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Cassini Grid
The Cassini Grid was a grid coordinate system used on British military maps during the first half of the twentieth century, particularly during World War II. The referencing consists of square grids drawn on a Cassini projection. For a period after the war, the maps were also used by the general public. The system has been superseded by the Ordnance Survey National Grid.
==History==
The Cassini Grid system was introduced in 1927 for maps of the United Kingdom for the British military. It is so called from the use of Cassini map projection. It modified and replaced a grid coordinate system first deployed in 1919 known as the ''British System''. The Cassini Grid system is thus more properly called the Modified British System. It may also be referred to as Military Grid, War Office Grid, or Purple Grid (due to the grid colour on some issues of maps). It continued in use until some time after World War II.〔The Defence of East Sussex Project, (Military Maps ), accessed and (archived ) 27 September 2015.〕
After the war, the Cassini Grid system was replaced with the Ordnance Survey National Grid (see ). However, the Cassini Grid system continued to be used to map colonial possessions into the 1960s. Hong Kong, for instance, was surveyed in 1962 for a series of 1:10,000 and 1:25,000 maps of the territory. These were published between 1965 and 1972.〔R. Böhme, R. W. Anson, ''Eastern Europe, Asia, Oceania and Antarctica'', p. 138, Elsevier, 2013 ISBN 1483292657.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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