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In 2013 the United Kingdom's Office for National Statistics (ONS) published 2011 Built-up Areas – Methodology and Guidance which sets out its definition of a Built-up area (BUA) as an area of built-up land of at least 20 hectares (0.077 sq mi), separated from other settlements by at least 200 metres (660 ft).
the definition follows a ‘bricks and mortar’ approach, with areas defined as built-up land with a minimum area of 20 hectares (200,000 m 2), while settlements within 200 metres of each other are linked. Built-up area sub-divisions are also identified to provide greater detail in the data, especially in the larger conurbations. [1]
Back in 2001, the ONS had a logical approach (see Milton Keynes urban area#Built-up area sub-divisions) but as the city developed, they lost the plot. They could have defined BUASDs defined by the A5, A421, A422 and the flood plain of the River Ouzel. But now they have painted themselves into a corner and hoping that the OS will dig them out of it.
An urban area can be defined by one or more of the following: administrative criteria or political boundaries (e.g., area within the jurisdiction of a municipality or town committee), a threshold population size (where the minimum for an urban settlement is typically in the region of 2,000 people, although this varies globally between 200 and ...
Example of a potential urban infill site. In the urban planning and development industries, infill has been defined as the use of land within a built-up area for further construction, especially as part of a community redevelopment or growth management program or as part of smart growth. [6] [7]
For example, many pre-industrial cores of cities in Europe, Asia, and the Middle East tend to have irregularly shaped street patterns and urban blocks, while cities based on grids have much more regular arrangements. By extension, the word "block" is an important informal unit of length equal to the distance between two streets of a street grid.
Built-up area boundaries are defined and named by the ONS. (In ONS reports of the 2011 and 2021 censuses, many of these areas were called "built-up sub-areas" of larger urban areas ; as of October 2024 [update] , the ONS has not defined a new nomenclature for the urban areas or released any data for them.)
Measures for urban sprawl in Europe: upper left the Dispersion of the built-up area (DIS), upper right the weighted urban proliferation (WUP). The term urban sprawl was often used in the letters between Lewis Mumford and Frederic J. Osborn, [17] firstly by Osborn in his 1941 letter to Mumford and later by Mumford, generally condemning the waste of agricultural land and landscape due to ...