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- Q20990859 subject Q8703118.
- Q20990859 subject Q8826767.
- Q20990859 abstract "The Anglo-French Survey (1784–1790) refers to the survey to measure the relative situation of Greenwich Observatory and the Paris Observatory. The English operations, executed by William Roy, consisted of the measurements of bases at Hounslow Heath (1784) and Romney Marsh (1787), the measurements of the angles of the triangles (1787–1788) and finally the calculation of all the triangles (1788-1790). The survey is very significant as the first precise survey within Britain, and the forerunner of the work of the Ordnance Survey which was founded in 1791, one year after Roy's death.".
- Q20990859 thumbnail General_Roys_Baseline.jpg?width=300.
- Q20990859 wikiPageExternalLink hs03_01_insley_2838.pdf.
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- Q20990859 wikiPageExternalLink www.fig.net.
- Q20990859 wikiPageExternalLink index.html.
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- Q20990859 wikiPageWikiLink Q8703118.
- Q20990859 wikiPageWikiLink Q8826767.
- Q20990859 wikiPageWikiLink Q898660.
- Q20990859 comment "The Anglo-French Survey (1784–1790) refers to the survey to measure the relative situation of Greenwich Observatory and the Paris Observatory. The English operations, executed by William Roy, consisted of the measurements of bases at Hounslow Heath (1784) and Romney Marsh (1787), the measurements of the angles of the triangles (1787–1788) and finally the calculation of all the triangles (1788-1790).".
- Q20990859 label "Anglo-French Survey (1784–1790)".
- Q20990859 depiction General_Roys_Baseline.jpg.