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After 1854, the six-inch maps and their revisions were based on the twenty-five inch maps. The six-inch sheets covered an area of six by four miles on the ground; the twenty-five inch sheets an area of one by one and a half. One square inch on the twenty-five inch maps was roughly equal to an acre on the ground.
The original draftsman's drawings for the area around St Columb Major in Cornwall, made in 1810. Detail from 1901 Ordnance Survey map of the Imperial fortress colony of Bermuda (showing St. George's Town and St. George's Garrison), compiled from surveys carried out between 1897 and 1899 by Lieutenant Arthur Johnson Savage, Royal Engineers.
The Land Cover Map of Great Britain (1990) was the first comprehensive survey since the Second Land Use Survey. This used satellite imagery, with ground survey used for checking. [9] The end product is a digital dataset rather than paper mapping, providing classification of land cover types into 25 classes, at a 25m (or greater) resolution.
PDF file including history and map of the Irish part and its links to Britain; Information and Maps on many aspects of Triangulation (& Levelling) in Great Britain "History Section - Corps History". Royal Engineers Museum. Archived from the original on 2006-08-29 – via Archive.org. "Major General William ROY (1726-1790)". Royal Engineers Museum.
[6] [7] This survey at a scale of 1 inch to 1000 yards (1:36,000) [8] was the starting point of the Principal Triangulation of Great Britain (1783–1853), and led to the creation of the Ordnance Survey itself; work was begun in earnest in 1790, when the Board of Ordnance began a national military survey at one-inch-to-the-mile (1:63,360 scale ...
The Great Britain Historical GIS (or GBHGIS) is a spatially enabled database that documents and visualises the changing human geography of the British Isles, [1] although is primarily focussed on the subdivisions of the United Kingdom mainly over the 200 years since the first census in 1801.
GeoHive Mapviewer Archived 6 July 2020 at the Wayback Machine: select Data Catalogue>Base Information and Mapping>Historic Map [25 inch (1888–1913) / 6 inch (1837–1842)] for old Ordnance Survey of Ireland maps; Logainm.ie (Placenames Database of Ireland) search/browse by parish/barony/county, English and Irish names; Goblet, Yann M., ed ...
100km squares Grid square TF. The map shows The Wash and the North Sea, as well as places within the counties of Lincolnshire, Cambridgeshire and Norfolk.. The first letter of the British National Grid is derived from a larger set of 25 squares of size 500 km by 500 km, labelled A to Z, omitting one letter (I) (refer diagram below), previously used as a military grid. [4]