Levelling
of Great Britain
[1GL, 2GL Transcription]
[FBM List]
|
Ordnance Survey's Levelling of Great Britain |
[1GL, 2GL Abstract] [1GL, 2GL Transcription] |
[Timeline] [FBM List] |
|
| [assume Great Britain unless specifed] |
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| Principal Triangulation (published in 1858) |
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| (World War One) |
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| Retriangulation of Great Britain (published 1967) (+) |
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| (2nd World War) |
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| Readjustment of the Triangulation |
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| Further Triangulation |
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| GPS era |
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Sources used on this page
Ordnance Survay Maps a descriptive manual - J B Harley
[www.osni.gov.uk]