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・ Ringdroid
・ Ringe
・ Ringe Municipality
・ Ring of Pietroassa
・ Ring of polynomial functions
・ Ring of quotients
・ Ring of Red
・ Ring of Saturn
・ Ring of Scorpio
・ Ring of sets
・ Ring of Silvianus
・ Ring of Spies
・ Ring of steel
・ Ring of Steel (film)
・ Ring of Steel (Kabul)
Ring of steel (London)
・ Ring of Stone
・ Ring of Stones
・ Ring of Sweden
・ Ring of symmetric functions
・ Ring of Terror
・ Ring of the Fisherman
・ Ring of the Nibelungs
・ Ring of Time
・ Ring of Truth (band)
・ Ring Off (song)
・ Ring oiler
・ Ring on Her Finger, Time on Her Hands
・ Ring oscillator
・ Ring Out Bow Bells!


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Ring of steel (London) : ウィキペディア英語版
Ring of steel (London)

The ring of steel is the popular name for the security and surveillance cordon consisting of several hundred CCTV cameras surrounding the City of London, the financial district at the heart of Greater London. The measures were installed in the 1990s to deter terrorism and other threats.〔City of London Police. "3.2.4 The automated number plate recognition (ANPR) system and the Corporation of London’s traffic and environment zone culminate in what is generally referred to and known as the ‘ring of steel’.〕〔BBC News (2003-12-08)〕
== Number of cameras ==
According to a 2011 Freedom of Information Act request, the total number of local government operated CCTV cameras in the City of London was 649.
The number of surveillance cameras that are part of the ring of steel is often wrongly quoted as 500,000.〔See, for example, ; ; ; 〕 This figure relates to Greater London, which has an area of 1,572 square km compared with the 3 square km of the City of London that the ring of steel covers. Furthermore, it has been acknowledged for several years that the methodology behind this figure is flawed, but it has been widely quoted.〔See, for example, 〕
The figure of 500,000 comes from a study by Michael McCahill and Clive Norris of UrbanEye published in 2002.〔(【引用サイトリンク】title=CCTV in London )〕 Based on a small sample in Putney High Street, McCahill and Norris extrapolate the number of surveillance cameras in Greater London to be 500,000 and in the United Kingdom to be 4.2 million. More reliable estimates put the total number of private and local government surveillance cameras in the whole of the United Kingdom at around 1.85 million in 2011.

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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