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A metropolitan area, sometimes referred to as a metropolitan region, metro area or just metro, is a region consisting of a densely populated urban core and its less-populated surrounding territories, sharing: industry, infrastructure, and housing.〔Squires, G. Ed. Urban Sprawl: Causes, Consequences, & Policy Responses. The Urban Institute Press (2002)〕 A metro area usually comprises multiple jurisdictions and municipalities: neighborhoods, townships, cities, exurbs, counties, districts, states, and even nations like the eurodistricts. As social, economic and political institutions have changed, metropolitan areas have become key economic and political regions.〔Mark, M., Katz, B., Rahman, S., and Warren, D. MetroPolicy: Shaping A New Federal Partnership for a Metropolitan Nation. Brookings Institution: Metropolitan Policy Program Report. (2008). 4-103.〕 Metropolitan areas include one or more urban areas, as well as satellite cities, towns and intervening rural areas that are socio-economically tied to the urban core, typically measured by commuting patterns.〔(【引用サイトリンク】url=http://demographia.com/db-define.pdf )〕 For urban centres outside metropolitan areas, that generate a similar attraction at smaller scale for their region, the concept of the regiopolis and respectively ''regiopolitan area'' or ''regio'' was introduced by German professors in 2006.〔Prof. Dr. Iris Reuther (FG Stadt- und Regionalplanung, Universität Kassel): Presentation "Regiopole Rostock". 11 December 2008, retrieved 13 June 2009 (pdf).〕 ==General definition== A metropolitan area combines an urban agglomeration (the contiguous, built-up area) with zones not necessarily urban in character, but closely bound to the center by employment or other commerce. These outlying zones are sometimes known as a commuter belt, and may extend well beyond the urban zone, to other political entities. For example, El Monte, California is considered part of the Los Angeles' metro area in the United States. In practice, the parameters of metropolitan areas, in both official and unofficial usage, are not consistent. Sometimes they are little different from an urban area, and in other cases they cover broad regions that have little relation to a single urban settlement; comparative statistics for metropolitan area should take this into account. Population figures given for one metro area can vary by millions. There has been no significant change in the basic concept of metropolitan areas since its adoption in 1950,〔(Census.gov )〕 although significant changes in geographic distributions have occurred since then, and more are expected.〔(Whitehouse.gov )〕 Because of the fluidity of the term "metropolitan statistical area," the term used colloquially is more often "metro service area," "metro area," or "MSA" taken to include not only a city, but also surrounding suburban, exurban and sometimes rural areas, all which it is presumed to influence. A polycentric metropolitan area is one not connected by continuous development or conurbation, which requires urban contiguity. In defining a metropolitan area, it is sufficient that a city or cities form a nucleus that other areas have a high degree of integration with. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Metropolitan area」の詳細全文を読む スポンサード リンク
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