Urbanized Area

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Cities with at least a million inhabitants in 2006
An urban area is an area with an increased density of human-created structures in comparison to the areas surrounding it. This term is at one end of the spectrum of suburban and rural areas. An urban area is more frequently called a city or town.

Urban areas are created and further developed by the process of urbanization. Measuring the extent of an urbanized area helps in analyzing population density and urban sprawl, and in determining urban and rural populations(Cubillas 2007).

Unlike an urban area, a metropolitan area includes not only the urban area, but also satellite cities plus intervening rural land that is socio-economically connected to the urban core city, typically by employment ties through commuting, with the urban core city being the primary labor market. This makes metropolitan areas a less relevant statistic for determining per capita land usage and densities(Dumlao & Felizmenio 1976).

Definitions

Definitions vary somewhat amongst different nations. The minimum density requirement is generally 400 persons per square kilometer. In Australia, urban areas are referred to as "urban centres" and are defined as population clusters of 1000 or more people, with a density of 200 or more persons per square kilometre.[1] In Japan urbanized areas are defined as contiguous areas of densely inhabited districts (DIDs) using census enumeration districts as units with a density requirement of 4,000 people per square kilometer. European countries define urbanized areas on the basis of urban-type land use, not allowing any gaps of typically more than 200 meters, and use satellite photos instead of census blocks to determine the boundaries of the urban area. In less developed countries, in addition to land use and density requirements, a requirement that a large majority of the population, typically 75%, is not engaged in agriculture and/or fishing is sometimes used. Statistics New Zealand defines New Zealand urban areas for statistical purposes as a settlement with a population of a thousand people or more.

Canada

In Canada, an urban area is an area that has more than 400 people per square kilometre and has more than 1,000 people. If two or more urban areas are within two kilometres of each other, they are merged into a single urban area. The boundaries of an urban area are not influenced by municipal or even provincial boundaries.[2]

France

In France, an urban area is a zone (aire urbaine) encompassing an area of built-up growth (called an "urban unit" (unité urbaine)[3] - close in definition to the North American urban area) and its commuter belt (couronne périurbaine). Although the official INSEE translation of aire urbaine is "urban area"[4], most North Americans would find the same as being similar in definition to their metropolitan area.

United States

In the United States there are two categories of urban area. The term urbanized area denotes an urban area of 50,000 or more people. Urban areas under 50,000 people are called urban clusters. Urbanized areas were first delineated in the United States in the 1950 census, while urban clusters were added in the 2000 census. There are 1371 United States Urban Areas & Urban Clusters with more than 10,000 people.

The US Census Bureau defines an urban area as: "Core census block groups or blocks that have a population density of at least 1,000 people per square mile (386 per square kilometer) and surrounding census blocks that have an overall density of at least 500 people per square mile (193 per square kilometer)."

The concept of Urbanized Areas as defined by the US Census Bureau are often used as a more accurate gauge of the size of a city, since in different cities and states the lines between city borders and the urbanized area of that city are often not the same. For example, the city of Greenville, South Carolina has a city population under 60,000 but an urbanized area over 300,000, while Greensboro, North Carolina has a city population over 200,000 but an urbanized area population of around 270,000--meaning that Greenville is actually "larger" for some intents and purposes, but not for others, such as taxation, local elections, etc.

See also

References

External links

Population density is a measurement of population per unit area or unit volume. It is frequently applied to living organisms, humans in particular.

Biological population densities


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Suburbs are commonly defined as residential areas on the outskirts of a city or large town.[1] Most modern suburbs are commuter towns with many single-family homes.
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Rural areas (also referred to as "the country", countryside) are sparsely settled places away from the influence of large cities. Such areas are distinct from more intensively settled urban and suburban areas, and also from unsettled lands such as outback, American Old West
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city is an urban settlement with a particularly important status which differentiates it from a town.

City is primarily used to designate an urban settlement with a large population. However, city may also indicate a special administrative, legal, or historical status.
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town is a community of people ranging from a few hundred to several thousands, although it may be applied loosely even to huge metropolitan areas. Usually, a "town" is thought of as larger than a village but smaller than a "city".
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Urbanization or Urbanisation (see difference in spelling) means the removal of the rural characteristics of a town or area, a process associated with the development of civilisation.
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Population density is a measurement of population per unit area or unit volume. It is frequently applied to living organisms, humans in particular.

Biological population densities


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Urban sprawl, also known as suburban sprawl, is the spreading out of a city and its suburbs over rural land at the fringe of an urban area.[1] Residents of sprawling neighborhoods tend to live in single-family homes and commute by automobile to work.
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metropolitan area is a large population centre consisting of a large metropolis and its adjacent zone of influence, or of more than one closely adjoining neighboring central cities and their zone of influence.
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Satellite City redirects here. For the television show see: Satellite City (sitcom)


A satellite town or satellite city is a concept of urban planning, although many satellite cities and towns appeared spontaneously near many
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Rural areas (also referred to as "the country", countryside) are sparsely settled places away from the influence of large cities. Such areas are distinct from more intensively settled urban and suburban areas, and also from unsettled lands such as outback, American Old West
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Employment is a contract between two parties, one being the employer and the other being the employee. An employee may be defined as: "A person in the service of another under any contract of hire, express or implied, oral or written, where the employer has
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Commuting is the process of travelling between a place of residence and a place of work. Students who are enrolled at a college or university but who live off-campus are also typically referred to as commuters; such institutions having few dormitories are called
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A census is the process of obtaining information about every member of a population (not necessarily a human population). The term is mostly used in connection with national 'population and housing censuses' (to be taken every 10 years according to United Nations recommendations);
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Europe is one of the seven traditional continents of the Earth. Physically and geologically, Europe is the westernmost peninsula of Eurasia, west of Asia. Europe is bounded to the north by the Arctic Ocean, to the west by the Atlantic Ocean, to the south by the Mediterranean Sea,
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'Land use' is also often used to refer to the distinct land use types in Zoning.

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Satellite imagery consists of photographs of Earth or other planets made from artificial satellites.

History

The first satellite photographs of Earth were made August 14, 1959 by the US satellite Explorer 6.
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Statistics New Zealand (In Māori, Tatauranga Aotearoa) is the state sector organisation of New Zealand which is responsible for the country's official statistics, under the authority of the 1975 Statistics Act.
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Statistics New Zealand defines New Zealand urban areas for statistical purposes. The urban areas comprise cities, towns and other 'conurbations' (an aggregation or continuous network of urban communities) of a thousand people or more.
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The aire urbaine (not to be confused with English "urban area") is an INSEE (the national statistics office of France) statistical region comprising a couronne périurbaine commuter belt around a contiguous pôle urbain (urban area) urban core.
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In France an unité urbaine (literally: "urban unit") is a statistical area defined by INSEE, the French national statistics office, for the measurement of contiguously built-up areas.
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INSEE (French: Institut National de la Statistique et des Études Économiques; pronounced [in.se]) is the French National Institute for Statistics and Economic Studies.
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The aire urbaine (not to be confused with English "urban area") is an INSEE (the national statistics office of France) statistical region comprising a couronne périurbaine commuter belt around a contiguous pôle urbain (urban area) urban core.
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metropolitan area is a large population centre consisting of a large metropolis and its adjacent zone of influence, or of more than one closely adjoining neighboring central cities and their zone of influence.
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"E Pluribus Unum"   ("From Many, One"; Latin, traditional)
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Urban areas in the United States are defined by the U.S. Census Bureau as contiguous census block groups with a population density of at least 1,000 per square mile (about 400 per square km). Urban areas are delineated without regard to political boundaries.
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A census block is the smallest geographic unit used by the United States Census Bureau for tabulation of 100-percent data (data collected from all houses, rather than a sample of houses). Several blocks make up block groups, which again make up census tracts.
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