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Between
1857 and 1879 a scale of 1:500, or 10 foot to one mile,
was introduced for many urban areas. But in the 1870s
the Ordnance Survey stopped including interior walls of
buildings in its surveys, except for important public
buildings. Some other small features, such as flower beds
and isolated trees, also disappeared.
An Irish one inch series of maps was authorised in 1851
as a base map for geologists and the first such map appeared
four years later.
In 1863 the survey of Dublin County at 1:2500 was extended
to cover the whole county, published by parish. Then,
after much debate over many years, a resurvey of the entire
country at 1:2500 was authorised in 1887, based on the
same primary triangulations as the original 6 inch survey.
This survey, which was completed in 1913, comprised over
18,000 maps.
Taken together, these maps provide a unique, information
rich heritage. Safely captured in digital format by OSi
Historic Mapping, this archive is now preserved to inform
future as well as present generations. |
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