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Roman Britain (Historical Map and Guide): 7

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The International Collection was the result of the work of the Directorate of Colonial Surveys, the Directorate of Overseas Surveys, Ordnance Survey (Overseas Surveys Directorate) and Ordnance Survey International. The history of the International Collection You can see this functionality in action if you choose one of the One Inch layers from the 1950s-70s. In difficult cases DOS would study the evolution of the boundary over many decades, then write a critique explaining how the boundary alignment was transferred from official documents to the DOS map. One example would be the former Yemen Arab Republic-People’s Democratic Republic of Yemen boundary. Directorate of Overseas Surveys map production example set Individual trig stations and occasional bench marks are plotted, with heights, on DOS 1:125 000 and larger-scale mapping. International boundary survey data Into the fossa was dumped large amounts of rubble, gravel and stone, whatever fill was available. Sometimes a layer of sand was put down, if it could be found. When it came to within 1 yd (1 m) or so of the surface it was covered with gravel and tamped down, a process called pavire, or pavimentare. The flat surface was then the pavimentum. It could be used as the road, or additional layers could be constructed. A statumen or "foundation" of flat stones set in cement might support the additional layers.

They're filed under code AD rather than by individual country. Directorate of Overseas Surveys survey data catalogue The Roman roads in Britain were, with Roman aqueducts, and the Roman army, [1] one of the most impressive features of the Roman Empire in Britain. 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. A small-scale guide to this photography is included in the DOS Annual Reports from 1951 to 1984, to be held by The National Archives (TNA). Other photography in the collection is shown on non-DOS cover diagrams or sortie plots produced by the originator of the photography. Summary diagrams for each country illustrate the location of all photography. The principal points of photos used in the mapping are shown and numbered on almost all DOS 1:50 000–1:125 000 scale topographic maps and provide accurate indications of the location of individual photos. Air photo mosaics and print laydowns (uncontrolled mosaics produced as map substitutes on standard sheetlines in advance of the regular mapping) are archived at the National Collection of Aerial Photography.

30th Meridian triangulation in Africa

The Directorate of Overseas Surveys (DOS) book collection was merged with the Ordnance Survey Library’s collection in 1987. It has since been withdrawn from the library and has relocated to other institutions under the direction of the National Archives. 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 directions for making pavements given by Vitruvius. The pavement and the via munita were identical in construction, except as regards the top layer.

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). 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 Archiveslisted chronologically)• ca. 1852? - Diagram shewing the principal triangulation for the Ordnance Survey of Great Britain and Ireland. The Directorate of Overseas Surveys (DOS) survey data catalogue is stored in 49 Kalamazoo binders. The master control diagrams (MCDs), generally at 1:500 000 scale, show the position and classification of every astronomical, trigonometrical or Doppler station for which coordinates suitable for 1:50 000 scale mapping are held. Master trig diagrams (MTDs) on the same sheetlines and scale show the observed rays used to fix the trig stations. During 2003 and 2004, Ordnance Survey and TNA sought suitable custodians of all parts of the collection and relocated them. The public could access the historical archives again from the end of 2004. Where are the International Collection archives now?

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