- published: 22 Oct 2011
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Eurostat, the European Union's statistical agency, has created the concept of Larger Urban Zone (LUZ) in an effort to harmonise definitions of urbanisation in the European Union and in countries outside the European Union. These definitions were agreed between Eurostat and the National Statistics Offices of the different countries of the European Union at the European Commission's Urban Audit of 2004. LUZs have been criticised for their insufficient harmonisation of data, which are still collected by national governments within local administrative units, making it sometimes difficult to compare LUZs from different countries. In 2006, about a third of the LUZ definitions were changed, significantly improving the comparability of LUZ definitions across different countries. Several cities, such as Marseille, Lille and Nice, are excluded by definition from the list of LUZs on technical, definitional grounds, such as the coincidence of the metropolitan area with the urban zone.
The latest round of the Urban Audit also added cities from candidate countries and EFTA countries.
An urban area is characterized by higher population density and vast human features in comparison to areas surrounding it. Urban areas may be cities, towns or conurbations, but the term is not commonly extended to rural settlements such as villages and hamlets.
Urban areas are created and further developed by the process of urbanization. Measuring the extent of an urban area helps in analyzing population density and urban sprawl, and in determining urban and rural populations.[citation needed]
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. In fact, urbanized areas agglomerate and grow as the core population/economic activity center within a larger metropolitan area or envelope.
In the US, Metropolitan areas tend to be defined using counties or county sized political units as building blocks of much larger, albeit more condensed population units. Counties tend to be stable political boundaries; economists prefer to work with economic and social statistics based on metropolitan areas. Urbanized areas are a more relevant statistic for determining per capita land usage and densities.[citation needed]