Urban structure is the arrangement of land use in urban areas, in other words, how the land use of a city is set out. [1] Urban planners, economists, and geographers have developed several models that explain where different types of people and businesses tend to exist within the urban setting. Urban structure can also refer to urban spatial structure, which concerns the arrangement of public and private space in cities and the degree of connectivity and accessibility.
This model was the first to explain distribution of social groups within urban areas. Based on one single city, Chicago, it was created by sociologist Ernest Burgess [2] in 1924. According to this model, a city grows outward from a central point in a series of concentric rings. The innermost ring represents the central business district. It is surrounded by a second ring, the zone of transition, which contains industry and poorer-quality housing. The third ring contains housing for the working-class and is called the zone of independent workers' homes. The fourth ring has newer and larger houses usually occupied by the middle-class. This ring is called the zone of better residences. The outermost ring is called the commuter's zone. This zone represents people who choose to live in residential suburbs and take a daily commute into the CBD to work.
A second theory of urban structure was proposed in 1939 by an economist named Homer Hoyt. [3] His model, the sector model, proposed that a city develops in sectors instead of rings. Certain areas of a city are more attractive for various activities, whether by chance or geographic and environmental reasons. As the city grows and these activities flourish and expand outward, they do so in a wedge and become a sector of the city. If a district is set up for high income housing, for example, any new development in that district will expand from the outer edge.
To some degree this theory is just a refinement on the concentric model rather than a radical restatement. Both Hoyt and Burgess claimed Chicago supported their model. Burgess claimed that Chicago's central business district was surrounded by a series of rings, broken only by Lake Michigan. Hoyt argued that the best housing developed north from the central business district along Lake Michigan, while industry located along major rail lines and roads to the south, southwest, and northwest.
Calgary, Alberta almost perfectly fits Hoyt's sector model.
Geographers Chauncy Harris and Edward Ullman developed the multiple nuclei model in 1945. [4] According to this model, a city contains more than one center around which activities revolve. Some activities are attracted to particular nodes while others try to avoid them. For example, a university node may attract well-educated residents, pizzerias, and bookstores, whereas an airport may attract hotels and warehouses. Other businesses may also form clusters, sometimes known locally as Iron Triangles for automobile repair or red light districts for prostitution, or arts districts. Incompatible activities will avoid clustering in the same area, explaining why heavy industry and high-income housing rarely exist in the same neighbourhood.
Lilongwe is the capital and most populated city of the African country of Malawi. It has a population of 989,318 as of the 2018 Census, up from a population of 674,448 in 2008. In 2020 that figure was 1,122,000. The city is located in the central region of Malawi, in the district of the same name, near the borders with Mozambique and Zambia, and it is an important economic and transportation hub for central Malawi. It is named after the Lilongwe River.
Economic geography is the subfield of human geography which studies economic activity and factors affecting them. It can also be considered a subfield or method in economics. There are four branches of economic geography.
Urban sociology is the sociological study of cities and urban life. One of the field’s oldest sub-disciplines, urban sociology studies and examines the social, historical, political, cultural, economic, and environmental forces that have shaped urban environments. Like most areas of sociology, urban sociologists use statistical analysis, observation, archival research, U.S. census data, social theory, interviews, and other methods to study a range of topics, including poverty, racial residential segregation, economic development, migration and demographic trends, gentrification, homelessness, blight and crime, urban decline, and neighborhood changes and revitalization. Urban sociological analysis provides critical insights that shape and guide urban planning and policy-making.
The Chicago school refers to a school of thought in sociology and criminology originating at the University of Chicago whose work was influential in the early 20th century.
Urban economics is broadly the economic study of urban areas; as such, it involves using the tools of economics to analyze urban issues such as crime, education, public transit, housing, and local government finance. More specifically, it is a branch of microeconomics that studies the urban spatial structure and the location of households and firms.
The concentric zone model, also known as the Burgess model or the CCD model, is one of the earliest theoretical models to explain urban social structures. It was created by sociologist Ernest Burgess in 1925.
The sector model, also known as the Hoyt model, is a model of urban land use proposed in 1939 by land economist Homer Hoyt. It is a modification of the concentric zone model of city development. The benefits of the application of this model include the fact it allows for an outward progression of growth. As with all simple models of such complex phenomena, its validity is limited.
The multiple nuclei model is an economical model created by Chauncy Harris and Edward Ullman in the 1945 article "The Nature of Cities".
Urban morphology is the study of the formation of human settlements and the process of their formation and transformation. The study seeks to understand the spatial structure and character of a metropolitan area, city, town or village by examining the patterns of its component parts and the ownership or control and occupation. Typically, analysis of physical form focuses on street pattern, lot pattern and building pattern, sometimes referred to collectively as urban grain. Analysis of specific settlements is usually undertaken using cartographic sources and the process of development is deduced from comparison of historic maps.
Ernest Watson Burgess was a Canadian-American urban sociologist born in Tilbury, Ontario. He was educated at Kingfisher College in Oklahoma and continued graduate studies in sociology at the University of Chicago. In 1916, he returned to the University of Chicago, as a faculty member. Burgess was hired as an urban sociologist at the University of Chicago. Burgess also served as the 24th President of the American Sociological Association (ASA).
In sociology, the social disorganization theory is a theory developed by the Chicago School, related to ecological theories. The theory directly links crime rates to neighbourhood ecological characteristics; a core principle of social disorganization theory that states location matters. In other words, a person's residential location is a substantial factor shaping the likelihood that that person will become involved in illegal activities. The theory suggests that, among determinants of a person's later illegal activity, residential location is as significant as or more significant than the person's individual characteristics. For example, the theory suggests that youths from disadvantaged neighborhoods participate in a subculture which approves of delinquency, and that these youths thus acquire criminality in this social and cultural setting.
Homer Hoyt was an American economist known for his pioneering work in land use planning, zoning, and real estate economics. He conducted notable research on land economics and developed an influential approach to the analysis of neighborhoods and housing markets. His sector model of land use was influential in urban planning for several decades. His legacy is controversial today, due to his prominent role in the development and justification of racially segregated housing policy and redlining in American cities.
The bid rent theory is a geographical economic theory that refers to how the price and demand for real estate change as the distance from the central business district (CBD) increases. It states that different land users will compete with one another for land close to the city centre. This is based upon the idea that retail establishments wish to maximize their profitability, so they are much more willing to pay more for land close to the CBD and less for land further away from this area. This theory is based upon the reasoning that the more accessible an area, the more profitable.
Activity centre is a term used in urban planning and design for a mixed-use urban area where there is a concentration of commercial and other land uses. For example, the central business districts of cities (CBD) are also known as “Central Activities Districts” (CAD) (also known as Downtown in North America or "Central Activities Zone" in the United Kingdom in recognition of the fact that commercial functions are not the only things that occur there. The term activity centre can also be used to designate an area for mixed-use development, whatever its current land use happens to be.
Zone of transition is the area between the factory zone and the working-class zone in the concentric zone model of urban structure devised by Ernest Burgess. The zone of transition is an area of flux where the land use begins to change.
The Core frame model is a model showing the urban structure of the Central Business District of a town or city. The model was first suggested by Ronald R. Boyce and Edgar M. Horwood in 1959.
Chauncy Dennison Harris was a pioneer of modern geography. His seminal works in the field of American urban geography along with his work on the Soviet Union during and after the Cold War era established him as one of the world's foremost urban geographers. He also made significant contributions to the geographical study of ethnicity, specifically with respect to non-Russian minorities living within the Soviet Union. Harris traveled regularly to the Soviet Union and played a key role in establishing a healthy dialog between Soviet and American scholars.
Innovation districts are urban geographies of innovation where R&D strong institutions, companies, and other private actors develop integrated strategies and solutions to develop thriving innovation ecosystems–areas that attract entrepreneurs, startups, and business incubators. Unlike science parks, innovation districts are physically compact, leverage density and high levels of accessibility, and provide a “mash up” of activities including housing, office, and neighborhood-serving amenities. Districts signify the collapse back of innovation into cities and is increasingly used as a way to revitalize the economies of cities and their broader regions. As of 2019, there are more than 100 districts worldwide.
The City is a book by American urban sociologists Robert E. Park and Ernest W. Burgess published in 1925.
Morphology in architecture is the study of the evolution of form within the built environment. Often used in reference to a particular vernacular language of building, this concept describes changes in the formal syntax of buildings and cities as their relationship to people evolves and changes. Often morphology describes processes, such as in the evolution of a design concept from first conception to production, but can also be understood as the categorical study in the change of buildings and their use from a historical perspective. Similar to genres of music, morphology concertizes 'movements' and arrives at definitions of architectural 'styles' or typologies. Paradoxically morphology can also be understood to be the qualities of a built space which are style-less or irreducible in quality.