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29 Cards in this Set
- Front
- Back
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The Ordnance Survey
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Founded in 1791
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Ordnance Survey Act 1841 was established as |
modern authority on survey and map production for GB |
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Demand for new scales |
Irish survey @ 1:10,560 (6 inches to one mile) – land tax 1824 6 inch survey introduced for GB in 1840 Inadequate for all purposes |
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Deciding the ‘basic’ scale for the country was a |
A 20 year debate |
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Final decision 1858: |
1;2,500 for cultivated areas 1:10,560 for uncultivated areas 1;500 (10ft to the mile) towns > 4,000 people 1:63,360 and smaller (1 inch to the mile) to be derived |
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Late nineteenth century influences |
Photography Zincography (replaced expensive limestone lithography) Colour printing Machine stamping Reduction of cost – 1:500 abandoned Changing user demand |
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In 1892 there were two reviews of mapping in the UK: |
The Dorington Committee, which looked at Ordnance Survey and Committee on a Military Map of the United Kingdom |
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In 1892 Ordnance Survey 1 inch maps were still
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monchrome and hachuredor monochrome with contours - unsuitable for army
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The committee established that the existing Ordnance Survey maps were unsuited military requirements
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as they showed too much detail of no military importance.
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The Committee recommended
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changes in military and/or civilian maps to make them fit for purpose
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Outcome was that in 1892 |
the Treasury approved trial production of the one-inch military map in colour.
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But in 1893 it refused to |
fund trial production of the one-inch Ordnance Survey map in colour. |
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In 1897 the Treasury sanctioned the production by the Ordnance Survey of the new coloured |
Army map for sale to the public, i.e. it was not a map designed for civilian use. |
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In 1912, a new style was adopted, |
the “Popular” edition became the model for subsequent OS mapping in the 20th century |
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It was also the same style adopted by the Army for maps |
prepared in anticipation of the European War.
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Few new developments in ground survey
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as OS was still wedded to chain survey
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Air Surveying - Cons Cost effectiveness Weather conditions Dealing with civilian contractors |
Air Surveying - Pros
Supported plotter development Keen to support British instruments Found a route to make changes… |
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The Davidson Committee set up to
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Accelerate revision, update maps for towns planning schemes and review the scales and styles of the maps
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Important outcomes |
Adoption of a National projection,
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Maps should be recast on National not county sheet lines
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New 1:1250 scale for urban areas and 1:25,000 for all areas
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A National grid should be superimposed
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Grid to be based on the international metre
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Central meridians for county or group of counties |
39 meridians used
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Limited scale error
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Discontinuities at county boundaries
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Problems in digital era
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Digital data not supplied in a readily useable form
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Pricing policies did not reflect the evolving economics of the digital era
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Attempts to earn revenue led to competition with partners
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Mastermap to provide unique referencing system
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embrace GPS network
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national network of GPS stations
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create a ‘joined-up geography’
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development of the Digital National Framework (DNF)
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provision of unique digital identifier (TOID) for every significant feature in the landscape
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Enhanced attribute information
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On-line selection and purchase
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