the Principal Triangulation of Great Britain, which had been performed between 1783 and 1851. The retriangulation involved erecting around 6,500 concrete pillars (known as trig points) on British hilltops, which were used as reference points for the triangulation. Today, use of the trig points and the results of the retriangulation have been replaced by a network of global navigation satellite system stations known as OS Net, which is able to achieve an accuracy of 3 millimetres (0.12 in) over the length of the country compared to 20 metres (66 ft) achievable

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  • The retriangulation of Great Britain was a triangulation project carried out between 1935 and 1962 that sought to improve the accuracy of maps made of Great Britain. Data gathered from the retriangulation replaced data gathered during the Principal Triangulation of Great Britain, which had been performed between 1783 and 1851. The retriangulation involved erecting around 6,500 concrete pillars (known as trig points) on British hilltops, which were used as reference points for the triangulation. Today, use of the trig points and the results of the retriangulation have been replaced by a network of global navigation satellite system stations known as OS Net, which is able to achieve an accuracy of 3 millimetres (0.12 in) over the length of the country compared to 20 metres (66 ft) achievable by use of the trig points. (en)
  • The retriangulation of Great Britain was a triangulation project carried out between 1935 and 1962 that sought to improve the accuracy of maps made of Great Britain. Data gathered from the retriangulation replaced data gathered during the Principal Triangulation of Great Britain, which had been performed between 1783 and 1851. The retriangulation involved erecting around 6,500 concrete pillars, the majority on hilltops, which were used as reference points (trig points) for the survey. The pillars fell out of use from the 1980s onwards, being replaced by the network of global navigation satellite system stations known as OS Net. (en)
  • The retriangulation of Great Britain was a triangulation project carried out between 1935 and 1962 that sought to improve the accuracy of maps made of Great Britain. Data gathered from the retriangulation replaced data gathered during the Principal Triangulation of Great Britain, which had been performed between 1783 and 1851. (en)
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  • The retriangulation of Great Britain was a triangulation project carried out between 1935 and 1962 that sought to improve the accuracy of maps made of Great Britain. Data gathered from the retriangulation replaced data gathered during the Principal Triangulation of Great Britain, which had been performed between 1783 and 1851. The retriangulation involved erecting around 6,500 concrete pillars (known as trig points) on British hilltops, which were used as reference points for the triangulation. Today, use of the trig points and the results of the retriangulation have been replaced by a network of global navigation satellite system stations known as OS Net, which is able to achieve an accuracy of 3 millimetres (0.12 in) over the length of the country compared to 20 metres (66 ft) achievable (en)
  • The retriangulation of Great Britain was a triangulation project carried out between 1935 and 1962 that sought to improve the accuracy of maps made of Great Britain. Data gathered from the retriangulation replaced data gathered during the Principal Triangulation of Great Britain, which had been performed between 1783 and 1851. The retriangulation involved erecting around 6,500 concrete pillars, the majority on hilltops, which were used as reference points (trig points) for the survey. The pillars fell out of use from the 1980s onwards, being replaced by the network of global navigation satellite system stations known as OS Net. (en)
  • The retriangulation of Great Britain was a triangulation project carried out between 1935 and 1962 that sought to improve the accuracy of maps made of Great Britain. Data gathered from the retriangulation replaced data gathered during the Principal Triangulation of Great Britain, which had been performed between 1783 and 1851. (en)
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  • Retriangulation of Great Britain (en)
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