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questions :Define urban agglomeration
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[Visitor (111.8.*.*)]answers [Chinese ]Time :2020-03-15
The so-called city group is a large number of cities of different natures, types, and scales gathered in a specific area. Generally, one or two cities (with the exception of a few city groups being multi-core) are mega cities (small city groups are Large cities) as the center, relying on certain natural environment and traffic conditions, the internal links between cities are constantly strengthened, and together form a relatively complete city "collection".
Urban agglomerations are relatively independent collections of urban communities and the sum of the inter-city relationships of these cities. The size of urban agglomerations has a certain size, and each has its core city. Generally, it is a core city, some are two, and very few are three or four. .

Urban agglomerations (also known as urban belts, urban circles, urban agglomerations, or metropolitan areas, etc.) refer to the collection of cities that take the central city as the core and radiate to the surroundings. The characteristics of urban agglomerations are reflected in the close economic relations, industrial division of labor and cooperation, and the interaction between transportation and social life, urban planning and infrastructure construction. An economic circle can be formed by multiple city groups or a single large city group.
The Chinese "City Group" (urban circle) is a term commonly used in mainland China since the 1990s. It was used in the May 1994 edition of "Structural Theory" (Shanghai, Beijing Library, 1991-19 1993) "City Group" analyzes the sub-cultural circle urban network formed by the intersection of large river basins, lakes, and coasts, and proposes the upper, middle, and lower urban agglomerations of the Yangtze River and the Yellow River, the east-west coastline of the United States, the five lakes and Mississippi river basin, and Geo-Cultural Culture.In the past, the Japanese "metropolitan area" (metropolitan area) was directly used to express the same concept. The Japanese "metropolitan area" means the English Metropolitan Coordinating Region, and the Metropolitan Area in North America. The meaning of "up" and "urban circle" means the same or similar...
Urban agglomerations are formed during the process of urbanization, in a specific regional space with a high level of urbanization, by using regional network organizations as a link, and by densely distributed cities of different levels and their hinterlands through spatial interaction. City-region system. The emergence of urban agglomerations is the product of the development of productivity and the gradual optimization of the production factors. Each urban agglomeration is generally based on one or two (the exception is that a few urban agglomerations are multi-core). The central city with radiation-driven functions is the core, and is composed of a number of neighboring cities with close spatial distances, close economic ties, complementary functions, and orderly levels..The development of urban agglomerations can realize the optimal allocation of resources on a larger scale, enhance the role of radiation, and promote the development of cities within the urban agglomerations...
Scholars on the concept of urban agglomerations are not consistent, but the understanding is becoming more and more consistent, that is, urban agglomerations are composed of many cities, which are increasingly connected to each other, and together they have an impact on regional development. Urban agglomeration is an advanced phenomenon of regional spatial form in the process of industrialization and urbanization. It can produce huge agglomeration economic benefits and is one of the signs of rapid development of the national economy and continuous improvement of modernization.
From the origin of the concept, urban agglomerations have evolved from big cities. Gottman first named the urban agglomerations with Megalopolis, and more importantly: First, it surpassed the moral criticism of Megalopolis by urban sociology since the 19th century. Context and value attitude make possible an objective and rational research on urban agglomerations; secondly, it gives this concept a new qualitative connotation and significance, revealing the transformation and development of today's cities from traditional single cities to urban communities New model and new form. Furthermore, Megalopolis is not only a further extension of the traditional big city concept, but also a contemporary model and the latest form of human urban development. Its most prominent feature is that this new type of metropolis is no longer a single city. Is an urban community.In this regard, it can also be said that "metropolises are urban agglomerations"...

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