Roman Britain (Historical Map and Guide): 7

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There are two sets of air photographs. One is held at the National Collection of Aerial Photography (NCAP) in Scotland, and the second has been entrusted to Oxford University to support global climate change research. Ordnance Survey of Great Britain, shewing military districts. Sheet 1 (North), Sheet 2 (Central), Sheet 3 (South)

Three films showing DOS activities were transferred to the B ritish Film Institute's National Film and TV Archive. DVD copies of one of these films, a DOS training film, was supplied to all main repositories holding parts of the Ordnance Survey International Collection. Non-Directorate of Overseas Surveys mapping In 2002, Ordnance Survey deemed its International Library no longer needed for operational purposes. Responsibility for these public records then passed to The National Archives (TNA). Working with OS staff and advised by specialists, the material was appraised, and determined what would be kept, and where. Public access to the International Library in Ordnance Survey head office ceased in March 2003. In addition to contract photography, the collection occasionally holds cover obtained by the national survey departments, and other aid agencies such as the Canadian International Development Agency. The collection holds approximately 1.5 million monochrome, vertical aerial photographs. Each one is survey-standard and suitable for viewing stereoscopically in 3D. Most are at nominal scale 1:30 000 – 1:60 000 and in 230 mm by 230 mm format. Mostly panchromatic, though there are infrared, monochrome prints, off-colour, infra-red negatives, and a few colour prints. A guide to the areas mapped by DOS is included in the DOS Annual Reports from 1951 to 1984; later maps (1967 onwards) indicate areas where there is both pre- and post-1960 mapping. Sheet indices exist for most series.The final steps used concrete, which the Romans had rediscovered (it had been used in Ancient Egypt). They seem to have mixed the mortar and the stones in the fossa. First a small layer of coarse concrete, the rudus, then a little layer of fine concrete, the nucleus, went onto the pavement or statumen. Into or onto the nucleus went a course of polygonal or square paving stones, called the summa crusta. The crusta was crowned for drainage. Other agencies’ editions in series produced jointly by DOS, national mapping agencies and British Military Survey A basic scale used on former British territories was 1:50 000. Smaller scales were used in arid lands such as British Somaliland (1:125 000) and parts of Botswana (1:125 000, later 1:100 000). Larger scales (1:25 000) in Mediterranean and Caribbean islands. "Selected" areas, and sometimes whole islands (Malta, Gozo, Bermuda), were mapped at 1:2500 scale (occasionally 1:5000, 1:2400, 1:1200) and, rarely, at 1:500 scale (Male, Stanley). You can see this functionality in action if you choose one of the One Inch layers from the 1950s-70s.

The DOS maps from the collection have been re-located to RGS-IBG, which now holds a complete set designated as The Ordnance Survey International Collection (OSIC) Map Archive. The National Archives The example map sheets are held with full supporting records. Directorate of Overseas Surveys staff lists HereWeGo is not the best known, but provides both mapping and recent aerial photo coverage. The layers control to access the aerial imagery is in the bottom right corner of the screen Lecture & Seminar SeriesBetween 1946 and the late 1980s, Directorate of Overseas Surveys (DOS) field parties worked towards establishing ground control (planimetric and height) for mapping, observing national primary and secondary survey frameworks, and assisting with tertiary and cadastral control and levelling. The collection includes results of control surveys by other organisations, some connected to DOS schemes and most used by DOS in its mapping programmes. Ordnance Survey already had its own international division. When the two organisations were merged in 1984, all international aerial photographs, maps, and survey data were amalgamated into one working collection. It was named Technical Information and Support Services and kept that title for seven years, before being renamed International Library in 1991. Great Britain 1:1,000,000 (in the style of the International 1/1M. map) With the National Grid. Sheet 1 (North), Sheet 2 (South)